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ANP QUARTERLY PROGRESS REPORT kw at a pressure drop of 50 Ib, 10 kw at 5 Ib, d 5 kw at approximately 1 Ib. Since the maximum at removal required is expected to be no more an 10 kw, the heat exchanger appears to be more CREEP AND STRESS-CORROSION TESTS avis J. C. Wilson N. E. Hinkle J. C. Zukas Solid State Division stress-corrosion apparatus described pre- s has been bench tested. The design ap- o be sound, and therefore a new rig is being canned for insertion in the LITR. Temperature control to within 52°F at 150OOF has been achieved by using a Speedomax air-controller to drive the that supplies the furnace power. Operation riods of 500 hr has shown that, if sodium distills out of the hot zone of the furnace, so little sodium is lost that its effectiveness as a heat 'W. W. Davis et al., ANP Qwr. Prog. Rep. Sept. 10, 1954, ORNL-1771, p 142. .t transfer agent is not diminished. Welding of some t joints has been poor, and therefore Dy-Chek is being used in the inspection of all new welds. The LITR Experiment Review Committee has ape proved the apparatus for irradiat necessary safety circuit for the LITR has been completed. In the bench tests the outside of t was in air,rather than in sodium as it would be in the in-pile apparatus. The tests were for periods of 432 and 866 hr at 15OOOF and a stress of 1500 psi. The specimen exposed for the longer time showed roughly twice as many voids per unit area on the sides of the tube stressed in tension and compression as there were on the sides at zero stress. The maximum depth of voids was about 0.001 in. It was also noticed that the etching (or perhaps staining) characteristics of the salt-metal interface were not the same for the stressed and unstressed regions when etched in aqua regia. The reproducibility of the creep data obtained was not good, and therefore the specimen shape has been modified in order to concentrate more of the * . Fig. 9.5. Sandwich-Type U0,-Stainless Steel Fuel Element After 29% Burnup in MTR S Nize, 3p). 250X. 126 . 1 1
creep deformation in the gage length. A specimen tube with thicker walls will be used, and the wall thickness will be reduced only at that part of the tube which is in contact with the fused salt. This modification should greatly increase the accuracy of creep measurements. The MTR creep test equipment is being bench tested prior to shipment to NRTS. REMOTE METALLOGRAPHY M. J. Feldman R. N. Ramsey W. B. Parsley A. E. Richt Solid State Division Two additional Pratt & Whitney Aircraft capsules, each containing sandwich-type U0,-stainless steel fuel elements, were opened, and the elements were examined metallographically. The stainless steel- UO, particle size was less than 3p for one capsule, and it was between 15 and 44p for the other. The capsules were irradiated at a temperature of about 5OO0F, and the total burnup for each capsule was 2%. Comparison of the results from the element PERIOD ENDING DECEMBER 10, 7954 with 3-p particle size and the element with 15- to 44-p particle size showed that irradiation induced greater final hardness in the elements with the smaller-particle-size material (Figs. 9.5 and 9.6). Four samples from the smaller-particle-size elements showed cracking of the core without bending. Since cracking did not occur in elements with lower total burnups, it appears that the increased burnup (29%), together with the small partic:le size, can cause cracking of the core, as illustrated in Fig. 9.5. MASS SPECTROGRAPHIC ANALYSElS R. Baldock Stable Isotope Research and Production Division The isotope dilution method has been used during the last one and one-half years for analyzing ARE- type (NaF-ZrF,-UF,) fuels for their uranium con- tent.' As a result of this experience, a need was 'L. 0. Gilpatrick and J. R. Sites, Stable Isotope Re- search and Production Semiann. Prog. Rep. May 20, 19.54, ORNL-1732, p 24. Fig. 9.6. Sandwich-Type UOp-Stainless Steel Fuel Element After 29% Burnup in MTR and a Bend Test (UO, Particle Size, 15 to 441.1). 250X. 127
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