IEC TR 63335:2021
(Main)Nuclear power plants - Instrumentation and control systems, control rooms and electrical power systems - Specific features of small modular reactors and needs regarding standards
Nuclear power plants - Instrumentation and control systems, control rooms and electrical power systems - Specific features of small modular reactors and needs regarding standards
IEC TR 63335:2021 identifies a number of issues of particular importance to light water Small Modular Reactors (SMRs), which are not currently adequately addressed by existing IEC SC 45A standards, and that could be considered when revising existing publications or that could be the object of new work item proposals. Whether each of these issues will indeed be addressed, and if so in which publication, will be the decision of each SC 45A working group. Though there are a number of advanced Generation IV SMR projects underway, their specific needs are not covered by this document.
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IEC TR 63335 ®
Edition 1.0 2021-02
TECHNICAL
REPORT
Nuclear power plants – Instrumentation and control systems, control rooms and
electrical power systems – Specific features of small modular reactors and
needs regarding standards
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IEC TR 63335 ®
Edition 1.0 2021-02
TECHNICAL
REPORT
Nuclear power plants – Instrumentation and control systems, control rooms and
electrical power systems – Specific features of small modular reactors and
needs regarding standards
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 27.120.20 ISBN 978-2-8322-9331-7
– 2 – IEC TR 63335:2021 IEC 2021
CONTENTS
FOREWORD . 4
INTRODUCTION . 6
1 Scope . 8
2 Normative references . 8
3 Terms and definitions . 8
4 Abbreviated terms . 9
5 SMR specific features . 10
5.1 General . 10
5.2 Passive design features and systems . 10
5.3 Mutualised operation . 11
5.4 Optimised maintenance . 11
5.5 Mutualised plant systems . 11
5.6 Integrated designs . 11
5.7 Modular construction . 12
5.8 Staged construction . 12
5.9 Consideration of emerging technologies. 12
5.10 Designing for an international market . 12
5.11 Licensing in an international market . 13
5.12 New designs (versus evolutionary designs) . 13
5.13 Remote monitoring and support centres . 13
6 Recommendations to existing working groups . 14
6.1 WGA2: Sensors and measurement techniques . 14
6.1.1 Current portfolio . 14
6.1.2 Topics of interest . 14
6.1.3 WGA2 roadmap . 15
6.2 WGA3: I&C systems: architecture and system specific aspects . 16
6.2.1 Current portfolio . 16
6.2.2 Topics of interest . 16
6.2.3 WGA3 roadmap . 17
6.3 WGA5: Special process measurement and radiation monitoring . 18
6.3.1 Current portfolio . 18
6.3.2 Topics of interest . 18
6.4 WGA7: Functional and safety fundamentals of I&C and electrical power
systems . 19
6.4.1 Current portfolio . 19
6.4.2 Topics of interest . 19
6.4.3 WGA7 roadmap . 20
6.5 WGA8: Control rooms . 20
6.5.1 Current portfolio . 20
6.5.2 Topics of interest . 20
6.5.3 WGA8 roadmap . 21
6.6 WGA9: System performance and robustness toward external stress . 22
6.6.1 Current portfolio . 22
6.6.2 Topics of interest . 22
6.6.3 WGA9 roadmap . 23
6.7 WGA10: Ageing management of I&C and electrical power systems in NPPs . 24
6.7.1 Current portfolio . 24
6.7.2 Topics of interest . 24
6.8 WGA11: Electrical power systems: architecture and system specific aspects . 25
6.8.1 Current portfolio . 25
6.8.2 Topics of interest . 25
6.8.3 WGA11 roadmap . 26
7 Issues of interest not covered by existing working groups . 26
7.1 General . 26
7.2 Systems engineering . 26
7.3 Cross-disciplinary topics . 26
7.4 Safety justification frameworks . 27
Bibliography . 28
– 4 – IEC TR 63335:2021 IEC 2021
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
NUCLEAR POWER PLANTS –
INSTRUMENTATION AND CONTROL SYSTEMS,
CONTROL ROOMS AND ELECTRICAL POWER SYSTEMS –
SPECIFIC FEATURES OF SMALL MODULAR REACTORS
AND NEEDS REGARDING STANDARDS
FOREWORD
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IEC TR 63335 has been prepared by subcommittee 45A: Instrumentation, control and
electrical power systems of nuclear facilities, of IEC technical committee 45: Nuclear
instrumentation. It is a Technical Report.
The text of this technical report is based on the following documents:
Enquiry draft Report on voting
45A/1357/DTR 45A/1371/RVDTR
Full information on the voting for the approval of this technical report can be found in the
report on voting indicated in the above table.
The language used for the development of this Technical Report is English.
This document was drafted in accordance with ISO/IEC Directives, Part 2, and developed in
accordance with ISO/IEC Directives, Part 1 and ISO/IEC Directives, IEC Supplement,
available at www.iec.ch/members_experts/refdocs. The main document types developed by
IEC are described in greater detail at www.iec.ch/standardsdev/publications.
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