IEC 61468 : 1.0

NUCLEAR POWER PLANTS - IN-CORE INSTRUMENTATION - CHARACTERISTICS AND TEST METHODS OF SELF-POWERED NEUTRON DETECTORS

International Electrotechnical Committee

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FOREWORD
1 Scope and object
2 Normative references
3 Definitions and abbreviations
   3.1 Definitions
   3.2 Abbreviations
4 Self-powered neutron detectors - General
   characteristics
5 Mechanical structure and characteristics
6 Nuclear and electrical characteristics
7 Application recommendations
   7.1 Fluence rate mapping - core monitoring and
        surveillance
   7.2 Feedback control
   7.3 Core protection
   7.4 Classification
8 Design recommendations
   8.1 Background noise
   8.2 Time response
   8.3 Lifetime
   8.4 Mechanical design and electrical connection
9 Test methods
   9.1 Prototype testing
   9.2 Production tests
10 Detector calibration
   10.1 Absolute calibration
   10.2 Comparison calibration
   10.3 In-core calibration
   10.4 Calibration procedure
   10.5 Recommended calibration periods
Annex A (informative) Self-powered detector principles
      A.1 SPND response mechanisms
          A.1.1 - Beta decay (delayed response)
          A.1.2 - Neutron capture (prompt response)
          A.1.3 - Photoelectric effect (prompt response)
          A.1.4 - Compton effect (prompt response)
      A.2 Nature of SPND response
          A.2.1 - Thermal neutron interactions
          A.2.2 - Gamma interactions
      A.3 Detector burn-up life
      A.4 Self-powered detector operating characteristics
          A.4.1 - Vanadium emitter characteristics
          A.4.2 - Cobalt emitter characteristics
          A.4.3 - Rhodium emitter characteristics
          A.4.4 - Silver emitter characteristics
          A.4.5 - Platinum emitter characteristics
          A.4.6 - Hafnia emitter characteristics
      A.5 Self-powered detector assemblies
          A.5.1 - Light water reactor self-powered
                  detector assemblies
          A.5.2 - Typical heavy water reactor self-powered
                  detector assembly
Annex B (informative) State of the art of SPNDs on Russian
        designed reactors (VVER and RBMK)

Abstract

Applicable to in-core neutron detectors and instrumentation, designed for purposes that are important to safety, protection, control and information. Gives recommendations, requirements and guidance on selection of the type and characteristics of self powered neutron detectors which are used in different possible applications.