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概要

In this study, a structure of code and standard system for plant maintenance is discussed. And also where the guideline for leakage management, developed by the special research committee of Japan society of cenology (ISM), should occupy a position in the code and standard system is discussed. As a result of deration, it was concluded as follows. Iaintenance program for plant compone nts consists of two (2) parts, a regular program for dealing with ninor ageing and a special program for dealing with specific ageing degradations. andards for regular maintenance should be developed as OM guidelines. Codes for special maintenance hould be developed as fitness-for-service codes. he fitness-for-service code for pressure retaining components can be developed from the fo llowing -iewpoints,(2) Standards for regular maintenance should be developed as OM guidelines. Codes for special maintenanceshould be developed as fitness-for-service codes. (3) The fitness-for-service code for pressure retaining components can be developed from the followingviewpoints.a) How much a structural strength reduction can be accepted on a precondition of leak tightnessb) H ow much a leakage can be accepted on a precondition of sufficient structural strength. (4) The JSM draft guideline for leakage management is a rule developed from the viewpoint of the above b)and occupies a position in the fitness-for-service code system. On the contrary, JSME rules on fitness-for-service for nuclear power plants is a code developed from the viewpoint of the above a).

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