The predicted effectiveness of noble metal treatment at the Chinshan boiling water reactor

[[abstract]]The technique of noble metal treatment, such as noble metal coating or noble metal chemical addition, accompanied by a low level hydrogen water chemistry (HWC), is being employed by a U.S. nuclear power plant for mitigating intergranular stress corrosion cracking in the vessel internals of its boiling water reactor (BWR). A computer model named as DEMACE was employed to theoretically predict the effectiveness of noble metal treatment throughout the primary heat transport circuit (PHTC) of the Chinshan BWR in Taiwan. The effectiveness of noble metal treatment is justified by the electrochemical corrosion potential (ECP) prediction around the entire PHTC. In calculating ECP, certain enhancing factors for the exchange current densities of major redox reactions, available from recently published literature data, are employed in the current study. It is found that the effectiveness of noble metal treatment in the PHTC of the Chinshan BWR varies from region to region. In particular, this technique may have a negative impact on regions near the core outlet.[[fileno]]2060136010008[[department]]工程與系統科學