Nuclear power plants - Instrumentation and control important to safety - Electrical equipment condition monitoring methods - Part 6: Insulation resistance

IEC/IEEE 62582-6:2019 contains methods for condition monitoring of organic and polymeric materials in instrumentation and control cables using insulation resistance measurements in the detail necessary to produce accurate and reproducible results during simulated accident conditions. It includes the requirements for the measurement system and measurement procedure, and the reporting of the measurement results.
NOTE Measurement of insulation resistance during simulated accident conditions with the aim of determining the lowest value during the accident in order to assess cable performance involves special requirements given in this document. Methods for measurement under stable (non-accident) conditions are available in other international standards, e.g. IEC 62631-3-3.
The different parts of the IEC/IEEE 62582 series are measurement standards, primarily for use in the management of ageing in initial qualification and after installation. IEC/IEEE 62582-1 includes requirements for the application of the other parts of the IEC/IEEE 62582 series and some elements which are common to all methods. Information on the role of condition monitoring in qualification of equipment important to safety is found in IEC/IEEE 60780-323.

Centrales nucléaires de puissance - Instrumentation et contrôle-commande importants pour la sûreté - Méthodes de surveillance de l'état des matériels électriques - Partie 6: Résistance d'isolement

l'IEC/IEEE 62582-6:2019 contient les méthodes de surveillance de l'état des matériaux organiques et polymères utilisés dans les câbles d'instrumentation et de contrôle‑commande, sur la base de mesures de la résistance d'isolement et de façon suffisamment détaillée pour obtenir des résultats précis et reproductibles en conditions accidentelles simulées. Elle comprend les exigences pour le système de mesure et la procédure de mesure, ainsi que les rapports des résultats de mesure.
NOTE La mesure de la résistance d'isolement en conditions accidentelles simulées dans le but de déterminer la valeur la plus faible durant l'accident pour évaluer les performances des câbles, implique le respect des exigences particulières définies dans le présent document. Les méthodes de mesure en conditions normales (non accidentelles) sont disponibles dans d'autres Normes internationales, par exemple dans l'IEC 62631-3-3.
Les différentes parties de la série IEC/IEEE 62582 sont des normes de mesure, principalement destinées à être utilisées pour la gestion du vieillissement dans le cadre de la qualification initiale et après installation. L'IEC/IEEE 62582-1 fournit les exigences applicables à toutes les autres parties de la série IEC/IEEE 62582 et certains éléments communs à l'ensemble des méthodes. L'IEC/IEEE 60780-323 fournit des informations concernant le rôle de la surveillance de l'état dans la qualification des matériels importants pour la sûreté.

General Information

Status
Published
Publication Date
21-Oct-2019
Current Stage
PPUB - Publication issued
Completion Date
22-Oct-2019
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IEC/IEEE 62582-6
Edition 1.0 2019-10
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Nuclear power plants ‒ Instrumentation and control important to safety ‒
Electrical equipment condition monitoring methods –
Part 6: Insulation resistance
Centrales nucléaires de puissance – Instrumentation et contrôle-commande
importants pour la sûreté – Méthodes de surveillance de l'état des matériels
électriques –
Partie 6: Résistance d'isolement
IEC/IEEE 62582-6:2019-10(en-fr)
---------------------- Page: 1 ----------------------
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---------------------- Page: 2 ----------------------
IEC/IEEE 62582-6
Edition 1.0 2019-10
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Nuclear power plants ‒ Instrumentation and control important to safety ‒
Electrical equipment condition monitoring methods –
Part 6: Insulation resistance
Centrales nucléaires de puissance – Instrumentation et contrôle-commande
importants pour la sûreté – Méthodes de surveillance de l'état des matériels
électriques –
Partie 6: Résistance d'isolement
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 27.120.20 ISBN 978-2-8322-7050-9

Warning! Make sure that you obtained this publication from an authorized distributor.

Attention! Veuillez vous assurer que vous avez obtenu cette publication via un distributeur agréé.

® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale
---------------------- Page: 3 ----------------------
– 2 – IEC/IEEE 62582-6:2019 © IEC/IEEE 2019
CONTENTS

FOREWORD ........................................................................................................................... 4

INTRODUCTION ..................................................................................................................... 6

1 Scope .............................................................................................................................. 8

2 Normative references ...................................................................................................... 8

3 Terms and definitions ...................................................................................................... 8

4 Abbreviated terms and acronyms ..................................................................................... 9

5 General description ....................................................................................................... 10

6 Applicability and reproducibility ..................................................................................... 12

7 Instrumentation .............................................................................................................. 12

7.1 Measurement voltage level ................................................................................... 12

7.2 Uncertainty ........................................................................................................... 12

7.3 Calibration ............................................................................................................ 13

8 IR measurement procedure ........................................................................................... 13

8.1 General ................................................................................................................. 13

8.2 Requirements on tracking of changes of IR during the simulated accident

conditions ............................................................................................................. 13

8.3 Test specimen ...................................................................................................... 13

8.4 Interference .......................................................................................................... 13

8.5 Conditioning .......................................................................................................... 13

8.6 IR measurement during the dynamic phase of the simulated accident

conditions ............................................................................................................. 14

8.6.1 Set-up for the measurement .......................................................................... 14

8.6.2 Connection of IR voltage and start of measurement ....................................... 14

8.6.3 Default voltage .............................................................................................. 14

8.6.4 Determination of IR value with the specimen not energized during the

accident simulation ........................................................................................ 14

8.6.5 Determination of the IR value with the specimen energized during the

accident simulation ........................................................................................ 15

9 Measurement report ...................................................................................................... 16

Annex A (informative) Example of equivalent diagram for a cable and the measuring

device using DC .................................................................................................................... 17

Annex B (informative) Measurement of leakage current using AC voltage ............................ 18

Annex C (informative) Dependence of IR on temperature only and combined with

steam ................................................................................................................................... 19

Annex D (informative) Examples of results of measurement of IR on aged cables

during simulated accident conditions..................................................................................... 20

Annex E (informative) Example of a measurement loop and calculation of the time
available for stabilization for more than one conductor or group of conductors

measured with the same measurement instrument ................................................................ 23

E.1 Example of one measurement loop ....................................................................... 23

E.2 Total time for each measurement of all combinations during the dynamic

phase of the simulated accident conditions ........................................................... 23

Bibliography .......................................................................................................................... 24

Figure 1 – Time to stabilization of IR measured before LOCA, after 10 min in LOCA

and after 60 min in LOCA ...................................................................................................... 11

---------------------- Page: 4 ----------------------
IEC/IEEE 62582-6:2019 © IEC/IEEE 2019 – 3 –

Figure A.1 – Set-up for measurement of IR using a DC voltage source (guard is not

needed if the ground plane is close to the insulator) ............................................................. 17

Figure B.1 – Set-up for measurement of IR using an AC voltage source ............................... 18

Figure C.1 – Temperature influence on IR of an insulation between 20 °C and 150 °C .......... 19

Figure D.1 – Example of result of measurement of IR between conductors and

ground/shielding during a LOCA test ..................................................................................... 20

Figure D.2 – Example of measurement of IR between conductor and ground and

between conductors .............................................................................................................. 21

Figure D.3 – Example of measurement of IR on a three-conductor cable during LOCA

simulation ............................................................................................................................. 22

Figure E.1 – Example of one measurement loop ................................................................... 23

---------------------- Page: 5 ----------------------
– 4 – IEC/IEEE 62582-6:2019 © IEC/IEEE 2019
NUCLEAR POWER PLANTS ‒
INSTRUMENTATION AND CONTROL IMPORTANT TO SAFETY ‒
ELECTRICAL EQUIPMENT CONDITION MONITORING METHODS –
Part 6: Insulation resistance
FOREWORD

1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising

all national electrotechnical committees (IEC National Committees). The object of IEC is to promote

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---------------------- Page: 6 ----------------------
IEC/IEEE 62582-6:2019 © IEC/IEEE 2019 – 5 –
International Standard IEC/IEEE 62582-6 has been prepared by subcommittee 45A:

Instrumentation, control and electrical power systems of nuclear facilities, of IEC technical

committee 45: Nuclear instrumentation, in cooperation with the Nuclear Power Engineering

Committee of the Power & Energy Society of the IEEE] , under the IEC/IEEE Dual Logo

Agreement.
It is published as an IEC/IEEE dual logo standard.
The text of this International Standard is based on the following documents:
FDIS Report on voting
45A/1267/FDIS 45A/1277/RVD

Full information on the voting for the approval of this International Standard can be found in

the report on voting indicated in the above table.

A list of all parts in the IEC/IEEE 62582 series, published under the general title Nuclear

power plants – Instrumentation and control important to safety – Electrical equipment

condition monitoring methods, can be found on the IEC website.

International standards are drafted in accordance with the rules given in the ISO/IEC

Directives, Part 2.

The IEC Technical Committee and IEEE Technical Committee have decided that the contents

of this publication will remain unchanged until the stability date indicated on the IEC web site

under "http://webstore.iec.ch" in the data related to the specific publication. At this date, the

publication will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.

