OS0811 過大荷重に対する原子力プラント機器の健全性評価

Abstract

This paper introduces an example of structural integrity evaluation for Light Water Reactor (LWR) against excessive loads on Design Extension Condition (DEC). In order to assess the design acceptance level of DEC three acceptance criteria, stress basis of the current design code, strain basis and Load and Resistance Factor Design (LRFD) of strain basis were applied. As a result the acceptance level was increased by changing the acceptance criteria from the current stress based design code to strain based or LRFD. This means that there is possibility of practical sustainability of LWR on DEC.