An analytical model was developed and applied to a hypothetical criticality excursion in a freezer/sublimer of UF{sub 6}. Gaseous diffusion plants store UF{sub 6}. Neutronic calculations have shown that a critical configuration can occur if water accidentally enters the system, although the possibility of this ocurrence is highly unlikely.

Analysis of a criticality accident scenario occuring in a simple fast metal system using the coupled neutronic-hydrodynamic method is demonstrated by examining the last Godiva-I criticality accident. The basis tools and information for creating a coupled neutronic-hydrodynamic code are presented. Simplifying assumptions and ...

The Kukla assembly is a bare spherical oralloy assembly capable of producing self-limiting prompt critical fission bursts. Design and theory of operation are to a large extent based on the Godiva assemblies. The assembly was constructed to meet specific physics experimental requirements at the Lawrence Radiation Laboratory, Livermore. It is expected that the assembly will also find ...

On April 26, 1986, an accident occurred at the Chernobyl-4 Nuclear Power Plant in the Soviet Union. A post accident meeting was held in Vienna during the week of August 25, 1986. In mid-July 1986, the DOE formed a team to analyze the accident, including experts from the national laboratories such as Argonne ...

In a loss-of-flow (LOF) accident in a liquid-metal fast breeder reactor, the mode of disruption of fuel may determine the probability of a subsequent energetic excursion. To investigate these phenomena, in pile disruption of fission-heated irradiated fuel pellets was recorded by high-speed cinematography. Instead of fuel frothing or dust cloud breakup (as ...

This report describes an accident that occurred on December 20, 2008, about 1818 mountain standard time, in which Continental Airlines flight 1404, a Boeing 737-500, N18611, departed the left side of runway 34R during takeoff from Denver International Air...

Personal radiation detection instruments (PRDIs) are often used to augment the protection provided by the installed criticality accident alarm system (CAAS). ANSI/ANS-8.3-1997 provides examples of situations when PRDIs could be used, including {hor{underscore}ellipsis}alarm system maintenance or testing, evacuation drills, activities in areas not normally occupied by ...

A power limit criterion was developed for a postulated Loss of Pumping Accident (LOPA) in one of the recently shut down heavy water production reactors at the Savannah River Site. These reactors were cooled by recirculating moderator downward through channels in cylindrical fuel tubes. Powers were limited to prevent a flow excursion from ...

A power limit criterion was developed for a postulated Loss of Pumping Accident (LOPA) in one of the recently shut down heavy water production reactors at the Savannah River Site. These reactors were cooled by recirculating heavy water moderator downward through channels in cylindrical fuel tubes. Powers were limited to safeguard against a flow excursion ...

A pressurized water reactor (PWR) with a positive moderator temperature coefficient of reactivity is potentially susceptible to a severe overheating transient. This study identifies a scenario in which such a transient could occur and is similar in some respects to the accident at Chernobyl Unit 4. The scenario so identified is a natural circulation test ...

The patients exposed to irradiation in the Y-12 accident were studied and followed at the ORINS Medical Division Hospital. The five patients with the higher dose levels were kept in the hospital for several weeks following exposure. Epilation began on the seventeenth day. Minimal clinical signs of a hemorrhagic tendency were seen around the twenty-fifth to thirtieth ...

A method for the safe handling of the SNAP-III thermoelectric generators is presented. It provides information regarding shipping regulations, general handling instructions for packing, unpacking, and demonstrating the device, and procedures to follow in an event of an accident. Possible hszards involved in handling the device, and the probability of any of these ...

A Criticality Alarm System is normally designed to detect immediately the minimum accident of concern. This report covers the methodology to establish a different minimum accident of concern developed for shielded facilities and applied to a case of the canyon sump excursion in a Savannah River Site facility.

On Saturday morning, April 7, 1962, at about 1059 Armed Forces time, an accidental nuclear excursion occurred in the plutonium waste recovery facility (Recuplex) of the 234-5 Building. This excursion did not result in any mechanical damage or spread of contamination. Three employees of the General Electric Company received ...

Work was carried out to obtain significant data on reactor excursions, in particular the SL-1 excursion, to extend the analysis of reactor transient behavior so as to obtain an improved understanding of the thermal and mechanical processes that take place during and following a reactor excursion, and to obtain chemical, ...

Anticipated transients without scram (ATWS) events have received considerable attention in the past and are still a subject of great interest in severe-accident analysis. Of special interest is the effect of the low-pressure emergency core cooling system (ECCS) on the plant response following a blowdown by the automatic depressurization system (ADS). There is a potential for ...

The April 7, 1962 criticality accident involving human exposures was the first to have occurred in any production facility at Hanford. The accidental nuclear excursion did not result in any mechanical damage or spread of contamination. Three employees received over-exposure to gamma and neutron radiation. None were fatally exposed and ...

Estimates activity release from coated particles and heavy metal contamination in MHTGR cores due to thermal transients.

In a loss-of-flow (LOF) accident in an LMFBR, the mode and timescale of disruption of fuel can establish the probability of a subsequent energetic excursion. To investigate these phenomena, in-pile disruption of internal-fission-heated fuel pellets, both fresh UO/sub 2/ and preirradiated mixed oxide, was recorded by high speed cinematography. Neither fuel ...

An analysis of fuel rod behavior during reactivity initiated accidents is presented. The calculational approach is described, predictions are discussed and compared to data from the SPERT power excursion tests, and the sensitivity of maximum cladding temp...

Among the many known types of vapor-liquid flow instability is the excursion which may occur in heated parallel channels. Under certain conditions, the pressure drop requirement in a heated channel may increase with decreases in flow rate. This leads to an excursive reduction in flow. For channels heated by electricity or nuclear ...

... craft accidents (ie, Accident Data- ... involved in civil aviation aircraft acci- ... There were 12,883 aviation accidents that occurred during the study period. ...

in aircraft or rail accidents, the sheer number of road accidents occurring in a ... their total costs usually outstrip those from accidents in other modes. ...