IMPORTANT – The 'colour inside' logo on the cover page of this publication indicates

that it contains colours which are considered to be useful for the correct

understanding of its contents. Users should therefore print this document using a

colour printer.
_____________
A list of IEEE participants can be found at the following URL: https://ieee-
sa.imeetcentral.com/p/eAAAAAAAQbmGAAAAACt2TZA
---------------------- Page: 7 ----------------------
– 6 – IEC/IEEE 62582-6:2019 © IEC/IEEE 2019
INTRODUCTION
a) Technical background, main issues and organisation of the Standard

This IEC/IEEE standard specifically focuses on insulation resistance measurement methods

for monitoring of the dielectric condition of instrumentation and control cables during

simulation of design basis events.

This IEC/IEEE standard is the sixth part of the IEC/IEEE 62582-series. It contains detailed

descriptions of condition monitoring based on insulation resistance measurements.

The IEC/IEEE 62582-series of standards is issued with a joint logo which makes it applicable

to management of ageing of electrical equipment qualified to IEEE as well as IEC Standards.

For aged cables and accessories, the dielectric behaviour during simulated accident

conditions generally indicates the condition of the cable during the simulated accident

condition.

Significant research has been performed on condition monitoring techniques and the use of

these techniques in equipment qualification as noted in NUREG/CR-6704, vol.2
(BNL-NUREG-52610) and JNES-SS-0903, 2009.

It is intended that this Standard be used by test laboratories, operators of nuclear power

plants, systems evaluators and licensors.

b) Situation of the current Standard in the structure of the IEC SC 45A standard series

IEC/IEEE 62582-6 is the third level IEC SC 45A document tackling the specific issue of

application and performance of insulation resistance measurements during simulated accident

conditions in nuclear power plants.

IEC/IEEE 62582-6 is to be read in association with IEC/IEEE 62582-1. IEC/IEEE 62582-1

provides requirements for application of methods for condition monitoring of electrical

equipment important to safety of nuclear power plants.

For more details on the structure of the IEC SC 45A standard series, see item d) of this

introduction.
c) Recommendations and limitations regarding the application of the Standard

It is important to note that this Standard establishes no additional functional requirements for

safety systems.

d) Description of the structure of the IEC SC 45A standard series and relationships

with other IEC documents and other bodies documents (IAEA, ISO)

The top-level documents of the IEC SC 45A standard series are IEC 61513 and IEC 63046.

IEC 61513 provides general requirements for I&C systems and equipment that are used to

perform functions important to safety in NPPs. IEC 63046 provides general requirements for

electrical power systems of NPPs; it covers power supply systems including the supply

systems of the I&C systems. IEC 61513 and IEC 63046 are to be considered in conjunction

and at the same level. IEC 61513 and IEC 63046 structure the IEC SC 45A standard series

and shape a complete framework establishing general requirements for instrumentation,

control and electrical systems for nuclear power plants.

IEC 61513 and IEC 63046 refer directly to other IEC SC 45A standards for general topics

related to categorization of functions and classification of systems, qualification, separation,

---------------------- Page: 8 ----------------------
IEC/IEEE 62582-6:2019 © IEC/IEEE 2019 – 7 –

defence against common cause failure, control room design, electromagnetic compatibility,

cybersecurity, software and hardware aspects for programmable digital systems, coordination

of safety and security requirements and management of ageing. The standards referenced

directly at this second level should be considered together with IEC 61513 and IEC 63046 as

a consistent document set.

At a third level, IEC SC 45A standards not directly referenced by IEC 61513 or by IEC 63046

are standards related to specific equipment, technical methods, or specific activities. Usually

these documents, which make reference to second-level documents for general topics, can be

used on their own.

A fourth level extending the IEC SC 45 standard series, corresponds to the Technical Reports

which are not normative.

The IEC SC 45A standards series consistently implements and details the safety and security

principles and basic aspects provided in the relevant IAEA safety standards and in the

relevant documents of the IAEA nuclear security series (NSS). In particular this includes the

IAEA requirements SSR-2/1, establishing safety requirements related to the design of nuclear

power plants (NPPs), the IAEA safety guide SSG-30 dealing with the safety classification of

structures, systems and components in NPPs, the IAEA safety guide SSG-39 dealing with the

design of instrumentation and control systems for NPPs, the IAEA safety guide SSG-34

dealing with the design of electrical power systems for NPPs and the implementing guide

NSS17 for computer security at nuclear facilities. The safety and security terminology and

definitions used by SC 45A standards are consistent with those used by the IAEA.

