On various occasions during pulse mode operation the shim and regulating control rods would drop when the pulse rod was withdrawn. Subsequent investigation traced the problem to the pulse rod shock absorber which was found to be low in hydraulic fluid. The results of the investigation, the corrective action taken, ...

The MIC program aimed for mathematical simulation of experiments on measuring reactor control system absorbing rod efficiency and obtained data processing is described. The method of interference corrections used for calculations permits on the base of kn...

: Dynamic vibration absorbers. Acoustics: The nature of sound, measurement of noise, legislation, industrial vibration of rods, lateral vibration of beams. Vibration reduction: Dynamic vibration absorbers. Acoustics, Prentice Hall. R.F. Steidel, An Introduction to Mechanical Vibrations, Wiley. W.T. Thomson, Theory

Requirements for absorber pins for liquid metal fast reactor control rod assemblies are presented. (auth)

Holographic interferometry employing temperature-induced changes of the refractive index of water has been used to measure absorbed dose distribution around an aluminum-rod immersed in water and exposed to a 3-MeV electron beam.

Using pulsed source measurements, doubling time and rod fall measurements during the first approach phase of the FRJ-1 (MERLIN) in February and March 1962, the operation of the two safety rods and the control rods in 8 different nuclear configurations with a maximum of 24 fuel elements ...

Geometrical factors suitable for use in Mie-Gans theory are derived from discrete dipole aproximation generated spectra for a number of pseudonanorods permitting the rapid calculation of extinction spectra. It is shown that the rod width, rod end-cap geometry (flat, oblate spheroid, and sphere) and the rod size distribution all have a ...

We studied the responses of rod photoreceptors that were elicited with light flashes or sinusoidally modulated light by using intracellular recording. Dark-adapted Xenopus rod photoreceptors responded to sinusoidally modulated green lights at temporal frequencies between 1 Hz and 4 Hz. In normal Ringer's solution, 57% of the rods ...

The drive for an absorber rod for a nuclear reactor has a drive piston guided in a cylinder combined with the absorber rod forming an absorber unit. In order to compensate the forces exerted by the medium of the pressure vessel on the absorber unit and tending to pressure ...

A shock absorber is designed for absorbing longitudinal impact shocks in reactor control rods being dropped within a reactor. The shock absorber comprises a buffer member with one end projecting from the control rod and the other end being tapered and projecting into a deformable sleeve ...

A shock absorber is designed for absorbing an impact shock on the end of a reactor control rod when it is dropped. The absorber comprises a buffer member projecting from the bottom of the control rod, retaining members connecting the buffer member with the control ...

... Abstract : The criticality and distribution conditions of neutron ... thermal-neutron reactor with a system of absorbing ... circle in the core or radial reflector. ...

The methods and results of the control rod calibration in the heavy water reactor DIORIT are given. The various techniques used, namely period measurement, rodoscillation, quasi-homogeneous poisoning, xenon poisoning, and the source jerk technique are compared. Differences in the results are discussed and the best values for the worth of the ...

As a result of the Chernobyl accident, the Soviets have studied and implemented various design changes to improve the safety of the RBMK reactors. The safety measurements include modifications of the control rod configuration, fuel enrichment increase from 2.0 to 2.4 weight percent U-235, and installation of additional supplemental ...

The authors describe and experimental method for investigating the entire efficiency curve of an evacuated tube collector, using a solid aluminium rod rather than a liquid coolant. In actual use the collector employs a cylindrical metal heat fin bonded to a U-tube for heat extraction purposes. By replacing the heat fin with a solid aluminium rod of similar ...

Based on the theory of neutron noise arising from the vibration of a localized absorber, the possibility of rod vibration diagnostics is investigated. It is found that noise source characteristics, namely rod position and vibration trajectory and spectra, can be unfolded from measured neutron noise signals. For the ...

The fluorescent response of silver-activated phosphate glass rods exposed to thermal and 14 Mev neutrons was investigated. For thermal neutrons, most of the absorbed dose in the glass rods arises from to 1000 deg F. -emission of activated silver nuclei; and the response per rad in the glass rods is the ...

