核电厂内部水淹概率风险分析
Probabilistic Risk Analysis on Internal Flooding for NPP
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摘要: 福岛核事故后，外部灾害事件对核电厂安全的影响逐渐受到重视，而核电厂内部水淹是常见的一种重要灾害，可能导致核电厂发生严重事故，通常无法通过外部事件筛选分析筛除，需对此进行定量评估。本文在对核电厂水淹概率风险分析方法进行了大量研究的基础上，探讨了发生水淹对核电厂设计和运行的影响，提出了内部水淹风险的贡献项。结果表明：电气厂房和设备冷却水系统分别是对内部水淹导致的堆芯损坏频率贡献最大的厂房和水淹源，需在相关区域适当增加水淹防护措施并加强水淹探测及报警能力。Abstract: The influence of outside disaster to the nuclear power plant (NPP) is paid more and more attention after Fukushima accident, and internal flooding is one of the important and common disasters that may induce the severe accident and need to be analyzed. In this paper the effect of design and operation on NPP was discussed based on the study of flooding probabilistic risk analysis, and the contribution for internal flooding risk evaluation was put forward. The results show that electrical building is the most contribution building to the core damage frequency (CDF) induced by internal flooding, and equipment cooling water system is the most contribution water source to the CDF induced by internal flooding. Flood protection, detection and alarm measures in the related area are needed.
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Keywords:
- internal flooding ,
- flooding scenario ,
- probabilistic risk analysis ,
- disaster
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[1] HAF102—2016核动力厂设计安全规定[S]. 北京：中国国家核安全局，2016. [2] HAD102/17—2004核动力厂安全评价与验证[S]. 北京：中国国家核安全局，2004. [3] IAEA. SSG-3Development and application of level 1 probabilistic safety assessment for nuclear power plants[S]. Vienna: IAEA, 2010. [4] ASME/ANS. RA-Sa—2009Standard for level 1: Large early release frequency probabilistic risk assessment for nuclear power plant applications[S]. USA: The American Society of Mechanical Engineers, 2009. [5] EPRI. 1019194Guidelines for performance of internal flooding probabilistic risk assessment[S]. USA: EPRI, 2009. [6] EPRI. 1013141Pipe rupture frequencies for internal flooding probabilistic risk assessment[S]. USA: EPRI, 2006.
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