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BS IEC 61468:2021

BS IEC 61468:2021

$167.15

Nuclear power plants. Instrumentation systems important to safety. In-core instrumentation: Characteristics and test methods of self-powered neutron detectors

Published By Publication Date Number of Pages
BSI 2021 38
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IEC 61468:2021 applies to in-core neutron detectors, viz. self-powered neutron detectors (SPNDs), which are intended for application in systems important for nuclear reactor safety: protection, instrumentation and control. This document contains SPND characteristics and test methods. In this document, the main sources of errors, and the possibilities for their minimization are also considered. This document contains requirements, recommendations and instructions concerning selection of SPND type and characteristics for various possible applications. This document about SPNDs uses the basic requirements of IEC 61513 and IEC 60568 and complements them with more specific provisions in compliance with IAEA Safety Guides. This second edition cancels and replaces the first edition, published in 2000, and its Amendment 1, published in 2003. This edition includes the following significant technical changes with respect to the previous edition:a. Title modified. b. Justify the requirements for SPND characteristics in terms of influencing factors. c. Align the terminology with the current state of the regulatory framework.

PDF Catalog

PDF Pages PDF Title
2 undefined
4 CONTENTS
6 FOREWORD
8 INTRODUCTION
10 1 Scope
2 Normative references
3 Terms and definitions
14 4 Abbreviated terms
15 5 Self-powered neutron detectors general advantages and disadvantages
Figures
Figure 1 – Typical integral self-powered neutron detector
Figure 2 – Typical modular self-powered neutron detector
16 Table 1 – Characteristics of SPND emitters
17 Figure 3 – Typical background detector
18 7 Application recommendations
7.1 General
7.2 Fluence rate mapping – Core monitoring and surveillance
7.3 Power regulation – Feedback control
7.4 Core protection
7.5 Reactor noise analysis
7.6 Classification
Figure 4 – Typical SPND with built-in background detector
19 8 Design recommendations
8.3 Background signal
8.4 Electrical interference noise
8.5 Lifetime
9 Test methods
9.1 General
20 9.2 Prototype testing
9.3 Production tests
10 Detector calibration
10.1 Place of calibration
21 10.2 Absolute calibration
10.3 Comparison calibration
10.4 In-core calibration
10.5 Calibration procedure
22 10.6 Recommended calibration periods
23 Annex A (informative)Self-powered detector principles and characteristics
A.1 SPND response mechanisms
A.2 Beta decay (delayed response)
A.3 Neutron capture (prompt response)
A.4 Photoelectric effect (prompt response)
A.5 Compton effect (prompt response)
24 A.6 Nature of SPND response
A.7 Thermal neutron interactions
A.8 Gamma interactions
A.9 Dynamic characteristics of SPND
25 A.10 Detector burn-up life
A.11 Measurement errors
A.11.1 General
A.11.2 Error for determination of SPND actual response
26 A.11.3 Error determined by gamma-component of SPND current
A.11.4 Error determined by leakage currents
27 A.11.5 Error determined by signal wire current
A.12 Self-powered detector operating characteristics
A.12.1 General
Figure A.1 – Simplified equivalent circuit of the SPND
28 A.12.2 Vanadium emitter characteristics
A.12.3 Cobalt emitter characteristics
A.12.4 Rhodium emitter characteristics
Table A.1 – Examples of specifications for typical SPNDs used in power reactors
29 A.12.5 Silver emitter characteristics
A.12.6 Platinum emitter characteristics
A.12.7 Hafnia emitter characteristics
30 A.13 Self-powered detector assemblies
A.13.1 General
A.13.2 Typical bottom-mounted rhodium self-powered detector assembly for pressurized light water reactors
A.13.3 Typical top-mounted rhodium self-powered detector assembly for VVER–type light water reactors
A.13.4 Typical top-mounted cobalt self-powered detector assembly for pressurized light water reactors
31 A.13.5 Typical heavy water reactor self-powered detector assembly
Figure A.2 – Bottom-mounted rhodium self-powereddetector assembly for pressurized water reactors
32 Figure A.3 – Top-mounted rhodium self-powered detector assemblyfor VVER reactors with four thermocouples
33 Figure A.4 – Top-mounted rhodium self-powered detectorassembly for VVER reactors with level sensor
34 Figure A.5 – Top-mounted cobalt self-powered detector assembly for pressurized water
35 Figure A.6 – CANDU pressurized heavy water reactor self-powered detector assembly
36 Bibliography

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BS IEC 61468:2021
$167.15