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- W4252195093 abstract "Circumferential cracks detected in the JPDR (BWR) near welded joints connecting the nozzle safe-end to pipe (austenitic stainless steel) were studied in reference to the stresses applied in service, the conditions of welding, environment (O2 and Cl− concentration, water flow, temperature etc.), metallurgical structure and operating records, to determine the cause of cracking. Fatigue tests were also undertaken with simulated welded pipe of size to examine possible contribution of fatigue to the cracking. The analysis indicated stress corrosion to be the principal cause of cracking, and that it had initiated in the heat-affected zone which had been sensitized by the excess heat input of welding. The factors contributing to the stress corrosion were the presence of oxygen in the fluid, which had at times attained a level exceeding 0.2 ppm, and which combined with stress, at times exceeding the yield strength. This had caused the cracks once initiated, to propagate along the grain boundary." @default.
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- W4252195093 date "1979-01-01" @default.
- W4252195093 modified "2023-09-25" @default.
- W4252195093 title "Piping Cracks in JPDR, (IV)" @default.
- W4252195093 doi "https://doi.org/10.3327/jnst.16.137" @default.
- W4252195093 hasPublicationYear "1979" @default.
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