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Detection and sizing of underbead cracks using ultrasonic nondestructive examination

Description: Ultrasonic nondestructive examination (NDE) will detect three mil deep underbead cracks in welds joining thin walled iridium hemishells. A correlation was developed to relate the amplitude of the signal reflected from the crack with crack wall area. The observed cracks occur in the weld underbead in the arc taper area during encapsulation of /sup 238/PuO/sub 2/ pellets for thermoelectric generators used in deep space exploration.
Date: February 11, 1982
Creator: Scarbrough, J.D. & Wierzbicki, W.M.
Partner: UNT Libraries Government Documents Department
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Minimum Critical Values Study

Description: This report provides minimum critical values for various 30-cm water-reflected uranium and plutonium oxide and nitrate aqueous mixtures as calculated by the SCALE CSAS1X sequence using the 238-group ENDF/B-V neutron cross-section library. The minimum values were determined through parametric searches in one-dimensional geometry. The calculations have been performed to obtain the minimum values: critical volume and mass for spheres, critical radius for cylinders, critical thickness for slabs, an… more
Date: July 11, 2005
Creator: Fox, P.B.
Partner: UNT Libraries Government Documents Department
open access

CSER 97-004: PFP production denitration calciner system

Description: The plutonium stabilization program at the Plutonium Finishing Plant (PFP) includes conversion of acidic plutonium nitrate solution into plutonium oxide. Conversion is facilitated through use of a vertical calciner installed in Glovebox HC-23OC-2, which is located in RM 230C of this facility. This evaluation supports the Criticality Prevention Specification for the calcining process inside this glovebox. As the product of the calciner is a high density plutonium oxide, a number of limits are re… more
Date: September 11, 1997
Creator: Hillesland, K.E.
Partner: UNT Libraries Government Documents Department
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Peroxide process -- 234-5 Building

Description: The mechanical line being developed at Los Alamos is designed around the peroxide precipitation process. Development work, at that site, on this process has progressed to the point where actual plant equipment can be designed for future use. The process for converting the peroxide to a reducible fluoride is known. From the reduction step on, no change is necessary in the present process. The possibilities of a satisfactory peroxide process were recognized before design and construction of the R… more
Date: October 11, 1949
Creator: Groswith, C. T.
Partner: UNT Libraries Government Documents Department
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Computation Results from a Parametric Study to Determine Bounding Critical Systems of Homogeneously Water-Moderated Mixed Plutonium--Uranium Oxides

Description: This report provides computational results of an extensive study to examine the following: (1) infinite media neutron-multiplication factors; (2) material bucklings; (3) bounding infinite media critical concentrations; (4) bounding finite critical dimensions of water-reflected and homogeneously water-moderated one-dimensional systems (i.e., spheres, cylinders of infinite length, and slabs that are infinite in two dimensions) that were comprised of various proportions and densities of plutonium … more
Date: January 11, 2001
Creator: Shimizu, Y.
Partner: UNT Libraries Government Documents Department
open access

Advanced Ultrasonic Inspection Techniques for General Purpose Heat Source Fueled Clad Closure Welds

Description: A radioisotope thermoelectric generator is used to provide a power source for long-term deep space missions. This General Purpose Heat Source (GPHS) is fabricated using iridium clad vent sets to contain the plutonium oxide fuel pellets. Integrity of the closure weld is essential to ensure containment of the plutonium. The Oak Ridge Y-12 Plant took the lead role in developing the ultrasonic inspection for the closure weld and transferring the inspection to Los Alamos National Laboratory for use … more
Date: January 11, 2001
Creator: Moyer, M.W.
Partner: UNT Libraries Government Documents Department
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