Abstract The SBO is defined as the events of Loss of Offsite Power (LOOP) combined by loss of dedicated Emergency Diesel Generators(EDGs) for each unit. The SBO can be also extended when the shared Diesel Generator (AAC-DG) is lost additionally. The Electrical Cross-tie (ECT) is the concept of sharing other unit’s dedicated EDG to the unit under extended SBO in the multi-unit NPP site. We re-evaluate the risk of the extended SBO with the ECT option in Single Unit PRA considering Multi-Unit Features. To get a more realistic estimation of Core Damage Frequency (CDF), we developed the KU-PRA model using the AIMS-PSA code. We examined the factor of redundancy of the AC sources on the CDF by adding additional EDGs to the reference KU-PRA Model. We developed methodology and modeling of the Electrical Cross-tie for Multi-units PRA considering Common Cause Failure, Human Reliability Analyses, Battery load shedding, and Occupancy factor.

中文翻译：

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多单元站点延长站停电电气交叉线风险分析

摘要 SBO 被定义为由每个单元的专用应急柴油发电机 (EDG) 损失组合而成的场外电源 (LOOP) 损失事件。当共享柴油发电机 (AAC-DG) 额外丢失时，SBO 也可以扩展。电气交叉连接 (ECT) 是将其他机组的专用 EDG 共享给多机组 NPP 场址中扩展 SBO 下的机组的概念。考虑到多单元特征，我们重新评估了在单单元 PRA 中使用 ECT 选项扩展 SBO 的风险。为了更真实地估计堆芯损坏频率 (CDF)，我们使用 AIMS-PSA 代码开发了 KU-PRA 模型。我们通过向参考 KU-PRA 模型添加额外的 EDG 来检查 CDF 上交流电源的冗余因素。