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Application of PAA in EPR Nuclear Power Units

Volume 15, Number 1, January 2019, pp. 13-22
DOI: 10.23940/ijpe.19.01.p2.1322

Wen Chen, Zhiwu Wang, Chen Qing, Shijun Chen, Jiefei Chen, Yu Chen, Hong Jiang, and Tao Zhang

CGN/Suzhou Nuclear Power Research Institute, Shenzhen, 518028, China

(Submitted on September 6, 2018; Revised on October 9, 2018; Accepted on November 17, 2018)


Forced unavailability of units not only influences economic indicators of nuclear power units like availability, but also seriously threatens the safe operation of units. It is significantly important for the safety and economy of nuclear power units to reduce forced shutdown times and shorten forced shutdown times of nuclear power units. In this paper, on the basis of European Pressurized Water Reactor (EPR) units for the third generation nuclear power, the application of VVP and ARE systems in EPR units is studied based on the Probabilistic Availability Assessment (PAA) method. Critical failure modes that influence forced unavailability of units are determined by Failure Mode and Effect Analysis (FMEA). Based on this, the unplanned shutdown time that influences unit availability is calculated, whether the unplanned unavailability of EPR units can meet the requirements is evaluated, critical weaknesses are identified, and methods of optimization are put forward. The results are a good reference for design and research, system configuration, and equipment selection of newly-built nuclear power units, and they also provide referable opinions and suggestions for improving the reliability of existing nuclear power units.


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