The second All-Ti loop, 1OOA loop H, was placed in operation for more than 400 hr with UO/sub 2/SO/sub 4/ solution at 250 deg C and -- 1000 psi. A fourth test of the mockup of the Zircaloy-2--stainless steel transition joint used in the HRT reactor vessel was completed. The joint and bellows functioned properly and were leaktight. The series of long-term runs at 200, 250, and 300 deg C with solution proposed for use in the HRT was concluded. Stainless steel and Ti stress specimens exposed during the latter 13,000 hr of these tests gave no evidence of stress-corrosion …
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The second All-Ti loop, 1OOA loop H, was placed in operation for more than 400 hr with UO/sub 2/SO/sub 4/ solution at 250 deg C and -- 1000 psi. A fourth test of the mockup of the Zircaloy-2--stainless steel transition joint used in the HRT reactor vessel was completed. The joint and bellows functioned properly and were leaktight. The series of long-term runs at 200, 250, and 300 deg C with solution proposed for use in the HRT was concluded. Stainless steel and Ti stress specimens exposed during the latter 13,000 hr of these tests gave no evidence of stress-corrosion cracking. Results of a study of the effect of heat treatment on corrosion of type 347 stainless steel are presented. Pretreatment of stainless steel for 100 hr at 250 deg C with oxygenated H/sub 2/O containing 100 or 200 ppm Cr/sup 6+/ as CrO/sub 3/ decreased initial weight losses on subsequent exposures to UO/sub 2/SO/sub 4/ solutions. Stress-corrosion cracking of stainless steel in UO/sub 2/SO/sub 4/ solutions is described. A number of alloys of Zr were corrosion tested in simulated HRT core solutions at 300 deg C. Type 347 stainless steel, surface hardened either by malcomizing or Thermospray 16-C, corroded excessively in UO/sub 2/SO/sub 4/ solutions. Hastelloy R-235, Multimet, and Timken 16-25-6 demonstrated a high degree of corrosion resistance to simulated core solution at 300 deg C. Under the sanne conditions types 431 and 414 stainless steel corroded excessively. Type 420 stainless steel hardened at 50 to 52 Rockwell C corroded badly in 90 deg C UO/sub 2/SO/sub 4/ solution of the composition used in in-pile loops. (W.L.H.)
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Griess, J. C.; Savage, H. C.; English, J. L.; Ulrich, W. C.; Buxton, S. R.; Neumann, P. D. et al.Solution Corrosion Group Quarterly Report for the Period Ending July 31, 1957,
report,
July 31, 1957;
Oak Ridge, Tennessee.
(https://digital.library.unt.edu/ark:/67531/metadc1022622/:
accessed May 21, 2026),
University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu;
crediting UNT Libraries Government Documents Department.
