As stated in the External Events HRA EPRI guidance [Ref. 1], there are inherent differences from internal events PRA that impact the ability of operators to perform actions during an external event. "Although the process steps and concepts are the same for an external event PRA, a fire PRA and an internal (non-spatial) PRA, there are several key differences needing to be addressed in the development of an external event HRA. Differences include the impact of the initiating event on the site structures, systems, and components (SSCs). Other differences, such as procedures and the impact on timeline development, should also be considered." A damage context "hybrid approach" has been developed and utilized for Seismic Probabilistic Risk Assessment (SPRA) that takes advantage of the binning system developed in the EPRI guidance [Ref. 1], while also applying site and context-specific parameters. In addition, the hybrid approach does not provide overly conservative results, like some scaling and factor based methods. This paper describes the methodology of the Seismic and External Hazards (EH) HRA hybrid approach and provides an example of how it has been applied in a SPRA. This approach meets the Capability Category II quality requirements in Part 5 of the ASME/ANS PRA Standard RA-Sa-2009 [Ref. 2].
展开▼
机译：如《外部事件》 HRA EPRI指南中所述[Ref。 1]，内部事件PRA有一些固有的差异，会影响操作员在外部事件期间执行操作的能力。 “尽管外部事件PRA，火灾PRA和内部（非空间）PRA的过程步骤和概念相同，但是在开发外部事件HRA时仍需要解决几个关键差异。差异包括：启动事件对站点结构，系统和组件（SSC）的影响。还应考虑其他差异，例如程序和对时间表发展的影响。”已经开发了一种损害上下文“混合方法”，并利用EPRI指南中开发的分级系统将其用于地震概率风险评估（SPRA）[参考资料]。 1]，同时还应用网站和特定于上下文的参数。此外，混合方法不会像某些基于比例和基于因子的方法那样提供过于保守的结果。本文介绍了地震与外部危害（EH）HRA混合方法的方法，并提供了如何在SPRA中应用该方法的示例。此方法符合ASME / ANS PRA标准RA-Sa-2009第5部分中的功能类别II质量要求。 2]。
展开▼