Experimental results are reported on the room-temperature operation of Nd:YAG lasers end pumped with an LED. The radiation from a 10% efficient 0.46 mm-dia domed LED was coupled to the end of a 0.46-mm-diam x 5.0-mm-long laser rod with a large hemispherical reflector. At 20/sup 0/C, a multimode laser power of 0.25 mW was obtained at an LED current of 250 mA. By ...

Neutron radiography was used for the investigation of the nuclear fuel and control rod cladding behaviour during steam oxidation under severe nuclear accident conditions. In order to verify the hypothesis that the unexpectedly high neutron cross-section found after oxidation of Zircaloy-4 in wet air containing 10% steam is caused by a strong hydrogen uptake, the wavelength ...

A method is proposed of estimating experimentally the reactivity worth of multiple control rods by single-rod experiment. In the method, the contribution of each control rod to the multiple-rod worth is obtained by the measured single-rod worth, to which ...

... Accession Number : ADD306524. Title : DEFORMATION MEASUREMENTS ON CONNECTING RODS BY SPECKLE PHOTOGRAPHY. ...

A composite control rod for use in controlling a nuclear reactor is described. The control rod is of sandwich construction in which finned dowel pins are utilized to hold together sheets of the neutron absorbing material and nonabsorbing structural material thereby eliminating the need for being dependent on the ...

Work is now in progress to design and fabricate europia (Eu$sub 2$O$sub 3$) control rods for irradiation testing in one of the early operating cycles of the Fast Test Reactor (FTR). These tests will provide data for evaluating europia as a possible control rod absorber material in fast reactors. Prediction of the reactivity ...

A control rod assembly is designed with a shock absorber on its lower end and with means for indicating when the shock absorber is inoperative. The means comprises a support rod coupled to the assembly by means of shear pins; impact is absorbed by a buffer which breaks the shear pins, ...

The control of the Melusine and Triton is obtained principally by a series of measurements of the neutron flux and by a system of manual or automatic operation of the absorbing rods in the core which permits the neutron flux to be stabilized at a predetermined value. A general description is given of both controls. A ...

FIGURE 3. Convergence at the rod-to-rod bipolar synapse. A: a rod bipolar cell pools inputs from many rods, but near absolute visual threshold only one rod may absorb a photon (red), whereas the remaining rods are generating electrical noise (blue). A nonlinear threshold ...

Researchers have performed many studies to try to understand crud formation on the fuel pin clad surfaces, which has been observed in pressurized water reactors (PWR) as a result of sub-cooled nucleate boiling and precipitation reactions. Crud deposits, may cause an unexpected change in core power distribution known as crud induced power shift (CIPS) or axial offset anomaly (AOA) if boron species ...

The design of the EGCR control rod drive system is described. Calculations related to the drive mechanism and shock absorber are included. (J.R.D.)

Progress is reported in the areas of fuel centerline temperature measurement, fuel rod pressure measurement, fuel rod axial motion, and upper plenum gas temperature measurement.

This patent describes the method of operating pressurized-water nuclear reactor fueled by material having both fissile and fertile constituents in such manner that the neutron spectrum is hardened at the beginning of normal reactor operation and during prolonged reactor operation which results in the gradual depletion of reactor fuel. The neutron spectrum is gradually shifted toward a more ...

A novel wading rod is provided for safe, accurate, convenient and effective use in measuring stream flow velocity which comprises a base, lightweight non-metallic rods, including a front stationary rod and a rearward adjustable sliding rod with locking me...

An electromagnetic apparatus for moving a rod-like member in small steps in either direction is described. The invention has particular application in the reactor field where the reactor control rods must be moved only a small distance and where the use of mechanical couplings is impractical due to the high- pressure seals required. A ...

the method to the epi-cadmium capture rates at various radii of uranium rods .... the correct capture rate C in an absorber of atom density N and volume V. ...

Simple diffusion theory cannot be used to evaluate control rod worths in thermal reactors because of the strongly absorbing character of the control material. However, good results can be obtained from a diffusion calculation by representing the absorber slab by means of a suitable pair of internal boundary conditions, ..cap alpha.. ...

A method for determination of homogenization coefficients permitting to calculate effective cross sections for the materials of the VG-400 reactor absorbing rods placed in the radial reflector is suggested. The calculations are conducted in two stages. Re...

