A number of SSRT tests were performed in order to determine best behaving stainless steel for fuel cladding for supercritical water at 550oC with regards to SCC resistance. The materials were limited to austenitic stainless steels which have a code case for reactor internal applications and have a relatively good general corrosion resistance in supercritical water below 550oC. The initial results indicated that SS 316L has good enough SCC resistance, but further tests on another heat of 316L showed adverse results. The former heat showed no SCC whereas the latter heat showed very high SCC susceptibility in as-received (mill-annealed) condition, shot peened condition and in as-received condition with a TIG weld in the middle of the gauge section of the SSRT specimen. Further electrochemical testing of the degree of sensitisation revealed that the heat giving good enough SCC resistance in SSRT test was also partially sensitised.
|Conference||7th International Symposium on Supercritical Water-Cooled Reactors, ISSCWR-7|
|Period||15/03/15 → 18/03/15|