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  • IEC 62118:2000

    Withdrawn A Withdrawn Standard is one, which is removed from sale, and its unique number can no longer be used. The Standard can be withdrawn and not replaced, or it can be withdrawn and replaced by a Standard with a different number.
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    Nuclear reactor instrumentation - Pressurized water reactor (PWR) of VVER design - Monitoring adequate cooling within the core during shutdown

    Available format(s):  Hardcopy, PDF, PDF 3 Users, PDF 5 Users, PDF 9 Users

    Withdrawn date:  31-12-2021

    Language(s):  English - French

    Published date:  09-11-2000

    Publisher:  International Electrotechnical Committee

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    Table of Contents - (Show below) - (Hide below)

    FOREWORD
    INTRODUCTION
    1 Scope and object
    2 Normative references
    3 Definitions and abbreviations
    4 Operating conditions
          4.1 General
          4.2 Normal power operation
          4.3 Hot shutdown operations
          4.4 Abnormal and accident conditions
          4.5 Cold shutdown operations
    5 Measurement methods
          5.1 General
          5.2 RPV water level measuring devices
          5.3 RPV inlet/outlet pipe water level measuring
                 devices (systems as shown in figure 2)
          5.4 Core exit temperature sensing devices
    6 Instrumentation requirements
          6.1 General
          6.2 Differential pressure measurement
          6.3 Heated sensor measurement
          6.4 Ultrasonic liquid level measurement
          6.5 Temperature sensing devices
    7 Data processing
    8 Presentation of information
    9 Verification and calibration
    10 In-service testing and maintenance
    11 Qualification
    12 Documentation
    Annex A (informative) Events with potential core cooling
                          degradation at VVERs
    Annex B (informative) Plant operating states
    Figure 1 - PWR configuration: (VVER-440) - Horizontal
               steam generators
    Figure 2 - PWR configuration: (VVER-1000) - Horizontal
               steam generators
    Figure 3 - Water level measurement by differential pressure
               method for VVER 1000
    Figure 4 - Thermal-hydraulic considerations affecting water
               level measurements (VVER-1000 systems) at reduced
               inventory and reverse flow
    Figure 5 - Water level measurement by direct acting
               transmitter (VVER-1000 systems) at reduced
               inventory and reverse flow

    Abstract - (Show below) - (Hide below)

    Applies to pressurized water reactors (PWRs) of VVER design and presents the requirements for monitoring adequate cooling within the core during hot and cold shutdown conditions. Requirements are given for core cooling monitoring instrumentation to ensure the safe operation of VVERs during abnormal operation and during and after design basis accidents (DBA).

    General Product Information - (Show below) - (Hide below)

    Committee TC 45/SC 45A
    Document Type Standard
    Publisher International Electrotechnical Committee
    Status Withdrawn

    Standards Referencing This Book - (Show below) - (Hide below)

    IEC 61226:2009 Nuclear power plants - Instrumentation and control important to safety - Classification of instrumentation and control functions
    IEC 60980:1989 Recommended practices for seismic qualification of electrical equipment of the safety system for nuclear generating stations
    IEC 61343:1996 Nuclear reactor instrumentation - Boiling light water reactors (BWR) - Measurements in the reactor vessel for monitoring adequate cooling within the core
    IEC 60987:2007+AMD1:2013 CSV Nuclear power plants - Instrumentation and control important to safety - Hardware design requirements for computer-based systems
    IEC 61227:2008 Nuclear power plants - Control rooms - Operator controls
    IEC 60770:1984 Methods of evaluating the performance of transmitters for use in industrial-process control systems
    IEC 60911:1987 Measurements for monitoring adequate cooling within the core of pressurized light water reactors
    IEC 60737:2010 Nuclear power plants - Instrumentation important to safety - Temperature sensors (in-core and primary coolant circuit) - Characteristics and test methods
    IEC 60880:2006 Nuclear power plants - Instrumentation and control systems important to safety - Software aspects for computer-based systems performing category A functions
    IEC 60780:1998 Nuclear power plants - Electrical equipment of the safety system - Qualification
    IEC 61225:2005 Nuclear power plants - Instrumentation and control systems important to safety - Requirements for electrical supplies
    IEC 60964:2009 Nuclear power plants - Control rooms - Design
    IEC 60050-393:2003 International Electrotechnical Vocabulary (IEV) - Part 393: Nuclear instrumentation - Physical phenomena and basic concepts
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