核电厂 仪表系统 压水轻水堆堆芯充分冷却监测测量

[中文适用范围]： IEC 60911:2025适用于加压水堆（PWR），并提出了在所有运行情况下（包括正常和异常运行）对堆芯内充分冷却进行监控的要求。本文件还包括在超出设计基准事故的条件下（即A类或B类设计扩展工况）对堆芯冷却监控的要求。本文件定义了用于测量冷却剂参数的仪表要求，这些参数在冷却剂出现单相或双相异常情况，或在反应堆压力容器（RPV）中包含气体时具有重要意义。本版取消并替代了1987年发布的首版。与前一版相比，本版包括以下重大技术变更：a) 标题的修改；b) 将IEC 62117:1999中关于冷停堆期间堆芯冷却监控的内容进行整合和合并；c) 整合了2011年福岛核事故后的反馈。 [外文原描述]： IEC 60911:2025 applies to pressurized water reactors (PWRs) and presents requirements for the monitoring of adequate cooling within the core in all operations, including normal and abnormal operations. Requirements for core cooling monitoring during conditions beyond a design basis accident, i.e. a design extension condition of type A or type B, are also covered in this document. This document defines requirements for instrumentation to measure coolant parameters, which are of interest when abnormal conditions arise with either one or two phases of coolant or with gas included in the reactor pressure vessel (RPV). This second edition cancels and replaces the first edition published in 1987. This edition includes the following significant technical changes with respect to the previous edition: a) Modification of the title. b) Integration and merging with the content of IEC 62117:1999 relative to the monitoring of core cooling during cold shutdown. c) Integration of feedback following the 2011 Fukushima accident.