IEC 63186:2021

IEC 63186 ®
Edition 1.0 2021-08
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Nuclear power plants – Instrumentation and control systems important to safety
– Criteria for seismic trip system

Centrales nucléaires de puissance – Systèmes d'instrumentation et de contrôle-
commande importants pour la sûreté – Critères pour système de protection
sismique
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IEC 63186 ®
Edition 1.0 2021-08
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Nuclear power plants – Instrumentation and control systems important to safety

– Criteria for seismic trip system

Centrales nucléaires de puissance – Systèmes d'instrumentation et de contrôle-

commande importants pour la sûreté – Critères pour système de protection

sismique
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 27.120.20 ISBN 978-2-8322-1011-7

– 2 – IEC 63186:2021 © IEC 2021
CONTENTS
FOREWORD . 3
INTRODUCTION . 5
1 Scope . 7
2 Normative references . 7
3 Terms and definitions . 8
4 Abbreviated terms . 9
5 General considerations . 10
5.1 Purpose . 10
5.2 Decision issues for the seismic trip system implementation . 10
5.3 Categorization and classification . 11
5.4 Multi-unit station consideration . 11
6 System design requirements . 11
6.1 General . 11
6.2 Seismic design requirements . 11
6.3 System architecture . 11
6.4 Mounting locations . 12
6.5 Tripping variable . 12
6.6 Triggering level and trip set-point . 12
6.7 Interface requirements . 13
6.8 Human machine interface . 13
6.9 Requirements for digital technology application . 13
6.10 Environmental conditions . 13
6.11 Design provisions for maintenance and testing . 14
6.12 Power requirements . 14
7 Component design requirements . 14
7.1 General . 14
7.2 Acceleration sensor requirements . 14
7.2.1 Performance requirement . 14
7.2.2 Installation considerations . 14
7.3 Signal processing component . 15
7.4 Logic component requirements . 15
8 Qualification requirements . 15
8.1 General . 15
8.2 Environmental qualification . 15
8.3 EMC qualification . 16
8.4 Seismic qualification . 16
Annex A (informative) Implementation examples of the seismic trip system . 17
A.1 The design of the seismic trip system in CAP1400 . 17
A.2 The IAPS in a VVER plant . 19
A.3 The seismic trip system in a French research reactor . 19
Bibliography . 20

Figure A.1 – System diagram of ESS system . 18

INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
NUCLEAR POWER PLANTS – INSTRUMENTATION
AND CONTROL SYSTEMS IMPORTANT TO SAFETY –
CRITERIA FOR SEISMIC TRIP SYSTEM

FOREWORD
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IEC 63186 has been prepared by subcommittee 45A: Instrumentation, control and electrical
power systems of nuclear facilities, of IEC technical committee 45: Nuclear instrument
...