An approach to the development of a mathematical model for calculating heat release in absorbing rods of HTGR control elements using the HGR-50 reactor as an example is presented. On the basis of results of neutron-physical calculations of the reactor wit...

A coupler is described for absorber rods being suspended during operation of nuclear reactors which includes plurality of actuating elements being movable for individually and jointly releasing the coupler, the movement of each of the actuating elements for releasing the coupler being independently controllable.

This standard establishes the requirements for absorber pins for liquid metal fast reactor control rod assemblies. Included are a listing of applicable documents, technical requirements, quality assurance requirements, preparation for delivery, and notes and ordering data checklist.

Simple diffusion theory cannot be used to evaluate control rod worths in thermal reactors because of the strongly absorbing character of the control material. However, good results can be obtained from a diffusion calculation by representing the absorber ...

This report describes the design and fabrication requirements for a tritium-producing burnable absorber rod lead test assembly and evaluates the safety issues associated with tritium-producing burnable absorber rod irradiation on the operation of a commercial light water reactor. The report provides an evaluation ...

... electrode surface by an oxide laxcr in as much as the ... would exceed the diffusion current associated with the transport of absorbed deuterium 6 ...

The design of control rods for nuclear reactors are described. In this design the control rod consists essentially of an elongated member constructed in part of a neutron absorbing material and having tube means extending therethrough for conducting a liquid to cool the rod when in use.

Rhodopsin lateral diffusion was measured at three points along the axis of frog outer segments using the method of absorbance recovery after photobleaching. Mean recovery times were slightly longer in distal disk membranes than in proximal disks. A small reduction of pigment mobility with disk age may reflect subtle changes in membrane composition.

The results of two months' experimcets, carried out at low power following the first divergence (July 4, 1957) are presented. These experiments dealt with the following points: comparison of experimental and calculated values of the critical size, effects due to the introduction of absorbing materials into the principal experimental facilities; flux ...

Environmental Policy Act NERL National Environmental Radiation Laboratory NESHAPs National Emission Standards/FS Remedial Investigation/Feasibility Study RHIC Relativistic Heavy Ion Collider ROD Record of Decision RPD absorbance measured. B Beta Radiation - Beta radiation is composed of particles which are identical

Disclosed are a method and apparatus for regulating and shutting down a gas cooled nuclear reactor having a bed of spherical fuel elements, wherein regulation of the reactor is accomplished by a first set of absorber rods in the side reflector of the reactor, partial shutdown is achieved by a second set of absorber ...

A Yankee prototype, 80% silver-15% indium-5% cadmium alloy. control-rod absorber section was manufactured in accordance with procedures and specifications recommended for making 24 similar control-rod absorbers for the Yankee Core I. Fabrication information is presented in detail. (auth)

A displacer rod for use in a mechanical spectral shift pressurized water nuclear reactor comprises a sectioned substantially hollow low neutron absorbing metal rod capable of displacing reactor coolant without absorbing a high amount of neutrons. The tubular sections can be made of stainless steel or Zircaloy ...

A control element for nuclear reactors is designed which consists of a single flexible rod. The rod made of neutronabsorbing materials is shaped so that it becomes flexible due to the elasticity of the neutron-absorbing material. This can be achieved by using a neutron-absorbing tube that has slits. The slits are ...

An experiment was conducted in the SRE to measure temperatures and neutron flux levels in and near a boron-containing simulated control rod. The data are being used to check analytical methods developed for prediction of control rod heat generation rates and maximum temperatures in this type of control ...

This patent describes an auxiliary shock absorber assembly adapted to be secured to the frame of a vehicle and to the vehicle suspension system for providing additional shock absorption in the event of the vehicle impacts an irregularity in the roadway. The assembly comprises a shock absorber having a piston rod extending from one end ...

A control element drive mechanism is a reactor regulating system, which is to insert, withdraw, or maintain a control rod containing neutron-absorbing material within a reactor core to control the reactivity of the reactor. The ball-screw type CEDM for the small and medium research reactor has a spring-hydraulic damper to reduce the impact force due to the ...

