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oSIST prEN IEC 62397:2025

(Main)

Nuclear power plants - Instrumentation and control important to safety - Resistance temperature detectors

Nuclear power plants - Instrumentation and control important to safety - Resistance temperature detectors

IEC 62397:2022 describes the requirements for resistance temperature detectors (RTDs) suitable for applications in I&C systems important to safety of nuclear power plants. The requirements of RTDs include design, materials, manufacturing, testing, calibration, procurement, and inspection. RTDs used for safety applications in Nuclear Power Plants can be categorized into direct-immersed and thermowell-mounted RTDs.
This standard describes the requirements for the design, material selection, procurement, construction, and testing of resistance temperature detectors (RTDs) used in nuclear power plants (NPPs). These RTDs may be used in both the nuclear safety I&C systems and/or in the non-safety-related instrumentation systems.
This second edition cancels and replaces the first edition, published in 2007; it also cancels and replaces the first edition of IEC 61224:1993. This edition includes the following significant technical changes with respect to the previous edition.

Kernkraftwerke - Leittechnik mit sicherheitstechnischer Bedeutung - Widerstands-Temperaturfühler

Centrales nucléaires de puissance - Instrumentation et contrôle-commande importants pour la sûreté - Sondes à résistance

IEC 62397:2022 describes the requirements for resistance temperature detectors (RTDs) suitable for applications in I&C systems important to safety of nuclear power plants. The requirements of RTDs include design, materials, manufacturing, testing, calibration, procurement, and inspection. RTDs used for safety applications in Nuclear Power Plants can be categorized into direct-immersed and thermowell-mounted RTDs.
La présente norme décrit les exigences pour la conception, le choix des matériaux, l'approvisionnement, la fabrication et les essais des sondes à résistance (SR) utilisées dans les centrales nucléaires de puissance (CNP). Ces SR peuvent être utilisées dans les systèmes d'instrumentation et de contrôle-commande (systèmes d'I&C) liés à la sûreté nucléaire et/ou dans les systèmes d'instrumentation non liés à la sûreté.
Cette deuxième édition annule et remplace la première édition parue en 2007. Elle annule et remplace également la première édition de l'IEC 61224:1993. Cette édition inclut les modifications techniques majeures suivantes par rapport à l'édition précédente.

Jedrske elektrarne - Merilna in nadzorna oprema za zagotavljanje varnosti - Detektorji upora temperature

General Information

Status
Not Published
Public Enquiry End Date
31-Dec-2025
ICS
27.120.20 - Nuclear power plants. Safety
Technical Committee
I09 - Imaginarni 09
Current Stage
4020 - Public enquire (PE) (Adopted Project)
Start Date
16-Oct-2025
Due Date
05-Mar-2026
Ref Project
prEN IEC 62397:2025 - Nuclear power plants - Instrumentation and control important to safety - Resistance temperature detectors
oSIST prEN IEC 62397:2025oSIST prEN IEC 62397:2025
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oSIST prEN IEC 62397:2025
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Standards Content (Sample)


SLOVENSKI STANDARD
01-december-2025
Jedrske elektrarne - Merilna in nadzorna oprema za zagotavljanje varnosti -
Detektorji upora temperature
Nuclear power plants - Instrumentation and control important to safety - Resistance
temperature detectors
Kernkraftwerke - Leittechnik mit sicherheitstechnischer Bedeutung - Widerstands-
Temperaturfühler
Centrales nucléaires de puissance - Instrumentation et contrôle-commande importants
pour la sûreté - Sondes à résistance
Ta slovenski standard je istoveten z: prEN IEC 62397:2025
ICS:
27.120.20 Jedrske elektrarne. Varnost Nuclear power plants. Safety
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD DRAFT
prEN IEC 62397
NORME EUROPÉENNE
EUROPÄISCHE NORM
October 2025
ICS 27.120.20 -
English Version
Nuclear power plants - Instrumentation and control important to
safety - Resistance temperature detectors
(IEC 62397:2022)
Centrales nucléaires de puissance - Instrumentation et Kernkraftwerke - Leittechnik mit sicherheitstechnischer
contrôle-commande importants pour la sûreté - Sondes à Bedeutung - Widerstands-Temperaturfühler
résistance (IEC 62397:2022)
(IEC 62397:2022)
This draft European Standard is submitted to CENELEC members for enquiry.
Deadline for CENELEC: 2026-01-02.

The text of this draft consists of the text of IEC 62397:2022.

If this draft becomes a European Standard, CENELEC members are bound to comply with the CEN/CENELEC Internal Regulations which
stipulate the conditions for giving this European Standard the status of a national standard without any alteration.

This draft European Standard was established by CENELEC in three official versions (English, French, German).
A version in any other language made by translation under the responsibility of a CENELEC member into its own language and notified to
the CEN-CENELEC Management Centre has the same status as the official versions.

CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic,
Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the
Netherlands, Norway, Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Türkiye and the United Kingdom.

Recipients of this draft are invited to submit, with their comments, notification of any relevant patent rights of which they are aware and to
provide supporting documentation.

Warning : This document is not a European Standard. It is distributed for review and comments. It is subject to change without notice and
shall not be referred to as a European Standard.

