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

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.

General Information

Status
Published
Publication Date
25-Apr-2021
Current Stage
PPUB - Publication issued
Start Date
21-May-2021
Completion Date
26-Apr-2021
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IEC 61468
®

Edition 2.0 2021-04
INTERNATIONAL
STANDARD



Nuclear power plants – Instrumentation systems important to safety –
In-core instrumentation: Characteristics and test methods of self-powered
neutron detectors
IEC 61468:2021-04(en)

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IEC 61468

®


Edition 2.0 2021-04




INTERNATIONAL



STANDARD



















Nuclear power plants – Instrumentation systems important to safety –

In-core instrumentation: Characteristics and test methods of self-powered

neutron detectors

























INTERNATIONAL

ELECTROTECHNICAL


COMMISSION





ICS 27.120.20 ISBN 978-2-8322-9706-3




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® Registered trademark of the International Electrotechnical Commission

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– 2 – IEC 61468:2021 © IEC 2021
CONTENTS
FOREWORD . 4
INTRODUCTION . 6
1 Scope . 8
2 Normative references . 8
3 Terms and definitions . 8
4 Abbreviated terms . 12
5 Self-powered neutron detectors general advantages and disadvantages . 13
6 Composition and construction . 13
7 Application recommendations . 16
7.1 General . 16
7.2 Fluence rate mapping – Core monitoring and surveillance . 16
7.3 Power regulation – Feedback control . 16
7.4 Core protection .
...

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