Core designs currently performed by Commonwealth Edison (Edison) utilize a two-dimensional (x-y) fine-mesh neutron diffusion code that was converted from the Westinghouse TURTLE code. Due to the recent implementation of the Westinghouse VANTAGE 5 fuel assembly, which features axial blanket and part-length burnable absorbs in the Byron, Braidwood, and Zion nuclear reactors, and ...

This patent describes a nuclear reactor including nuclear core which is cooled and moderated by light water, the nuclear core comprising a plurality of parallel arranged openings therethrough and interspersed among the fuel assemblies. A control rod cluster arrangement comprises load follow control rod cluster assemblies with each load follow control ...

The gamma heat of an aluminum rod cooled at one end was determined at various positions in the radiation field of the Munich Research Reactor. The gamma energy absorbed per gram could be investigated by measuring the temperature distribution along the rod by means of the thermal conductivity of the material. ...

... as a dynamic absorber when attached to the ... Descriptors : *SHOCK ABSORBERS, *AIRFRAMES ... BEAMS(STRUCTURAL), VIBRATION ISOLATORS ...

A hydraulic shock absorber of the dash pot kind for use with electrically conducting liquid such as sodium, has magnet means for electro magnetically braking a stream of liquid discharged from the cylinder. The shock absorber finds use in a liquid metal cooled nuclear reactor for arresting control rods.

A thermocouple device for measuring the temperature of a flowing fluid in a conduit within which is positioned a metallic rod is presented. A thermocouple junction is secured to the rod centrally, and thermal insulating support disks having a diameter greater than the rod are secured to the end portions of ...

This physics assessment is based on roughly 300 control rod worth measurements in ZPPR from 1972 to 1981. All ZPPR assemblies simulated mixed-oxide LMFBRs, representing sizes of 350, 700, and 900 MWe. Control rod worth measurements included single rods, v...

The purpose of this study was to determine selenium levels in the urine of Tinea patients before and after overnight application of a 2.5% selenium sulfide lotion. Selenium was measured by atomic absorption spectroscopy (AAS). Hydride generation and carbon rod atomization were studied. It was concluded from this study that selenium is ...

In order to avoid a graduated variation of the reactivity from the reactor zones occupied by control rods to the zones not so occupied, control rods are provided each passing through the whole length of the reactor core and occupying this whole length in all positions. The rod, comprising neutron absorbent ...

... CRANKSHAFTS AND CONNECTING RODS ... purposes. The results indicate that the measurement of stresses in connecting rods is feasible. ...

A nondestructive measurement on avererage burnup of irradiated fuel rods with use of Ge(Li) detector

... motion of the AFRRI-TRIGA pulse reactor ... its effect on the reactor pulse are ... Descriptors : *RESEARCH REACTORS, *CONTROL RODS, REACTOR ...

The guided electromagnetic waves that propagate along a lossless dielectric ... measurable properties of electromagnetic waves guided by a dielectric rod in ...

This paper was presented to the American Nuclear Society meeting in Washington, D. C. on Dec. 11, 1956. A method is presented for the calculation of control rod worths by a combination of perturbation and transport theory. The perturbation theory finds the reactivity effect of absorber in the shape of the control rod. The ...

The UV measurements of the Venus atmosphere absorbers constrain the location, altitude, and identity

Measurement data are presented from a series of criticality experiments on systems simulating fuel element shipping containers and fuel storage basins. The conditions investigated involve clusters of 4.29 wt % /sup 235/U enriched UO/sub 2/ fuel rods immersed in water. The number of rods required for criticality in a square lattice ...

Canada deuterium uranium (CANDU-6) reactors are made of 380 pressure-tube channels surrounded by heavy water moderator. The pressure tubes are horizontal, but most of the reactivity devices are moved vertically. These include light-water zone controllers, adjuster rods, and mechanical control absorbers. In-core platinum and vanadium self-powered detectors ...

The excess reactivity available in an operating pile is absorbed in poison columns and horizontal rods. The temperature distribution of the pile is determined by the relative strengths and locations of the poison columns and the configuration of control rods used. A method for adjusting poison columns and rods to ...