Boys are involved in more motor vehicle accidents than are girls. Nighttime accidents account for relatively few accidents. However, severity of accident is increased at dark. A different type of accident occurs when the bicycle is used as a toy or as a m...

The US Department of Energy's High Flux Isotope Reactor (HFIR) was analyzed to evaluate it's response to a spectrum of loss-of-coolant accidents (LOCAs) with potential for leading to core damage. The MELCOR severe accident analysis code (version 1.7.1) was used to evaluate the overall dynamic response of HFIR. Before conducting LOCA ...

For presentation at International Atomic Energy Agency Symposium on Reactor Safety, Vienna, Austria, May 14The Westinghouse Testing Reactor (WTR), a privately owned 60 megawatt tank type reactor, underwent a fuel element failure on April 3, 1960. A meltdown of one fuel element occurred causing the spread of fission products through the reactor cooling system. ...

A 3-D model to predict the thermal behavior of ANS (Advanced Neutron Source) fuel miniplates has been developed. Possibility of explosive boiling was considered, and it was concluded that the heating rates (existant in NSRR tests) are not large enough for this to occur. However, transient boiling effects were pronounced. Because of the complexity of transient pool boiling and ...

About 10 hours after the March 28, 1979 loss-of-coolant accident began at Three Mile Island Unit 2 (TMI-2), a hydrogen burn occurred inside the Reactor Building. This report reviews and presents data from 16 channels of resistance temperature detectors (RTDs), 2 steam generator pressure transmitters, 16 Reactor Building pressure switches, 2 channels of ...

A 200-percent double-ended cold-leg break loss-of-coolant accident (LOCA) in a typical US pressurized water reactor (PWR) was simulated using the Transient Reactor Analysis Code (TRAC-PD2). The reactor system modeled represented a typical US PWR with four loops (three intact, one broken) and cold-leg emergency-core-cooling systems (ECCS). The finely noded TRAC model employed ...

An analysis of a loss-of-pumping accident (LOPA) in the Savannah River K-reactor has been performed using RELAP5. ECS was assumed to enter the system from only two systems in this case. No boiling occurred in the core during this calculation. Additional calculations were also performed in which the ECS delivery rate was reduced to various predetermined ...

Problems are discussed which were involved in dosimetric calculations on three individuals exposed to mixed gamma and neutron irradiation from an accidental critical excursion in a Pu processing plant. Complications connected with evaluation of doses to personnel involved in the accident ranged from the geometric and moderator characteristics of ...

An evaporator is used on liquid waste from processing facilities to reduce the volume of the waste through heating the waste and allowing some of the water to be separated from the waste through boiling. This separation process allows for more efficient processing and storage of liquid waste. Commonly, the liquid waste consists of an aqueous solution of chemicals that over time could induce ...

The report presents a preliminary record of aircraft accidents which occurred in U.S. Civil Aviation Operations during calendar year 1974. It includes a statistical recapitulation of all accidents; a comparison of accidents, fatalities, accident rates, an...

A method of caring for patients who have been exposed a peacetime nuclear accident has been described. It show be apparent that the preparation for such an accident and experience of the medical team, if such an accident should occur, would better prepare the medical profession to occur ...

During the past three years, several utilities have experienced boiler setting damage due to excessively low gas side pressure (high draft) excursions, resulting in considerable damage and revenue loss. These several incidents have caused considerable industry concern, and have prompted a mass of statements and philosophy from manufacturers, architect-engineers, and utilities. ...

An analysis of the transient behavior of a 255-Mw(e) advanced sodium graphite reactor, previously described in NAA-SR-3829, is presented. The reactor and its components are briefly described. Nuclear and thermal characteristics are presented as far as they affect reactor kinetics or are essential in interpreting the results. The study includes an investigation of the inherent ...

In recent years several commercial aircraft accidents have occurred as an aircraft attempted landing

... Insurance for Catastrophic Nuclear Accidents Features: ... After an accident occurs, they pay into a secondary insurance fund. ...

... Furthermore, when cave-in accidents occur, they are much more likely to result in worker fatalities than other excavation-related accidents. ...

(00 UNITED STATES ARMY HELICOPTER ACCIDENTS INVOLVING FIRE LI ... 13 F. Where Fire Accidents Occur ..... 15 ...

Focus Question : Why do spacecraft accidents occur, what have we learned from them, ... Spacecraft Accidents Overview - Download PowerPoint Presentation ...

Effective planning for the management of severe accidents at nuclear power plants can produce both a reduction in the frequency of such accidents as well as the ability to mitigate their consequences if and when they should occur. This report provides an ...

Aircraft Accidents and NASA's Aviation Safety Program Worksheet ... What measures would you suggest to prevent similar accidents from occurring in the ...

The development of a sheathed thermocouple suitable for attachment to zircaloy-clad fuel rods and for use during high temperature (2,800 exp 0 F) excursions under loss-of-coolant accident conditions is described. Development, fabrication, and testing of t...

The research program on the missile hazard from a reactor excursion was continued. Model firings were carried out which simulated 2-msec excursions. Simulated refueling accidents were also studied. Scaling effects are discussed. The energy source was modified to decrease the amount of damage. (D.L.C.)

Experiments designed to investigate surface dryout in a heated, ribbed annulus test section simulating one of the annular coolant channels of a Savannah River Plant production reactor Mark 22 fuel assembly have been conducted at the Idaho National Engineering Laboratory. The inner surface of the annulus was constructed of aluminum and was electrically heated to provide an axial cosine power ...

An analysis is performed to investigate the merits of using the TOPAZ-II safety drums for a backup control to prevent a reactivity excursion, stabilize the reactor, and achieve steady-state power operation, following a severe hypothetical reactivity initiated accident (RIA). Such an RIA is assumed to occur during the system start-up in ...

