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IEC 62765-2:2019

(Main)

Nuclear power plants - Instrumentation and control important to safety - Management of ageing of sensors and transmitters - Part 2: Temperature sensors

Nuclear power plants - Instrumentation and control important to safety - Management of ageing of sensors and transmitters - Part 2: Temperature sensors

IEC 62765-2:2019 identifies minimum requirements and applicable practices for correcting and preventing any potential impacts on nuclear power plant (NPP) safety due to the ageing of temperature sensors, such as NPP resistance temperature detectors (RTDs) and thermocouples (TCs).
This document provides strategies, technical requirements, and recommended practices for the management of the ageing of temperature sensors important to safety in nuclear power plants (NPPs) to ensure that ageing can be identified and that suitable remedial actions are undertaken as necessary to demonstrate that the safety of the plant will not be impaired. This document is aligned with IEC 62342, which provides guidance on ageing management for instrumentation and control (I&C) systems important to safety in NPPs

Centrales nucléaires de puissance - Instrumentation et contrôle-commande importants pour la sûreté - Gestion du vieillissement des capteurs et des transmetteurs - Partie 2: Capteurs de température

l'IEC 62765-2:2019 identifie les exigences minimales et les pratiques applicables pour la correction et la prévention des effets possibles sur la sûreté des centrales nucléaires de puissance (CNP) dus au vieillissement des capteurs de température, tels que les sondes à résistance (SR) et les couples thermoélectriques (TC) de ces centrales.
Le présent document fournit les stratégies, les exigences techniques et les pratiques recommandées pour la gestion du vieillissement des capteurs de température importants pour la sûreté dans les centrales nucléaires de puissance pour s'assurer que le vieillissement peut être identifié et que les actions pour y remédier sont mises en œuvre lorsque cela est nécessaire pour démontrer que la sûreté de l'installation ne sera pas dégradée. Le présent document est aligné avec l'IEC 62342 qui fournit des recommandations sur la gestion du vieillissement des systèmes d'instrumentation et de contrôle-commande (I&C) importants pour la sûreté dans les centrales nucléaires de puissance.

General Information

Status
Published
Publication Date
28-Jan-2019
ICS
01 - GENERALITIES. TERMINOLOGY. STANDARDIZATION. DOCUMENTATION
27.120.20 - Nuclear power plants. Safety
Technical Committee
SC 45A - Instrumentation, control and electrical power systems of nuclear facilities
Drafting Committee
WG 10 - TC 45/SC 45A/WG 10
Current Stage
PPUB - Publication issued
Start Date
19-Oct-2018
Completion Date
29-Jan-2019
Ref Project

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IEC 62765-2:2019 - Nuclear power plants - Instrumentation and control important to safety - Management of ageing of sensors and transmitters - Part 2: Temperature sensorsIEC 62765-2:2019 - Nuclear power plants - Instrumentation and control important to safety - Management of ageing of sensors and transmitters - Part 2: Temperature sensors
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IEC 62765-2:2019 - Nuclear power plants - Instrumentation and control important to safety - Management of ageing of sensors and transmitters - Part 2: Temperature sensors
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IEC 62765-2 ®
Edition 1.0 2019-01
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Nuclear powers plants – Instrumentation and control important to safety –
Management of ageing of sensors and transmitters –
Part 2: Temperature sensors
Centrales nucléaires de puissance – Instrumentation et contrôle-commande
importants pour la sûreté – Gestion du vieillissement des capteurs et des
transmetteurs –
Partie 2: Capteurs de température

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IEC 62765-2 ®
Edition 1.0 2019-01
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Nuclear powers plants – Instrumentation and control important to safety –

Management of ageing of sensors and transmitters –

Part 2: Temperature sensors
Centrales nucléaires de puissance – Instrumentation et contrôle-commande

importants pour la sûreté – Gestion du vieillissement des capteurs et des

transmetteurs –
Partie 2: Capteurs de température

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 27.120.20 ISBN 978-2-8322-6171-2

– 2 – IEC 62765-2:2019 © IEC 2019
CONTENTS
FOREWORD . 4
INTRODUCTION . 6
1 Scope . 8
2 Normative references . 8
3 Terms and definitions . 9
4 Abbreviated terms . 13
5 Technical background . 13
5.1 General . 13
5.2 Type of the sensors in IEC standards . 14
5.2.1 General . 14
5.2.2 RTDs in IEC standards . 14
5.2.3 Thermocouples in IEC standards . 14
5.3 Interface between the sensors and process in IEC standards . 15
5.3.1 Thermowell . 15
5.3.2 Cable connectors for temperature sensors . 15
5.3.3 Cables of temperature sensors . 15
5.3.4 Sheath for temperature sensor cable . 15
5.4 Ageing effects of temperature sensors . 16
5.5 Environmental stressors . 16
5.6 Techniques for detecting temperature sensor ageing . 17
6 Ageing management of temperature sensors . 17
6.1 General . 17
6.2 Methodology of ageing management . 18
6.3 Ageing management program for temperature sensors . 18
6.4 Identification and assessment of ageing by performance verification tests . 19
6.5 Test and inspection interval . 19
6.6 Test location . 19
6.7 Calibration of measurement and test equipment (M&TE) . 19
6.8 Test and inspection results . 20
6.9 Validation of test methods . 20
6.10 Classification of condition monitoring system and its software . 20
6.11 Replacement of sensor or its parts . 20
7 Acceptable means for sensor testing . 20
8 Relationship between initial qualification and sensor ageing management . 21
Annex A (informative) Performance verification of temperature sensors . 22
A.1 Tests – Verification of performance . 22
A.2 Calibration test of temperature sensors . 23
A.2.1 General . 23
A.2.2 Comparison of traditional calibration and online calibration method . 23
A.3 Response time testing . 24
A.4 Uncertainty of elements for the sensors . 24
A.5 Corrective actions for inoperable sensors . 25
A.6 Alternative method with online testing . 26
A.7 Documentation of calibration . 26
Annex B (informative) IAEA and IEC standards related to ageing management of the
sensors . 27

Annex C (informative) Tolerances of temperature sensors in international standards . 28
C.1 General . 28
C.2 ITS-90. 28
C.3 Tolerance classes of temperature sensors . 28
C.4 Calibration tolerance . 29
Annex D (informative) Development of a plant ageing management program of
temperature sensors . 30
D.1 General . 30
D.2 Key steps for AMP of temperature sensors . 30
D.3 Ageing management program . 31
Bibliography . 33

Figure 1 – Schematic diagram of a TC (sourced from IEC 62651) . 14
Figure 2 – Conceptual methodology of ageing management processes . 18

Table 1 – Examples of ageing effects and their potential causes . 16
Table 2 – Examples of environmental stressors with potential consequence . 17
Table A.1 – Consideration for verification of performance test . 22
Table A.2 – Type test, routine test, and additional test for RTD . 23
Table A.3 – Comparison of concerns of calibration methods . 24
Table A.4 – Examples of uncertainty issues for RTDs . 25
Table A.5 – Required example actions followed by acceptance criteria . 25
Table B.1 – IAEA standards related to ageing management . 27
Table B.2 – Ageing ma
...

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