Experimental data for creating an X-ray source several millimeters in size on the basis of a plasmafilled rod-pinch diode are reported. Experiments are carried out on the MIG high-current generator. A voltage pulse applied to the diode is sharpened and shortened by injecting plasma into the interelectrode gap up to the plasma-filled diode. Radiation extraction from the vacuum ...

In-bundle and out-of-bundle (single rod) nondestructive examinations of Light Water Breeder Reactor fuel rods were performed. In-bundle examinations included visual examination and measurement of rod bow, rod-to-rod gaps, and rod removal forces. Out-of-bu...

Hydriding and swelling of absorber material have been determined as the causes of cracks and bulges in PWR control rods that use hafnium in stainless steel cladding as the control material. The objective of this effort was to determine the root causes of cracks and bulges in PWR control rods consisting of a hafnium ...

This paper describes the results of postirradiation examination and analysis by CORAL code for irradiation performance of CRM601 control rod, which was the 6th reloaded control rod with shroud type absorber pins for use in JOYO MK-II core. The detailed vi...

A reactor control rod which is housed entirely within the reactor structure and which gives improved neutron flux distribution is described. The device is made up of three rods of alternating "absorber" and "neutral" zones of material which can be moved with respect to each other so that the absorber and ...

A shock absorber is designed for absorbing a longitudinal impact shock at the end of a body, e.g., a reactor control rod. The absorber comprises a buffer member with one end projecting through the body and a tapered member attached to the other end. In operation, when an impact shock is applied to the ...

Specifically disclosed herein is a method and apparatus whereby a rod- like workpiece such as a cigarette rod is gauged by passing it between a beta radiation source and a radiation detector, and the sensitivity of the instrument to changes in the cross-sectional shape of the rod is minimized by placing a ...

It has been proposed that one of the Materials Testing Reactor (MTR) Cd rods be replaced with an Army Package Power Reactor (APPR) type rod, consisting of enriched B/sup 10/ dispersed in electrolytic Fe and clad with 304L type stainless steel. The change in worth of the control rod as a function of operation time for both ...

A reactor control rod, the neutron-absorbing effect of which increases gradually over its length, is patented. The rod is supported at one end and free at the other end, and its neutron-absorbing effect increases from a low value at the free end, which is inserted into the core of the reactor, to a high ...

The DAYton temperature CORrection model (DAYCOR) calculates the temperature correction that must be applied to the temperature measured by the VIZ radiosonde`s white rod thermistor to deduce the atmospheric temperature. The temperature correction calculation takes into account all the significant heat transfer processes that influence the temperature of ...

Safety surveillance is performed in horizontal control rod (HCR) channels to locate conditions which could slow or block rod travel. The findings guide the application of preventive measures to assure eventual rod motion impairment will not occur. Boresco...

An experimental investigation was undertaken in order to obtain information on the transport properties of turbulent flow through a wall subchannel of a rod bundle with roughened rods and a smooth channel wall. Detailed measurement values were obtained on...

Measurements of the flow velocity distribution, the wall shear stresses and the turbulent Reynolds stress were performed in the wall-subchannels of two rod bundles. The rod bundle with four parallel rods was arranged symmetrically in a rectangular channel...

A pumping method, principally for oil, allows the sucker rod to fall under gravity for the first part of the downward stroke, then decelerates the sucker rod to a slow rate of descent, so creating a pause in the sucker rod's motion. Shock-absorbing means are provided to eliminate the impulsive loadings ...

An arrangement is described for fuel rods in graphitemoderated reactors in which each rod is supported in a cage, thereby relieving the rods of undesirable stress, especially in vertical stacking, and allowing them to expand both longitudinally and radially. The cages must be made of heat-resistant and low ...

A control apparatus is described which operates entirely inside the reactor and which takes up little space in the inoperative position. The apparatus comprises rods or strips of neutron-absorbing material pivoted at their ends between the inoperative Position above the fuel rods and the operative position between the fuel ...

A design is given ior a control-rod drive for high temperature gas- cooled reactors. Each control rod is individually driven by means oi a rack and pinion at its lower end. The energy of the falling rod is absorbed through the use of a ball-nut-hydraulic cylinder arrangement. (C.J.G.)