The upper internal structures which are located above the core and below the head cover may play a significant role in the hydrodynamics of an energy excursion such as a hypothetical core disruptive accident (HCDA) by mitigating the slug impact on the hea...

A hypothetical unprotected transient overpower accident (TOP) in the fresh and near fresh LMFBR core may involve coolant boiling prior to cladding failure for relatively slow transients. Coolant boiling on the cladding surface is a possible failure mechan...

Two explosions, one immediately following the other, in Unit 4 of the Chernobyl nuclear power station in the Soviet Union signaled the worst disaster ever to befall the commercial nuclear power production industry. This accident, which occurred at 1:24 a.m. on April 26, 1986, resulted from an almost incredible series of operational errors associated, ...

A consistent parametric calculation of a number of reactor types has been carried out to compare various methods of characterizing work energy from core-disruptive accidents. While the best method of characterizing damage is to do an explicit calculation of the actual energy partition, the finite expansion to the cover gas volume is a better measure of damage for parametric ...

The development of a sheathed thermocouple suitable for attachment to zircaloy-clad fuel rods and for use during high temperature (2,800/sup 0/F) excursions under loss-of-coolant accident conditions is described. Development, fabrication, and testing of the thermocouples is covered in detail. In addition, the development of a process for laser welding the ...

A survey of accidents in hot composite roofing is reported in this document. The survey data are analyzed to define and describe safety problems in roofing. Over 1,000 accidents occurred in 1974, which were investigated in the survey. The accident data we...

Consistent methodology should be adopted in accident analyses sections of SARs. These accident sections should describe both consequence and risk from potential accidents that could occur in a facility being assessed. These analyses should consider three ...

This publication contains summary reports of major marine accidents, occurring from January through June 1979. The summary reports present the probable cause and accident descriptions for the following accidents: Fishing vessel OCEAN CAPE lost on January ...

The gross pattern of injury--site, frequency and seriousness--in U. S. Army helicopter accidents is shown. Although 95 percent of the major helicopter accidents are survivable, 22 percent of the deaths in all helicopter accidents occur in survivable condi...

The evaluation of the dose that a person received in a criticality accident can be difficult. Most accidents have occurred when the person was not wearing nuclear accident dosimetry and since the NRC no longer requires these dosimeters, future dose evalua...

This report contains the briefs of accidents involving Taylorcraft-B aircraft occuring in 1966. There were 37 accidents involving this model aircraft out of a total of 5,712 general aviation accidents in 1966. (Author)

In the analysis of accidents a collision between aircraft is treated as one accident in the overall total. However, a complete analysis and coding is made on each aircraft involved in a collision. This produces two aircraft accident records, one for each ...

The report presents the record of aircraft accidents which occurred in U.S. civil aviation operations during the calendar year 1971. It includes a statistical recapitulation of all accidents, and a brief of each air carrier accident containing the essenti...

The report presents the record of aircraft accidents which occurred in U. S. Civil Aviation Operations during calendar year 1970. It includes a statistical recapitulation of all accidents, and a brief of each air carrier accident containing the essential ...

...2009-04-01 false Reporting accidents. 102.8 Section...AVIATION United States Aircraft Accidents Abroad § 102.8 ...promptly to the Department accidents to any United States civil aircraft occurring in the...

...respect to deceased victims of accidents. 102.13 Section 102...CIVIL AVIATION United States Aircraft Accidents Abroad § 102.13 Protective...States citizens occurring in an aircraft accident in accordance with the...

... OCCUPATIONAL RADIATION PROTECTION ...835.1304 Nuclear accident dosimetry...individuals to radiation from a nuclear accident is possible...involved in a nuclear accident to determine...significant exposures to radiation occurred;...

Geomagnetic excursions represent short episodes of a few thousand years at most during which the field considerably exceeds its normal range of variability during a polarity state. Paleomagnetic records have now been obtained with extremely high temporal resolution which have improved our knowledge of these short events. We have compiled the most detailed records of ...

Three nuclear accidents besides Chernobyl have occurred in the Former Soviet Union (FSU). The accidents occurred over the geographic area around Kyshtym and Chelyabinsk in the Urals between 1949 and 1967 and contaminated over half a million people. The fi...

The purpose of this research was to ascertain whether a significantly disproportionate number of general aviation fatal aircraft accidents occur at night. The percentage of all fatal accidents that occur at night, collected over a ten year span, were comp...

...CIVIL AVIATION United States Aircraft Accidents Abroad § 102.9 Arranging...entry into the country where the accident occurred. The local Foreign...representatives into the country where the accident occurred and in expediting...

A power excursion of approximately 425 MW occurred in R reactor when full control rods and partial rods were being inserted to shut down the reactor. A heat exchanger failure occurred in L Area. A monitor pin was replaced in K reactor because of defective...

The RELAP3B computer program describes the behavior of water cooled reactors during postulated accidents or power transients, such as large reactivity excursions, coolant loss transient, steam line break accident and the class of transients called ATWS. T...

The National Transportation Safety Board determines that the probable cause of the accident was the failure of the Norfolk and Western Railway Company (N&W) to train its Maintenance of Way Department employees adequately in the inspection and repair of co...

A system of dosimetry for persons involved in accidental criticality excursions is presented as part A of a two part report. The information is arranged to be useful as a reference for those responsible for implementing the system. Part A also contains a review and re-evaluation of the dosimetry of previous accidents and a synopsis of part B. ...

Experimental results from six recent Power Burst Facility (PBF) reactivity initiated accident (RIA) tests are compared with data from previous Special Power Excursion Reactor Test (SPERT), and Japanese Nuclear Safety Research Reactor (NSRR) tests. The RIA...

An analysis of fuel rod behavior during reactivity initiated accidents is presented. The calculational approach is described, predictions are discussed and compared to data from the SPERT power excursion tests, and the sensitivity of maximum cladding temperatures to initial reactor conditions, enthalpy insertions, and other experiment design ...

