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概要

For the quantitative evaluation of importance of maintenance and management to the piping in the turbine system and the feedwater system, an evaluation method of the piping failure frequency due to wall thinning, one of the major aging phenomena in the secondary and BOP systems, were developed. Based on the uncertainty of the thinning rate, initial thickness and material strength, frequency of the piping failure was evaluated probabilistically. As a trial evaluation, the difference of the failure frequency between the main steam system and the feedwater system was evaluated under assumption of no wall thinning management.

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