An automatic safety rod for a nuclear reactor containing neutron absorbing material and designed to be inserted into a reactor core after a loss-of-flow. Actuation is based upon either a sudden decrease in core pressure drop or the pressure drop decreases below a predetermined minimum value. The automatic control rod includes a ...

An automatic safety rod for a nuclear reactor containing neutron absorbing material and designed to be inserted into a reactor core after a loss-of-core flow. Actuation is based upon either a sudden decrease in core pressure drop or the pressure drop decreases below a predetermined minimum value. The automatic control rod includes a ...

... Accession Number : AD0643859. Title : PRODUCTION ENGINEERING MEASURE FOR RUBY LASER RODS. Descriptive ...

... Accession Number : AD0629170. Title : PRODUCTION ENGINEERING MEASURE FOR RUBY LASER RODS. Descriptive ...

... Title : NONDESTRUCTIVE MEASUREMENT OF ZIRCONIUM OXIDE CORROSION FILMS ON IRRADIATED ZIRCALOY-CLAD FUEL RODS. ...

... Title : EVALUATION OF VARIABLES ON THE MEASUREMENT OF FUEL CONCENTRATION VARIATIONS IN NUCLEAR FUEL RODS. ...

If a two-state photochromic material is optically bleached, the absorbance spectrum data measured by

The neutron coincidence counter has been field tested and evaluated for the measurement of boiling-water-reactor (BWR) fuel assemblies at the ASEA-ATOM Fuel Fabrication Facility. The system measures the /sup 235/U content per unit length of full fuel assemblies using neutron interrogation and coincidence counting. The /sup 238/U content is ...

The patent is concerned with cases in which an additional site- concentrated neutron flux peak must be compensated. For this purpose it is proposed that a mass of neutron absorbing material be applied to the ends of control rods. (J.S.R.)

Reactor power on PFR is controlled by eleven neutron absorbing rods. They are held vertically above the core by electromagnets which, in turn, are mounted on motorised lead screws. Five of the rods are used as power control elements; five are used as shut...

A reactor shut-down arrangement is described. A neutron absorbing rod is held electromagnetically above the reactor. The rod is forced hydraulically into the reactor when an abnormal condition develops. The tube and rcd are stepped internally to provide radiation traps to prevent leakage. (T.R.H.)

New light-harvesting thin film supramolecular assemblies, consisting of rod-coil polymer nanocomposites as the light-absorbing energy donors and a randomly dispersed conjugated rigid-rod polymer as the energy acceptor, have been prepared and shown to exhi...

The radioactivity induced in PWR cluster control rods during reactor operation has been calculated using the computer programme ORIGEN. Neutron fluxes and spectrum conditions as well as the strongly shielded cross sections for the absorber materials Ag, I...

A study was made of the different methods used to reduce rapidly the output of a reactor: introduction of solid rods into the core or the addition of liquid poisons to the liquid moderators, increase of neutron leakage by displacement of the reflector, and release of compressed gas or absorbing liquid by fuses which are sensitive to excessive heat ...

Whereas data for the extinction of starlight in the visible show the interstellar grains must be partially hollow, data in the ultraviolet show the vesicular interiors must be irregular. In particular, the absorbing materials responsible for excess extinction over a band centered at about 2175 A are required to be concentrated in irregularly distributed chromophores with ...

The measurement of control rod strength in the Physical Constants Testing Reactor is described. Results of control rod strength measurements for the Experimental Gas Cooled Reactor are included. (J.R.D.)

A gage used to measure the mechanical point impedance of linear systems under harmonic excitation is described. Strain measurements are made at two different cross-sections of a conical gage rod. The gage rod is in contact with the object at its narrow en...

Currently, radiation dose in experimental tumored animals undergoing radioimmunotherapy trials is computed indirectly by assessing serial time-dependent biodistribution data, mean residence times and cumulated activities. These data are then used to calculate organ doses through the standard MIRD formalism. Substantial uncertainty in the absorbed organ doses are a result of ...

A control rod is described which permits continual variation of its absorbing strength uniformly along the length of the rod. The rod is fail safe and is fully inserted into the core but changes in its absorbing strength do not produce axial flux distortion. The control device comprises ...