As a result of the Commissariat a l'Energie Atomique CRAC experimental program, which studied the phenomenology and the radiological consequences of a criticality excursion in fissile solution, the EDAC system has been developed. This system detects a criticality accident and warns personnel as early as possible by triggering the necessary ...

A criticality excursion occurred at the Oak Ridge Critical Experiments Laboratory on November l0, l961 as enriched uranium metal, neutron reflected and moderated by hydrogen, was being assembled. It is estimated that the energy yield was between 10/sup 15/ and 10/sup 16/ fissions. There was no personnel exposure or property damage. Fission ...

Since the reactor is not radioactive until after operation, there is no hazard associated with reactor assembly, checkout, and handling unless an accident occurs. With careful planning and the use of straightforward countermeasures, the probability of an excursion can be made exceedingly small. Other simple measures such as ...

An accidental radiation excursion occurring durin Pu/sup 2//sup 3//sup 9/ recovery operation resulted in significant exposure of three personnel, one exposure terminating in fatality. Irradiation of the fatally exposed person was nonuniform, and it was possible only to estimate his average body dose and dose incident to specific body areas. His ...

This paper documents the results of a scoping study of boron dilution and mixing phenomena during small break loss of coolant accidents (LOCAs) in pressurized water reactors (PWRs). Boron free condensate can accumulate in the cold leg loop seals when the reactor is operating in a reflux/boiler condenser mode. A problem may occur when the subsequent change ...

This paper presents the results of a study of mixing phenomena related to boron dilution during small break loss of coolant accidents (LOCAs) in pressurized water reactors (PWRs). Boron free condensate can accumulate in the cold leg loop seals when the reactor is operating in a reflux/boiler-condenser mode. A problem may occur when subsequent change in ...

This paper presents the results of a study of mixing phenomena related to boron dilution during small break loss of coolant accidents (LOCAs)in pressurized water reactors (PWRs). Boron free condensate can accumulate in the cold leg loop seals when the reactor is operating in a reflux/boiler-condenser mode. A problem may occur when subsequent change in flow ...

A series of power ramp and loss-of-coolant accidents were simulated with an electrically heated mockup of a Savannah River Site production reactor assembly. The one-to-one scale mockup had full multichannel annular geometry in its heated section in addition to prototypical inlet and outlet endfitting hardware. Power levels causing void generation and flow instability in the ...

A study was conducted on the safety aspects of foreseeable accident types in connection with the Nuclear Merchant Ship Reactor program. Four accidents have been selected for analysis by analog simulation techniques: continuous rod withdrawal, startup, loss of coolant flow, and cold-water insertion. The simulation of the reactor only was required ...

In Belgium, traffic safety is currently one of the govemment's highest priorities. Identifying and profiling black spots and black zones in terms of accident related data and location characteristics must provide new insights into the complexity and causes of road accidents which, in ram, provide valuable input for government actions. In this paper, ...

BS>In the design of the Polish high flux test reactor (30 MW) the evaluation of the possible sequences of accidents was performed and the maximum credible accident chosen. A failure of the pressure loop in the reactor core followed by the SPERT-type nuclear excursion and rupture of the remaining pressure loops in the core ...

The shape reactivity has a significant influence on the rod ejection accident. After the control rod is fully ejected from the core, the neutron flux undergoes a large reduction at the ejected rod location. The corresponding effect on the control reactivity is comparable in magnitude to the Doppler reactivity, and makes a significant contribution to limiting the power ...

Facilitated diffusion of DNA-binding proteins is known to speed up target site location by combining three dimensional excursions and linear diffusion along the DNA. Here we explicitly calculate the distribution of the relocation lengths of such 3D excursions, and we quantify the short-range correlated excursions, also called hops, and ...

The location of auroral zones is determined by the values of the strength and orientation of the magnetic dipole of the earth and by average solar wind parameters. The discussion presented assumes that solar wind averages and statistics have remained constant in time, and only changes in the location of the auroral zones resulting from changes in the geomagnetic field that ...

Thermal hydrology calculations were performed to predict the geologic thermal and saturation response of a far-field nuclear criticality. The thermal hydrology (THX) calculations used an experimental version of a transient multi-phase fluid and energy simulator, BRAGFLO{_}T. A total of 45 THX calculations were completed using various combinations of initial saturation S{sub 0}, input heat ...

Conspicuous global stable carbon isotope excursions that are recorded in marine sedimentary rocks of Phanerozoic age and were associated with major extinctions have generally paralleled global stable oxygen isotope excursions. All of these phenomena are therefore likely to share a common origin through global climate change. Exceptional patterns for carbon ...

Conspicuous global stable carbon isotope excursions that are recorded in marine sedimentary rocks of Phanerozoic age and were associated with major extinctions have generally paralleled global stable oxygen isotope excursions. All of these phenomena are therefore likely to share a common origin through global climate change. Exceptional patterns for carbon ...

Detailed paleomagnetic investigations conducted on the Malan loess (Ll) at a well-dated section (Weinan) in the Chinese Loess Plateau revealed two distinct anomalous directional intervals (ADI) accompanied by lower relative paleointensity. Rock magnetic properties and anisotropy of magnetic susceptibility (AMS) of samples taken from sedimentary horizons carrying the anomalous directions are ...

The coolant flow in a nuclear reactor core under normal operating conditions is kept as a subcooled liquid. This coolant is evenly distributed throughout the multiple flow channels with a uniform pressure profile across each coolant flow channel. If the coolant flow is reduced, the flow through individual channels will also decrease. A decrease in coolant flow will result in higher coolant ...

The coolant flow in a nuclear reactor core under normal operating conditions is kept as a subcooled liquid. This coolant is evenly distributed throughout the multiple flow channels with a uniform pressure profile across each coolant flow channel. If the coolant flow is reduced, the flow through individual channels will also decrease. A decrease in coolant flow will result in higher coolant ...