European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2025 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Project: 82121 Ref. No. prEN IEC 62397:2025 E

European foreword
This document (prEN IEC 62397:2025) consists of the text of document IEC 62397:2022, prepared by
IEC/SC 45A “Instrumentation, control and electrical power systems of nuclear facilities” of IEC/TC 45
"Nuclear instrumentation".
This document is currently submitted to the Enquiry.
The following dates are proposed:
• latest date by which the existence of this document (doa) dav + 6 months
has to be announced at national level
• latest date by which this document has to be (dop) dav + 12 months
implemented at national level by publication of an
identical national standard or by endorsement
• latest date by which the national standards (dow) dav + 36 months
conflicting with this document have to be withdrawn (to be confirmed or
modified when voting)
As stated in the nuclear safety directive 2009/71/EURATOM, Chapter 1, Article 2, item 2, Member States
are not prevented from taking more stringent safety measures in the subject-matter covered by the
Directive, in compliance with Community law.
In a similar manner, this document does not prevent Member States from taking more stringent nuclear
safety and/or security measures in the subject-matter covered by this document.
Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any amendments) applies.
NOTE 1 Where an International Publication has been modified by common modifications, indicated by (mod),
the relevant EN/HD applies.
NOTE 2 Up-to-date information on the latest versions of the European Standards listed in this annex is available
here: www.cencenelec.eu.
Publication Year Title EN/HD Year
IEC 60068-2-6 2007 Environmental testing - Part 2-6: Tests - EN 60068-2-6 2008
Test Fc: Vibration (sinusoidal)
IEC 60068-2-30 2005 Environmental testing - Part 2-30: Tests EN 60068-2-30 2005
- Test Db: Damp heat, cyclic (12 h + 12
h cycle)
IEC 60751 2022 Industrial platinum resistance EN IEC 60751 2022
thermometers and platinum temperature
sensors
IEC/IEEE 60780- 2016 Nuclear facilities - Electrical equipment EN 60780-323 2017
323 important to safety - Qualification
IEC/IEEE 60980- 2020 Nuclear facilities - Equipment important EN IEC/IEEE 60980-344 2021
344 to safety - Seismic qualification

IEC 62397 ®
Edition 2.0 2022-11
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Nuclear power plants – Instrumentation and control important to safety –

Resistance temperature detectors

Centrales nucléaires de puissance – Instrumentation et contrôle-commande

importants pour la sûreté – Sondes à résistance

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 27.120.20 ISBN 978-2-8322-6045-6

– 2 – IEC 62397:2022 © IEC 2022
CONTENTS
FOREWORD . 4
INTRODUCTION . 7
1 Scope . 9
2 Normative references . 9
3 Terms, definitions and abbreviated terms . 9
3.1 Terms and definitions . 10
3.2 Abbreviated terms . 11
4 Design and construction requirements . 12
4.1 General . 12
4.2 Reliability . 12
4.3 Materials . 12
4.3.1 General . 12
4.3.2 Radiation dose to materials . 12
4.3.3 Resistance element material . 12
4.3.4 Seals and adhesives . 13
4.4 Connections . 13
4.4.1 Structural type . 13
4.4.2 Electrical connection . 14
4.4.3 Mechanical connection . 16
4.5 Manufacturing quality . 17
4.6 Ambient conditions (normal and accident operations) and qualification . 17
4.7 RTD performance. 18
4.7.1 General . 18
4.7.2 Accuracy . 18
4.7.3 Resistance temperature calibration . 18
4.7.4 Self-heating error . 19
4.7.5 Thermal response time . 19
4.7.6 Interchangeability . 20
4.7.7 Electrical insulation resistance . 20
4.7.8 Repeatability (thermal shock) . 20
4.7.9 Vibration . 20
4.7.10 Steam test . 21
4.7.11 Thermal cycling . 21
4.7.12 Dielectric inspection . 21
4.7.13 Hydraulic strength . 21
4.7.14 In situ response time testing . 21
4.8 Identification . 22
4.9 Failure mode and effects analysis . 22
5 Inspection and tests . 22
5.1 General . 22
5.2 Inspection and test failure . 23
5.3 Inspection and test reports . 23
5.4 Test method . 23
5.4.1 Assembly and appearance inspection . 23
5.4.2 Calibration procedure . 23
5.4.3 Self-heating test . 24

IEC 62397:2022 © IEC 2022 – 3 –
5.4.4 Thermal response time . 24
5.4.5 Insulation resistance test . 24
5.4.6 Repeatability test (thermal shock) . 24
5.4.7 Vibration test . 24
5.4.8 Steam test . 25
5.4.9 Thermal cycling . 25
5.4.10 Dielectric inspection test . 25
5.4.11 Hydraulic test . 25
5.4.12 In situ response time test . 26
5.4.13 Cross-calibration testing . 26
5.5 Production test . 27
5.6 Qualification test . 28
6 Documentation . 29
Annex A (informative) In situ response time test methods . 31
A.1 Loop current step response test (LCSR) . 31
A.2 Calculation of the response time by temperature noise (passive method) .
...

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