A shock-absorbing device is described which may be attached to the lower end of a reactor control rod or at the bottom of a control rod or fuel-element channel. The device comprises a telescopic tubular housing containing a plunger with screw threads. If the control rod has enough kinetic energy, the ...

... In the rods the pigment which absorbs light is visual purple, a photolabile chromo- protein biochemically derived from vitamin A. No photolabile ...

absorb microwave energy. With this technology, the adjacent surfaces of alumina rods can be melted and welded together in less than three minutes using ...

... The depth of the quarter wave cavity is controlled by Indium bumps diameter. ... Pixel thermometer Absorbing mesh Silicon rod Indium bump Page 5. ...

In this series absorbable fixation devices (screws and rods) made of self-reinforced poly-L-lactide (SR-PLLA) were used to stabilize arthrodesis in rheumatoid arthritis. These fixation devices have been used mainly in the fracture treatment or in the fixation of osteochondral lesions or osteotomies in hallux valgus operations. In arthrodesis of ...

... landing gear shock absorbers run over the ground surface, the amount ... sideward sliding motion of outward slanted rod type main gear and ...

A profile of the relative density of charged particles in a beam is obtained by disposing a number of rods parallel to each other in a plane perpendicular to the beam and shadowing the beam. A second number of rods is disposed perpendicular to the first rods in a plane perpendicular to the beam and also shadowing the beam. ...

A high efficiency, laser diode pumped, compact solid state laser is described, comprising: a rare earth doped solid laser rod having a front end and a back end; a housing with means holding the laser rod in fixed position in the housing with its front end forward; a laser diode secured in the housing behind and in optical alignment with the ...

The present invention is directed to a semi-automatic rod examination gauge for performing a large number of exacting measurements on radioactive fuel rods. The rod examination gauge performs various measurements underwater with remote controlled machinery of high reliability. The ...

by the invar rod measurement system at the telescope as a function of ... Relative vertical height as measured by the invar rod; b) Mean temperature of the ...

... Accession Number : ADA071398. Title : Comparisons of K sub I c Measurements by the Short Rod and ASTM E 399 Methods. ...

The experiments described are a comparison of rod bump-period, rod oscillator, rod drop, and pulsed neutron methods normally used for measuring control element strength in a multiplying system. The results show the rod oscillator technique to be dependent on detector locations. It is ...

A description is given of a system for determing the absolute position of reactor control rods by detecting the position of magnetic material in the rod extension. The detector is a long slender coal (one leg of an Owen bridge), the inductance of whicb is varied as the hollow magnetic rod extension passes over it. The change ...

A shock-absorbing device is described for moving bodies such as reactor shutdown rods. The device is comprised of a plastically deformable tube coiled upon a plunger member. Energy is dissipated when the coiled tube is deformed and frictionally engages the plunger. (R.J.S.)

Hybrid nuclear reactor grey rods are described, wherein geometric combinations of relatively weak neutron absorber materials such as stainless steel, zirconium or INCONEL, and relatively strong neutron absorber materials, such as hafnium, silver-indium cadmium and boron carbide, are used to obtain the reactivity worths required to ...

Estimates and techniques that are valid to calculate the linear extrapolation distance for an infinitely long circular cylindrical absorbing region are reviewed. Two estimates, in particular, are put into consideration, that is the most probable and the v...

An Author Certificate has been issued for a combination shock-absorber and retracting gear for aircraft wheels, which consists of a cylinder with attachment brackets and unions for filling and emptying the working fluid, a piston and a rod with diffusers,...

The effects of the elasticity and mass of the supporting structure on a spring shock-absorber system were investigated using a one-dimensional model. A mathematical analysis is given of the problem, which leads to the conclusions that: when the rod is more flexible than the springs, the elastic energy stored in the spring is reduced because of the ...

The composite contiol rod described consists of an outer sheath of a material strongly absorbent foi slow neutrons and an inner core of a solid material capable of slowing fast neutrons that have passed through the sheath. The outer sheath of the composite rod may consist of a ferious alloy containing a small percentage of ...