This report was prepared at the request of the President's Commission on the Accident at Three Mile Island to provide the members of the Commission with some insight into the nature and significance of accidents that have occurred at nuclear reactor facilities in the past. Toward that end, this report presents a brief ...

...false How must I notify BLM of accidents occurring at my utilization facility...15 How must I notify BLM of accidents occurring at my utilization facility...You must orally inform us of all accidents that affect operations or...

...2010-10-01 false How do I notify BLM of accidents occurring on my lease? 3264.14...3264.14 How do I notify BLM of accidents occurring on my lease? You must orally inform us of all accidents that affect operations or create...

An analysis is performed to investigate the merits of using the TOPAZ-II safety drums for a backup control to prevent a reactivity excursion, stabilize the reactor, and achieve steady-state power operation, following a severe hypothetical reactivity initiated accident (RIA). Such an RIA is assumed to occur during the system start-up in ...

There is a need for computer simulation of hypothetical criticality excursions involving significant quantities of fissionable materials, especially in fissile aqueous system. The need arises due to the requirements for the emergency planning of facilities where the fissionable materials are handled, processed, or stored; and the regulatory requirements associated with ...

Flow excursion transients give rise to a key thermal limit for the proposed Advanced Neutron Source (ANS) reactor because its core involves many parallel flow channels with a common pressure drop. Since one can envision certain accident scenarios in which the thermal limits set by flow excursion correlations might be exceeded for brief ...

accidents that might occur while the reactor is operating at I00 percent power, This ... The accidents investigated are not unique, Many reactors would fail ...

This slide presentation reviews the accident that occurred in 1985 when a bay bucket hoist fell from

What measures would you suggest to prevent similar accidents from occurring in the future? Answers will vary. Might discuss better information system, ...

Jan 1, 1972 ... Board showed that 16054 civil aviation accidents occurred in the ... Four case histories of major accidents are included in the paper as ...

... YIELD AND POTENTIAL TO AVOID DAMAGE BY ... the building in which the accident occurred had ... destruction at Radford could have been avoided. ...

... Explosive Yield and Potential to Avoid Damage by ... the building in which the accident occurred had ... cost of the destruction could have been avoided. ...

The authors explain how the accident at Chernobyl was the result of a poorly prepared and unauthorized experiment. The article outlines the steps leading up to the accident and what was done immediately after it occurred.

This report summarizes the accidents and unscheduled events which may occur during the extraction, production, transportation, and utilization of non-nuclear energy technologies....

ing the effects of those accidents that do occur. Prevention and mitigation activities include: .... ing accidents caused by in-flight fires and elimi- ...

BACKGROUND: Documentation and analysis of aviation accidents is very important to improve aviation safety and post-accident survival. In this study we aimed to evaluate the civilian aviation accidents between 1955 and 2003 in Turkey to identify the risk factors for fatal and non-fatal injuries. METHODS: Records of Civilian Aviation ...

Significant number of fatal aircraft accidents in recent years have been linked to component failures. With the predicted increase in air traffic these numbers are likely to increase. With reduction of fatal accidents as motivation, this dissertation investigates design of fault tolerant control systems for aircrafts undergoing sensor and/or actuator ...

Experiments have been performed to simulate accidents which may occur during large-scale production of micro-organisms. Four types of accident, which were considered to be the most likely to result in the greatest hazard to health, were simulated using a bacterial model. The accidents were all concerned with faults ...

A study was undertaken of power excursions in high burnup cores. There were three objectives in this study. One was to identify boiling water reactor (BWR) and pressurized water reactor (PWR) transients in which there is significant energy deposition in the fuel. Another was to analyze the response of BWRs to the rod drop accident (RDA) and other ...

Consistent methodology should be adopted in accident analyses sections of SARs. These accident sections should describe both consequence and risk from potential accidents that could occur in a facility being assessed. These analyses should consider three general classes of accidents; they are ...

An experimental program has been conducted to determine the feasibility of natural convection cooling of a reactor following a beyond-design-based accident. The particular application under consideration was the heavy-water new production reactor. The questions to be resolved include the verification that a natural convection cooling pattern would be established and the ...

On January 3, 1961, at the National Reactor Testing Station, in Idaho Falls, Idaho, the Stationary Low Power Reactor No. 1 (SL-1) experienced a major nuclear excursion, killing three people, and destroying the reactor core. The SL-1 reactor, a 3 MW{sub t} boiling water reactor, was shut down and undergoing routine maintenance work at the time. This paper presents an analysis ...

maneuvers to avoid slower moving traffic and stopped vehicles. School Bus Mechanical Inspection The accident accident that occurred in Liberty, Missouri. During the course of the investigation, information was uncovered that suggested pedal misapplication as a factor in the accident--that is, depressing

The report analyzes general aviation takeoff accidents which occurred in 1974, with special emphasis on the involvement of preflight planning. The study discusses the most frequently referenced cause/factors in takeoff accidents in relation to the type ce...

The purpose of the report is to present the record of aircraft accidents, incidents to flight, which occurred in U.S. air carrier operations during the calendar year 1968. It includes a statistical recapitulation of all accidents, and a brief of each acci...

The study deals with 97 turbulence-involved U. S. air carrier accidents occurring from 1964-1969. Based on the detailed investigation of those accidents, there is discussed lessons to be learned primarily from the point of view of the meteorologist, the a...

The report summarizes the status of actions taken by the U.S. Nuclear Regulatory Commission (NRC) in response to recommendations made by the Presidential Commission on the Accident at Three Mile Island in the 10 years since the accident occurred in March ...

The report presents the compilation of information obtained by various organizations regarding the accident (and the consequences of the accident) that occurred at Unit 4 of the nuclear power station at Chernobyl in the USSR on April 26, 1986. Each organi...

