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Vol.17 No.1previousAA183
Academic Articles
Regular Paper Vol.17 No.1 (2025) p.1 - p.14
 

Development of performance loss function for the importance analysis of inspection in terms of risk of safety performance of a piping system

 

Akihiro MANO1,*,Takuya SATO1,Masakazu ICHIMIYA1 and Naoto KASAHARA1

 
1 The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8654, Japan
 
Abstract
The inspection focusing on high-risk significant parts of a piping system is known as one of effective inspection methodologies. In nuclear power plants, the risk is defined for its safety performance that is protection from the harmful effect of radiation. On the other hand, investigation into another risk concept is performed in the field of structural integrity. The risk concept is defined for safety performance of a passive component, such as the boundary performance and cooling performance, as the failure consequence. However, the failure consequence on the safety performance is not sufficiently considered in analyses on the risk in the structural integrity field. The failure consequence is assumed to lose the safety performance completely or assumed to be negligible. In this research, we applied the concept of performance loss function that considers both of occurrence probability and failure consequence to the risk analysis for the effective inspections for a piping system. Its quantitative evaluation method for the piping system was developed. As an example of the risk analysis for inspection, the effect of inspection was quantified for a piping system using the developed evaluation methodology. The effectiveness of inspections based on the performance loss function was demonstrated.
 
Keywords
Inspection, Piping system, Core cooling performance degradation, failure consequence
 
Full Paper: PDF
Article Information
Article history:
Received 16 July 2024
Accepted 14 May 2025