IEC 61250:1994

Contents
Foreword
Introduction
Clause
1. Scope and object
2. Normative references
3. Definitions
4. Leakage classification and sources
    4.1 Leakage classification
    4.2 Potential identified leakage sources
5. General design and testing requirements
    5.1 Principal monitoring systems for unidentified
         leakage
    5.2 Coolant leakage detection system performance
    5.3 Safety classification
    5.4 Collecting and measuring identified leakages
    5.5 Monitoring intersystem leakage
    5.6 System availability
    5.7 Poert sources
    5.8 Design basis documentation
6. Specific leakage detection instrument requirements
    6.1 Sump level and/or sump pump discharge flow
         monitoring leakage detection
    6.2 Radiation monitoring leakage detection
    6.3 Containment air cooler condensate flow collection
         for leakage detection
    6.4 Reactor coolant inventory
    6.5 Humidity monitoring leakage detection
    6.6 Acoustic monitoring leakage detection
    6.7 Temperature monitoring leakage detection
    6.8 Reactor containment pressure monitoring
    6.9 Tape moisture sensors for leakage detection
    6.10 Visual observations
7. System operability requirements
Table 1 - Summary of leakage monitoring instrument
          capabilities

Defines the requirements for instrumentation needed to detect leakage from reactor coolant systems of light water nuclear reactors. Methods of leak detection are described, and characteristics of different methods of detection and of differentiating between allowable and abnormal leakages are given.