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概要

Pipe wall thinning caused by FAC (Flow Accelerated Corrosion) and LDI (Liquid Droplet Impingement)is managed through the measurement of pipe wall using UT (Ultrasonic Test) and the replacement of thinning element until reaching allowable limit in order to prevent pipe failure in Japan. Minimum wall thickness of design codes is applied to the allowable limit of pipe wall thinning management. On the other hand, the thinning area is localized in pipe wall caused by FAC and LDI, so the integr ity of piping system is maintained even if pipe wall thickness becomes smaller than design requirement to some extent. This kind of concept is already introduced to overseas codes and a non-nuclear domestic code. This paper investigates these cod es that introduce local thinning criteria and clarifies the difference among them, then studies how the introduction of local thinning criteria affects the pipe wall thinning management and addresses the issues to apply them to the codes in Japan.

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