Abstract
The degree of sensitization was determined for sensitized stainless steel specimens by means of the EPR (Electrochemical Potentiokinetic Reactivation) measurement. Their susceptibility to intergranular stress corrosion cracking (IGSCC) was also evaluated by means of CBB (Creviced Bent Beam) test in simulated BWR environment.
A good correlation was observed between the activation ratio, Ra (=maximum activation current/critical passivation current), in the EPR measurement and the maximum crack depth in the CBB test. The EPR measurement was qualified to be able to used for screening the IGSCC susceptibility of material in simulated BWR environment. The screening criterion of Ra=1% was determined on the basis of the high reliability and the good screening ratio.
