This guide describes a system acceptable to the NRC staff for meeting the Commission's requirements for a criticality accident alarm system. The guidance on criticality accident alarm systems contained in ANSI/ANS-8.3-1979 Criticality ...
Energy Citations Database
The American National Standard ANSI/ANS-8.3-1986, Criticality Accident Alarm System provides guidance for the establishment and maintenance of an alarm system to initiate personnel evacuation in the event of inadvertent criticality. In addition to identif...
National Technical Information Service (NTIS)
This report specifically deals with Savannah River Site augmentation of permanent Criticality Accident Alarm Systems by the use of portable instruments in areas not normally occupied by personnel.
DOE Information Bridge
This work analyzes the optimal placement of a criticality accident alarm system (CAAS) necessitated by an unexpected accumulation of fissile materials in the filtration system of an idled experimental nuclear reactor. Results using multidimensional determ...
... FILES, FIRE DETECTORS, FIRE EXTINGUISHERS, ACCIDENT INVESTIGATIONS, FIRE SAFETY, FIRE HAZARDS, FIRE ALARM SYSTEMS. ...
DTIC Science & Technology
Since many alarms which are activated during major process deviations or accidents in nuclear power plants can result in negative effects for operators, various types of advanced alarm systems that can select important alarms for the identification of process deviation have been developed to ...
The purpose of this paper is to give a description of the Criticality Accident Alarm System (CAAS) presently installed at the Fernald Environmental Management Project (FEMP) for monitoring areas requiring criticality controls, and some of the concerns associated with the operation of this system. The ...
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.
The Oak Ridge Y-12 Plant operates its Criticality Accident Alarm System (CAAS) according to the guidance of Standard ANSI/ANS-8.3-1986. This standard requires that the detector shall not fail to initiate an alarm when subjected to a radiation field of at ...
An application of CTI (Computer Telephone Integration) technique to fault alarming in time keeping system is presented in this paper. Two key parts of this alarming system, telephone phonic card and TTS (Text To Speech) are briefly introduced. A series of events and methods for programming interface based on ...
NASA Astrophysics Data System (ADS)
to assist in the search and rescue operations for. survivors of airplane crashes and boat accidents. The high failure rate and high false alarm rate ...
NASA Website
The purpose of the work described in this paper was to evaluate the adequacy of criticality accident alarm system (CAAS) coverage of several buildings at the Portsmouth Gaseous Diffusion Plant (PORTS) located in Piketon, Ohio. An analysis was performed in which the General Monte Carlo N-Particle Transport Code (MCNP) was used to model ...
The characteristics, detection, and emergency management of nuclear criticality accidents outside reactors has been an important component of criticality safety for as long as the need for this specialized safety discipline has been recognized. The genera...
This work analyzes the optimal placement of a criticality accident alarm system (CAAS) necessitated by an unexpected accumulation of fissile materials in the filtration system of an idled experimental nuclear reactor. Results using multidimensional deterministic and Monte Carlo methods confirmed the suitability of ...
Neutron-sensitive radiation detectors are used in the Portsmouth Gaseous Diffusion Plant's (PORTS) criticality accident alarm system (CAAS). The CAAS is composed of numerous detectors, electronics, and logic units. It uses a telemetry system to sound buil...
A surgery of 349 cardiac surgeons showed that during a six-year period, a pump oxygenator accident serious enough to cause patient injury or death occurred one per 1,000 procedures. A total of 264 deaths occurred as a direct results of an accident. Air embolism and disseminated intravascular coagulation were the two most common problems. Low-level ...
PubMed
Criticality Accident Alarm System (CAAS) detectors on the cell floor of the X-326 process building at the Portsmouth Gaseous Diffusion Plant (PORTS) are located at a height of 5 m above the cell floor. It has been suggested that this height be lowered to ...
A previous analysis of the X-700 Building Criticality Accident Alarm System (CAAS) showed that some of the building may not adequately be covered by the one building CAAS detector in its current location. This report compares the results of that analysis ...
The nuclear criticality accident radiation alarm system installed at the Portsmouth Gaseous Diffusion Plant was tested extensively at critical facilities located at the Los Alamos National Laboratory. The ability of the neutron scintillator radiation detection units to respond to a minimum accident of concern as ...
Even though the prevention of a criticality accident through engineered and administrative controls is of foremost importance at a non-reactor fuel production facility, there is always some residual risk of a criticality accident. Criticality alarm systems are provided for non-reactor nuclear facilities in areas ...
The Oak Ridge Y-12 Plant operates its Criticality Accident Alarm System (CAAS) according to the guidance of Standard ANSI/ANS-8.3-1986. This standard requires that the detector shall not fail to initiate an alarm when subjected to a radiation field of at least 0.1 Gy/s (10 rad/s). It also requires that the ...
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 ...
This report summarizes the results of an evaluation of Criticality Accident Alarm System (CAAS) coverage of the operating floors (first floors) of the X-333, X-330, and X-326 buildings. CAAS coverage of the process cell floors (second floors) has been eva...
This report summarizes the results of an evaluation of Criticality Accident Alarm System (CAAS) coverage of the X-710 and X-760 buildings and the north half of the X-7745-R storage lot located east of the X-7725 building at the Portsmouth Gaseous Diffusio...
Evaluation of criticality accident risks in the processing of significant quantities of fissile materials is both complex and subjective, largely due to the lack of accident statistics. Thus, complying with standards such as ISO 7753 which mandates that the need for an alarm system be evaluated, is also subjective. ...
The American National Standard ANSI/ANS-8.3-1986, Criticality Accident Alarm System provides guidance for the establishment and maintenance of an alarm system to initiate personnel evacuation in the event of inadvertent criticality. In addition to identifying the physical features of the ...
The Pacific Northwest Laboratory in Richland, Washington, operated by Battelle Memorial Institute for the Atomic Energy Commission has a new alarm system to detect and warn of uncontrolled nuclear criticality accidents. The basic elements of the system, n...
