Spent nuclear fuels are stored in dry storage canisters made of austenitic stainless steel. Canisters have a sensitivity to chloride-induced stress corrosion cracking since the storage places are located in coastal regions, and this environment gives a risk to generate pitting and crack development on the surface of canisters. Hence, this paper suggests an experimental method of pitting evaluation for austenitic stainless steel. Notched bar and compact tension specimens fabricated using AISI 304, 316 stainless steel are designed to simulate loads corresponding to residual stresses on the surface of canisters. Stress levels are calculated from 3 MPa to 300 MPa referred to as the experimental data of measuring residual stresses of canisters. For making chloride environments, the developed tester for evaluating CISCC is applied so notched bar and compact tension specimens are immersed into the brine of 5 % salinity and loaded by tightening a spring to give a constant load condition under 50 ^o^C temperature. Also, initial loads applied to each notched specimen are verified using finite element analysis in the same condition. As a result, amounts of pits and crack developments on specimens are measured along the notched radius and analysis of the pit-to-crack mechanism is carried out.


INVESTIGATION OF CHLORIDE-INDUCED STRESS CORROSION CRACKING FOR AISI 304/304L STAINLESS STEEL USING NOTCHED BAR SPECIMENS

Division / Sponsors: 
Pressure Vessels & Piping (PVP)


Paper Proceedings: https://asmedigitalcollection.asme.org/PVP/PVP2020/volume/83815

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