IEC 60911:2025 pdf download, Nuclear power plants – Instrumentation systems – Measurements for monitoring adequate cooling within the core of pressurized light water reactors.

IEC 60911:2025 pertains to pressurized water reactors (PWRs) and outlines the requirements for monitoring adequate core cooling during all operational phases, including both normal and abnormal conditions. It also addresses the monitoring requirements for core cooling in scenarios that exceed design basis accidents, specifically design extension conditions of type A and type B.

This document specifies the necessary instrumentation for measuring coolant parameters, which are critical when abnormal situations occur, whether involving one or two phases of coolant or the presence of gas within the reactor pressure vessel (RPV).

The second edition of this standard supersedes the first edition published in 1987 and incorporates several significant technical updates compared to the earlier version: a) A revised title. b) The integration and consolidation of content from IEC 62117:1999 concerning core cooling monitoring during cold shutdowns. c) The incorporation of lessons learned and feedback from the 2011 Fukushima disaster.