Fault Tree Reliability Analysis for Passive Medium Pressure Safety Injection System in Nuclear Power Plant

Lengshan Leng, Yun Liu

School of Energy and Environment, Southeast University, Nanjing, China.

DOI: 10.4236/epe.2013.54B051                

Abstract

Modern nuclear power plants, both newly designed generation 3 and existing generation 2 reactors, make use of passive safety systems for significant and measurable improvements in safety and reliability. Medium Pressure Safety Injection System (MP-SIS) in Tianwan Nuclear Power Plant is a typical and very important nuclear safety passive system. This paper discusses the reliability of MP-SIS on the basis of Fault Tree Analysis (FTA) with unavailability and Minimal Cut Set (MCS) calculated as two important indicators. The result illustrates that the passive MP-Safety Injection Tank barely contributes to the system’s unavailability and human interactions with Manual Valves and Motor Operated Valves have great negative impact on the reliability.

Keywords

Passive Safety System; MP-SIS; FTA; Unavailability; MCS

Conflicts of Interest

The authors declare no conflicts of interest.

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