核电厂一回路边界逆止阀泄漏的安全分析

Safety Analysis of Check Valve Leakage on the Primary Loop of Nuclear Power Plant

核电厂一回路边界作为核电厂与环境间放射性物质屏蔽的第二道屏障起着保障核安全的重要作用，一回路边界上的逆止阀若发生泄漏则直接威胁到第二道屏障的安全运行。本文结合实际曾发生过的某核电厂一回路边界逆止阀泄漏故障，利用传统的确定论安全分析方法和目前广泛开展的概率安全分析方法，对核电厂一回路边界逆止阀泄漏故障进行安全评价，探讨该故障的具体风险，提出核电厂运行中针对此种故障需采取的应对措施及风险防范建议。

As the second barrier between the nuclear power plant and the environment, the primary loop boundary of the nuclear power plant plays an important role in ensuring nuclear safety. If the check valve on the primary loopboundary leaks, it directly threatens the safe operation of the second barrier. Based on the leakage fault of boundarycheck valve in primary circuit of a nuclear power plant, this paper evaluated the leakage fault of boundary checkvalve in primary circuit of nuclear power plant by using the traditional detemlinistie safety analysis method and theprobabilistie safety analysis method widely developed at present, discussed the specific risk of the failure, and put for-ward the operation of nuclear power plant. The countermeasures and precautions against risks for such failures wereput forward.