1. Rod dark adaptations after a photoregenerating flash and quantum-equivalent 30 sec bleach are found to be in exact agreement, while the measured rhodopsin regenerations are grossly different. This finding confirms and clarifies "Rushton's paradox', the failure of the Dowling-Rushton equation (linking log sensitivity linearly with unregenerated ...

The complex dependence of the reactivity-time function {rho}(t) for the HERBE safety rods during reactor shutdown is determined by combining both previously obtained reactivity worth data {rho}(z) and measurements of safety rod trajectory z(t). The integral reactivity-time function of the safety rods {rho}(T), ...

The effect of fixed absorbers on the reactivity of pressurized water reactor (PWR) spent nuclear fuel (SNF) in support of burnup-credit criticality safety analyses is examined. A fuel assembly burned in conjunction with fixed absorbers may have a higher reactivity for a given burnup than an assembly that has not used fixed absorbers. ...

The design of volume-production H/sup -/ sources requires the knowledge of heat loads on the source components. The arc and filament heater power input to a 20 cm diameter x 23 cm long source can be 50 kW or higher, practically all of which is absorbed in the cooling water. Water flow calorimetry measurements were made to determine the heat loads on the ...

... to a radiation absorber which automatically and/or digitally controls the intensity of a radiation source by providing an absorbent measured fixed ...

... in materials which absorb electromagnetic energy in the ... design and build a system which measures ... The Dual Horn-Reflector Microwave Absorber ...

Reaction kinetics of solid absorbents with effluent gases typical of an HF chemical laser were measured. Measurements included the effects of gas pressure, absorbent temperature, extent of reaction, and mode of absorbent preparation and pretreatment. Abso...

This physics assessment is based on roughly 300 control rod worth measurements in ZPPR from 1972 to 1981. All ZPPR assemblies simulated mixed-oxide LMFBRs, representing sizes of 350, 700, and 900 MWe. Control rod worth measurements included single rods, various combinations of ...

The SM-2 core lifetime was calculated and stuck rod criteria formulated. The control system could shutdown the core under the most adverse conditions with any single rod stuck out. The one-half-inch Eu/sub 2/O/sub 3/ flux supressors adequately supressed the power spike at the bottom of the core. The nuclear effects of increasing the dimensione ...

A computational method to handle rod worth determinations in the Piqua core was developed In addition, the reactivity effect of the collapse of a dry thimble in the appropriate cases was determined. The rod worth calculations indicate a range of values for a single, central rod, fully inserted varying from slightly under 1% to ...

... Title : Effect of Integration Time on Precision of Absorbances Measured with a Diode Array UV-VIS Spectrophotometer. ...

... After drying and reexposure with heavy water vapor, nuclear reaction analysis was used to measure the distributions of absorbed moisture in ...

A storage rack in which a plurality of tubular shrouds are assembled together in a checkerboard arrangement, each shroud having side walls arranged to absorb sub-atomic particles such as neutrons. With this arrangement, spent atomic fuel rods may be assembled in the shrouds and also in the spaces which are surrounded by shrouds, so that each adjacent ...

A top mounted nuclear reactor diverse rodded shutdown system utilizing gas fed into a pressure bearing bellows region sealed at the upper extremity to an armature. The armature is attached to a neutron absorber assembly by a series of shafts and connecting means. The armature is held in an uppermost position by an electromagnet assembly or by pressurized ...

The RAM-6 code for calculation of parameters of the effective logarithmic boundary condition at the absorbent rod surface in reactor is suitably modified to work on IBM PC, the instructions for its usage are presented and capabilities of the personal cpmp...

A control system is given for a high fiux reactor incorporating an anti- scram control feature whereby a neutron absorbing control rod acts as a fine adjustment while a neutron absorbing shim rod, actuated upon a command received from reactor period and level signals, has substantially greater effect on the ...

A numerical experiment investigating interference of absorbing rods in a BN-600-type reactor using the BFS-24-16 critical assembly is considered. The experiment was carried out with two-dimensional KENT programm based on the grid solution technique of the...

An energy-absorbing device is designed for arresting a reactor control rod should its suspension means fail and it fall under gravity. The device comprises at least one roll of dimpled sheet attached in a casing to the lower end of the control rod and arranged to crumple in the direction of its axis on impact. (D.L.C.)