The report presents the compilation of information obtained by various organizations regarding the accident (and the consequences of the accident) that occurred at Unit 4 of the nuclear power station at Chernobyl in the USSR on April 26, 1986. Chapter 1 p...

The publication contains briefs of selected railroad accidents occurring in U.S. Railroad operations. The brief format presents basic facts, conditions, circumstances, and probable cause(s) in each instance.

A brief survey and general discussion is given of accidents during dental radiography which resulted in unintended radiation doses to patients and personnel. Such accidents occur in Norway with a frequency of 3-4 per year. Recommended procedures for check...

Results are given of an investigation of an accident which occurred at the intersection of Kelton Avenue and Oak Street. Vehicle A, the case vehicle, was traveling north on Kelton Avenue in the righthand lane. Vehicle B was traveling east on Oak Street. T...

The publication is a summary of a marine accident investigated by the National Transportation Safety Board. The accident occurred in the Mississippi River Gulf Outlet Canal on October 28-29, 1985.

Serious accidents and incidents occurring within the Department of Energy (DOE) will be investigated by committees including DOE trained investigators. A part of the investigation includes evaluation of management systems as they relate to the accident. T...

The investigation includes 31 cases of fatal automobile accidents which occurred in the Greater Boston area. The scope of the investigation was enlarged to include two-car collisions. The investigation was gradually limited to accidents in which recent mo...

The Statistical Review of General Aviation Accidents is published annually by the National Transportation Safety Board. This publication contains statistical information compiled from reports of General Aviation accidents that occurred during the calendar...

Since the TMI-2 accident, which occurred in 1979, necessity of understanding phenomena associated with a severe accident have been recognized and researches have been conducted in many countries. During a severe accident of a light water reactor, a debris...

The world's worst radiation accident occurred at the Chernobyl nuclear power plant in the USSR during the early hours of April 26, 1986. This accident unleashed megacuries of radioactive contamination into the atmosphere, generated an explosive blast that...

Although this data is specialized to USAF-connected accidents, a part of which occur on AF bases, it is felt that there is a commonality between AF vehicles and civilian vehicles in the accident phenomenon. The major objectives of the analysis are several...

The publication contains selected aircraft accident reports, in brief format, occurring in U.S. civil aviation operations during calendar year 1976. The 898 General Aviation accidents contained in this publication represent a random selection. This public...

This publication contains selected aircraft accident reports, in brief format, occurring in U.S. civil aviation operations during calendar year 1977. The 897 General Aviation accidents contained in this publication represent a random selection. This publi...

The use of aircraft in agricultural operations is increasing. The accident rate for aerial applicators is second only to pleasure flying. An analysis of 1,328 aerial application accidents revealed the large majority of these occurred during the summer. Mo...

This report summarizes the accidents and unscheduled events which may occur during the extraction, production, transportation, and utilization of non-nuclear energy technologies.

...prevent future aviation accidents; participates in the investigation of accidents that occur in foreign countries...or U.S.-manufactured aircraft; and conducts special investigations into selected aviation accidents involving safety...

This report summarizes the process test in which the airlift circulators in Tank 241-AZ-101 were shutdown. The test was successful, in that no extreme temperature excursions occurred. Only general data was obtianed through the use of a gamma energy probe.

Decompression sickness following excursions to low atmospheric pressures has recently been a topic of confusion and concern. This article provides a reference for management of decompression sickness occurring after exposure to a reduction in ambient pres...

This paper presents an analysis of much of the available data relating to the cocaine industry and from that analysis arrives at four primary findings: (1) significant upward excursions in cocaine street prices have occurred in the U.S. since 1983; (2) U....

and isolated pods of carbonate breccia are visible enclosed within the Upper Triassic siliciclastic strata of the Bianyang Formation (fig. 9). These breccias occur at the base of the Ladinian escarp- ment and are equivalent to the Carnian breccias interbedded with the Bianyang Formation exposed at the top of Guandao

In order to assess the relationship between suicidal behavior and traffic accidents, we analyzed the seasonal patterns of completed suicides and deaths related to traffic accidents in France over a period of 8 years. We found a clear seasonal rhythm of completed suicides with a peak in May, and an additional peak in September. The traffic ...

This report describes analyses of the response of a Pressurized-Water Reactor at the Zion Plant to hypothetical core-meltdown sequences. The analyses consider the progression of core meltdown, containment response, and consequences to the public for many specific accident sequences within the categories of Loss of Coolant Accidents (LOCAs), ...

Powder blenders are used in nuclear fuel fabrication facilities to blend dry low-enriched uranium (LEU) oxide powder to achieve uniform physical and chemical characteristics as required by product and process specifications. Blenders rely principally on moderation control for nuclear criticality safety and are, therefore, subject to criticality reviews since an inadvertent ingress of water could ...

The systematics of the characteristics of twenty-one criticality accidents occurring in nuclear processing facilities of the Russian Federation, the United States, and the United Kingdom are examined. By systematics the authors mean the degree of consistency or agreement between the factual parameters reported for the accidents and the ...

Elements of risk in reactor accidents are discussed. Estimates of the public risk from nuclear-power-plant accidents hinge on three important factors: (1) the probability of specific events occurring that could lead to an accident involving radiation release; (2) the quantity, type, and timing of release of ...

1 DESCRIPTION OF THE ACCIDENT / INCIDENT: Did the accident / incident cause harm: ! Yes ! No ! Not known Specify : Did the accident / incident occur in training: ! Yes ! No ! Not known Specify : Diver....TD Not known ........ NK CDAA .. Cavern CA Other..................... .. Sinkhole SI ..Cave CV .. Penetrat. PN

The publication contains reports of aircraft accidents and incidents that occurred in 1977 and have not been included in a prior issue of briefs. Included are one U.S. air carrier accident, 26 U.S. air carrier incidents, 44 general aviation accidents occu...

