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PASCAL-ECを用いた減肉配管のフラジリティ評価

Fragility evaluation of wall-thinned pipes using PASCAL-EC

海老根 典也 ; 山口 義仁 ; 勝山 仁哉  ; 西田 明美  ; Li, Y. 

Ebine, Noriya; Yamaguchi, Yoshihito; Katsuyama, Jinya; Nishida, Akemi; Li, Y.

減肉配管のフラジリティ評価を行うため、減肉配管の構造健全性をモンテカルロ法により評価する確率論的解析コードPASCAL-ECを改良し、地震応答応力の不確実性を考慮した確率論的モデル、減肉による地震応力の増加を考慮した簡易モデルおよび破壊評価モデル等の機能を導入した。それらの新たな機能及び改良したPASCAL-ECを用いた地震時減肉配管のフラジリティ試解析結果を報告する。

A probabilistic analysis code PASCAL-EC (PFM Analysis of Structural Components in Aging LWR - Erosion and Corrosion) have been improved for evaluating structural integrity of wall thinned pipes on the basis of the Monte Carlo method. In order to perform the fragility evaluation for wall-thinned pipes, several functions are introduced to PASCAL-EC in this work, such as probabilistic evaluation model to consider the uncertainty of seismic response stress, a simple evaluation model to considered the increase of the seismic stress due to wall thinning and failure evaluation methods for wall-thinned pipes. This paper provides some details of these models and preliminary results of fragility evaluation using improved PASCAL-EC code for wall-thinned pipes in nuclear power plants.

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