Abstract
After an introduction to the Japanese organization for safety regulations administration for commercial nuclear power plants, a review is made of historical changes in capacity factor, share percentage of electricity generated by nuclear power plants, and annual incidence of accident, trouble and deficiency. Next, the administrative organization for repair and replacement decisions for flawed structural components in plant is described. Finally the paper discusses two examples of research work carried out for the elucidation of the cause and mechanism of structural failures of splitter plates in PWRs and of bearing rings of hydrostatic bearing in a BWR.
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