This publication contains reports of aircraft accidents and incidents that occurred in 1980 and have not been included in a prior issue of briefs. Included are 14 U.S. air carrier accidents, 18 U.S. air carrier incidents, 106 general aviation accidents oc...

During the period considered a mean of eleven accidents per year occurred and a mean of eleven persons were killed or seriously injured per year. Forty-one percent of the accidents occurred during hover, and 63 percent of the accidents had pilot error lis...

In 1990, 2,378 accidents, or 47 percent of all accidents that occurred at grade crossings, occurred at passively signed crossings. This demonstrates the need for an effective passive device at railroad crossings to warn motorists and reduce the number of ...

Many accidents occur in the mining industry as a result of the instability of material during handling and processing operation. Accidents due to dump point instability at stockpiles, and at spoil or waste piles, for example, occur with alarming frequency...

Models were developed for analyses of economic risks from unanticipated events which occur, or could occur, during US LWR plant operation. The models estimate the economic consequences of LWR forced outages and accidents and can be used together with esti...

The objective of SIMMER qualification testing program is to assure that the mathematical models and input parameters are derived from experimental data, which, on the basis of criteria still to be established, are representative of the phenomena and processes governing the progression of a CDA in an LMFBR. At the present time, the work to meet this objective can be classified into three general ...

Dramatic global warming, triggered by release of methane from clathrates, has been postulated to have occurred during the early Toarcian age in the Early Jurassic period. Kemp et al. claim that this methane was released at three points, as recorded by three sharp excursions of delta13C(org) of up to 3 per thousand magnitude. But they discount another ...

A paleomagnetic study was performed in clayey-carbonate sedimentary sequences deposited during the last 400 kyr on the Portuguese margin (Northeast Atlantic Ocean). Declination and inclination of the stable remanent magnetization present recurrent deviations from the mean geomagnetic field direction. The normalized intensity documents a series of relative paleointensity (RPI) lows recognized in ...

... events have fortunately occurred infrequently as compared to accidents and natural ... Terrorism Risk Modeling for the Insurance Industry: The RMS ...

... the benefits of passenger protective breathing devices and other fire safety improvements based on an analysis of accidents involving fire occurring ...

... government and related stakeholders (EPA, Crop Life America, insurance companies, etc ... be to look solely at the number of accidents that occurred ...

... for a hypothetical population of individuals exposed to these levels of radiation. Cancer ... exposure to naturally occurring radon. ...

... While the risk of a catastrophic accident may be remote, if it occurs, it could be far in excess of the insurance coverage that ...

May 22, 2010 ... In the weeks since the accident occurred, the oil slick has periodically drifted northeast toward the Mississippi Delta and reached the ...

... Abstract : Many of the accidents occurring in robot applications are attributable to the fact that safety systems are not tailored to the particular ...

There were 196 successful landings in the program, and the two landing accidents that occurred were related to system or structural failures and not to ...

Mar 2, 2011 ... Numerous aircraft accidents had occurred because of windshear, ... develop the essential technology for detecting and avoiding microbursts. ...

... to the test standard used. No laboratory accidents occurred during the test program. My inspiration for this study was provided by Dr. William C. ...

... queries the DTIC Online Public Web site. ... that occur outside military installations. ... PUBLICATIONS, *ACCIDENTS, NUCLEAR WEAPONS, POLICIES ...

... To avoid the embarrassment of having ... A significant percentage of accidents and incidences of spatial disorientation occur when aircraft ...

The objectives of this work were to evaluate the consequences of a postulated accident to onsite security personnel stationed near the facility during operations of the Godiva IV critical assembly and to identify controls needed to protect these personnel in case of an extreme criticality excursion equivalent to the design-basis ...

The construction of pressurized water reactors with large excess reactivities has made possible accidents with fast power excursions. A knowledge of the fastest power transient that a pressurized water reactor is capable of withstanding without destnactive effects is an important factor in its safety aspects. Possible methods of attack are ...

SACO is a fast-running computer code that simulates hypothetical accidents in liquid-metal fast breeder reactors to the point of permanent subcriticality or to the initiation of a prompt-critical excursion. In the tradition of the SAS codes, each subassembly is modeled by a representative fuel pin with three distinct axial regions to simulate the blanket ...

A historic meeting was held Aug. 25-29, 1986, in Vienna, Austria. A delegation of U.S.S.R. experts presented detailed information on the design characteristics of the RBMK-1000 type of reactor and their evaluation of all aspects of the Chernobyl accident, including causes, events, measured releases, mitigation efforts, response measures taken, atmospheric transport, and the ...

Safety analysis of fast reactors--especially the investigation of hypothetical prompt critical excursions--requires knowledge of the fuel pressures in the temperature range above 3000 exp 0 K, where up to now no measured data have been available. Various ...

The upper internal structures which are located above the core and below the head cover may play a significant role in the hydrodynamics of an energy excursion such as a hypothetical core disruptive accident (HCDA) by mitigating the slug impact on the head. For purposes of studying these effects, a structural model was developed for the upper internals and ...

Health physics studies are described which were used to estimate area radiation levels from an accidental critical excursion in a Pu processing plant. It is pointed out that the principal health hazard in this area was considered to be alpha radiation from Pu and monitoring personnel assigned to the building were primarily concerned with incidents or ...

A series of power ramp and loss-of-coolant accidents were simulated with an electrically heated mockup of a Savannah River Site production reactor assembly. The one-to-one scale mockup had full multichannel annular geometry in its heated section in additi...

Information on the HTLTR Reactor is presented concerning: reactor site; reactor buildings; reactor kinetics and design characteristics; experimental and test facilitles; instrumentation and control; maintenance and modification; initial tests and operations; administration and procedural safeguards; accident analysis; seifterminated excursions; ...

Progress is summarized in the following study areas: accident energetics; core debris behavior; sodium containment and structural integrity; research for elevated temperature design criteria; fuel motion detection; and ACPR fuel motion detection system.

