NUCLEAR TECHNIQUES, Volume. 45, Issue 12, 120604(2022)

Reliability numerical simulation for startup time and startup failure of cold redundancy system in nuclear power plant

Shaoxuan WANG1,2, Zhixian LIN1,2, Daochuan GE1、*, Jie WU1, and Jie YU1
Author Affiliations
  • 1Institute of Nuclear Energy Safety Technology, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei 230031, China
  • 2University of Science and Technology of China, Hefei 230026, China
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    Background

    The startup time and startup-failure are widespread in most cold redundancy equipment of nuclear power plants (NPPs). The traditional static and dynamic fault tree cannot accurately model the startup time and startup-failure.

    Purpose

    This study aims to model the startup time and startup-failure behaviors in cold redundancy systems, and provide suggestions for the improvement of reliability assessment methods.

    Methods

    First, a DFT Monte Carlo simulation method was proposed for modeling and analyzing equipment's startup time and startup-failure behaviors in a cold redundancy system. Then, the emergency diesel generator set of the nuclear power plant was taken as an example, the distribution curve of system failure probability and the sensitivity of each component were obtained. Finally, the results were compared with the static fault tree method and traditional DFT method.

    Results

    1) The proposed method can model and analyze the start-up time and start-up failure behaviors of cold redundant equipment, reflecting the real failure scenarios and actual operation status of cold redundant systems. 2) The proposed method can accurately evaluate the system failure probability, identify highly sensitive equipment parameters in different time periods, and analyze the influence of start-up time on the system failure probability.

    Conclusions

    The proposed method has certain theoretical significance for the optimal design of NPP's cold redundancy systems.

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    Shaoxuan WANG, Zhixian LIN, Daochuan GE, Jie WU, Jie YU. Reliability numerical simulation for startup time and startup failure of cold redundancy system in nuclear power plant[J]. NUCLEAR TECHNIQUES, 2022, 45(12): 120604

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    Paper Information

    Category: Research Articles

    Received: Jun. 14, 2022

    Accepted: --

    Published Online: Jan. 3, 2023

    The Author Email: GE Daochuan (daochuan.ge@inest.cas.cn)

    DOI:10.11889/j.0253-3219.2022.hjs.45.120604

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