Testing may occur prior to employment, at random, where there is reasonable suspicion of alcohol or drug use, when a work-related incident/accident occurs, ...

This note provides new information regarding the market reaction toward electric utility stocks that resulted both from the accident at Three Mile Island, and the events predating and postdating the accident. The results suggest that some of the market reaction heretofore ascribed to the accident resulted instead from regulatory ...

Detailed reactor physics and safety analyses have been performed for the 20 MW D{sub 2}O moderated research reactor (NBSR) at the National Institute of Standards and Technology (NIST). The analyses provide an update to the Final Safety Analysis Report (FSAR) and employ state-of-the-art calculational methods. Three-dimensional Monte Carlo neutron and photon transport calculations were performed ...

Pioneer Venus Orbiter data are used as evidence of naturally occurring magnetic field filamentary structures which can be described by a flux rope model. The solar wind is interpreted as piling up a magnetic field on the Venus ionosphere, with the incident ram pressure being expressed as magnetic field pressure. Currents flowing at the ionopause shield out the field, allowing ...

Chance fractures of the skeletally immature spine classically occur in frontal motor vehicle accidents (MVAs) when the occupants are restrained by a lap belt only and undergo traumatic hyperflexion of the torso during the impact. We retrospectively examined all MVA-related Chance fractures at British Columbia's Children's Hospital since 1986, by collecting ...

As a matter of good business practices, a team of glovebox experts from Los Alamos National Laboratory (LANL) has been assembled to proactively investigate processes and procedures that minimize unplanned breaches in the glovebox, e.g., glove failures. A major part of this effort involves the review of glovebox glove failures that have occurred at the Plutonium Facility and at ...

The coolant in the Savannah River Site (SRS) production nuclear reactor assemblies is circulated as a subcooled liquid under normal operating conditions. This coolant is evenly distributed throughout multiple annular flow channels with a uniform pressure profile across each coolant flow channel. During the postulated Loss of Coolant Accident (LOCA), which is initiated by a ...

by the night vision devices. Many more accidents might have occurred if aircrews had not been wearingInteractions between Brown-out Accidents and Night Vision Equipment in Military Aviation Accidents: Accident/Incident Analysis, Crew Safety, Military Safety. Abstract Night vision devices (NVDs) ...

Fourteen nuclear criticality accidents that occurred in Russia between 1953 and 1997 are described. These accidents are significant because of the loss of control of special nuclear material and the resultant radiation doses to personnel, potential damage to equipment, and release of radioactive material to the workplace and the ...

Fourteen non-reactor nuclear criticality accidents that occurred in Russia between 1953 and 1997 are described. These accidents are significant because of the loss of control of special nuclear material and the resultant radiation doses to personnel, potential damage to equipment, and release of radioactive material to the workplace ...

At global scale, the synchronicity of abnormal directions of the paleomagnetic field and minimum intensities supports the hypothesis of a relationship between the occurrence of excursions and/or polarity changes and the collapse of the dipolar component. We present quantitative evaluations of relationships between 10Be production rate variations and geomagnetic events using ...

Dissolved boron is required for control of reactivity in a pressurized water reactor that is shut down. TRAC-PF1 calculations for a typical PWR for vessel-closed and vessel-open configurations show that a high-power excursion (approaching 20% of nominal operating power) is possible if dilution of the boron solution occurs. The calculations also show that ...

Measurements of the radial electric field have been obtained on the Tokamak Fusion Test Reactor utilizing the motional Stark effect diagnostic. A large negative excursion in the radial electric field occurs before the transition to the enhanced reversed magnetic shear mode. The electric field is localized to a narrow spatial region and is not observed in ...

In May 2004, 97 of 309 (31%) and 97 of 207 (47%) school students from geographically distant areas were affected by acute gastroenteritis during excursions to neighboring hotels. The two hotels were 300 m apart, on Jeju Island, South Korea. Several strains of norovirus, including both genogroup I and genogroup II viruses, were identified in stool samples from the students and ...

According to a study by the ASME Research Committee in Industrial and Municipal Waste, rotary kilns are a proven technology for thermal treatment of a wide variety of combustible waste materials ranging from consumer products to organic chemicals. Because products to organic chemicals. Because discrete units of waste of irregular size are charged to rotary kilns, occasional combustion ...

Volcanic and sedimentary records of reversals favour a model which involves a control of the lower mantle on the dynamo processes prevailing during the transition. This has been constrained either by the existence of preferred longitudinal bands of VGPs and/or by clusters of VGPs linked to flux patches. Recent excursion records show VGP paths which are relatively confined ...

All accidental criticality excursions are accompanied by neutron and gamma radiation that creates two possible types of radiation risk: (1) immediate risk for the personnel directly exposed; and (2) deferred risk in the case where an intervention team is required in the postaccident phase. These aspects, or more specifically dose measurement and the possibility of calling on ...

The Ocean Drilling Project has provided a unique opportunity to recover long, high-resolution Quaternary deep-sea sediment sequences from around the world that contain remarkably detailed records of past geomagnetic field directional variability. These paleomagnetic secular variation (PSV) records have permitted us to develop an important new view of geomagnetic field variability between ...

A quantitative analysis was made of the response of plate fuel elements in the beyond DNB (direct nucleate boiling)'' heat transfer region. Two solutions were derived, one with no scram and the other with a scram at0.8 sec after start of accident, and a forced DNB 0.5 sec after accident is assumed in both cases. Plots are ...

Nuclear accidents from uncontrolled supercriticality which took place in several nations from 1945 to 1958 are discussed. A survey was made of the characteristics of the equipment involved in these accidents and of their mechanism. These accidents concerned critical assemblies, subcritical reactors, power reactors, and parts ...

Accidents could occur during the transportation of spent nuclear fuel and high-level radioactive waste. This paper describes the risks and consequences to the public from accidents that are highly unlikely but that could have severe consequences. The impact of these accidents would include those to a collective ...