IEC 61513 and IEC 63046 have adopted a presentation format similar to the basic safety

publication IEC 61508 with an overall life-cycle framework and a system life-cycle framework.

Regarding nuclear safety, IEC 61513 and IEC 63046 provide the interpretation of the general

requirements of IEC 61508-1, IEC 61508-2 and IEC 61508-4, for the nuclear application

sector. In this framework IEC 60880, IEC 62138 and IEC 62566 correspond to IEC 61508-3

for the nuclear application sector. IEC 61513 and IEC 63046 refer to ISO as well as to IAEA

GS-R part 2 and IAEA GS-G-3.1 and IAEA GS-G-3.5 for topics related to quality assurance

(QA). At level 2, regarding nuclear security, IEC 62645 is the entry document for the

IEC/SC 45A security standards. It builds upon the valid high level principles and main

concepts of the generic security standards, in particular ISO/IEC 27001 and ISO/IEC 27002; it

adapts them and completes them to fit the nuclear context and coordinates with the

IEC 62443 series. At level 2, IEC 60964 is the entry document for the IEC/SC 45A control

rooms standards and IEC 62342 is the entry document for the ageing management standards.

NOTE 1 It is assumed that for the design of I&C systems in NPPs that implement conventional safety functions

(e.g. to address worker safety, asset protection, chemical hazards, process energy hazards) international or

national standards would be applied.

NOTE 2 IEC/SC 45A domain was extended in 2013 to cover electrical systems. In 2014 and 2015 discussions

were held in IEC/SC 45A to decide how and where general requirements for the design of electrical systems were

to be considered. IEC/SC 45A experts recommended that an independent standard be developed at the same level

as IEC 61513 to establish general requirements for electrical systems. Project IEC 63046 is now launched to cover

this objective. When IEC 63046 is published, this NOTE 2 of the introduction of IEC/SC 45A standards will be

suppressed.
---------------------- Page: 9 ----------------------
– 8 – IEC/IEEE 62582-6:2019 © IEC/IEEE 2019
NUCLEAR POWER PLANTS ‒
INSTRUMENTATION AND CONTROL IMPORTANT TO SAFETY ‒
ELECTRICAL EQUIPMENT CONDITION MONITORING METHODS –
Part 6: Insulation resistance
1 Scope

This part of IEC/IEEE 62582 contains methods for condition monitoring of organic and

polymeric materials in instrumentation and control cables using insulation resistance

measurements in the detail necessary to produce accurate and reproducible results during

simulated accident conditions. It includes the requirements for the measurement system and

measurement procedure, and the reporting of the measurement results.

NOTE Measurement of insulation resistance during simulated accident conditions with the aim of determining the

lowest value during the accident in order to assess cable performance involves special requirements given in this

document. Methods for measurement under stable (non-accident) conditions are available in other international

standards, e.g. IEC 62631-3-3.

The different parts of the IEC/IEEE 62582 series are measurement standards, primarily for

use in the management of ageing in initial qualification and after installation. IEC/IEEE 62582-

1 includes requirements for the application of the other parts of the IEC/IEEE 62582 series

and some elements which are common to all methods. Information on the role of condition

monitoring in qualification of equipment important to safety is found in IEC/IEEE 60780-323.

2 Normative references

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.

JCGM 100:2008, Evaluation of measurement data – Guide to the expression of uncertainty in

measurement. First edition 2008. Corrected version 2010
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.

For definitions not specifically called out in this standard, the following references could be

useful:
• IEC Electropedia: available at http://www.electropedia.org/
• ISO Online browsing platform: available at http://www.iso.org/obp
• IEEE Standards Online Dictionary: available at http://dictionary.ieee.org
3.1
capacitive charging current

current that charges the capacitor formed by the tested insulation between the conducting

parts connected to the measuring instrument inputs

Note 1 to entry: At the beginning the capacitor is not charged and high current is flowing. The current drops as

the capacitor is being charged.
---------------------- Page: 10 ----------------------
IEC/IEEE 62582-6:2019 © IEC/IEEE 2019 – 9 –
3.2
conductor
material that allows the flow of an electric current

Note 1 to entry: The term conductor used in this document is synonymous with the term wire.

3.3
insulation leakage current
current that flows through insulation
3.4
insulation resistance
resistance between two conducting parts separated by electric insulation

Note 1 to entry: The value of the measured insulation resistance shall be reported as Ωm.

3.5
polarization absorption current

component of a dielectric current that is proportional to the rate of accumulation of electric

charges within the dielectric
3.6
surface leakage current

current that flows on the surface of insulation between connection points of applied voltage

Note 1 to entry: The surface leakage current is constant with time.
4 Abbreviated terms and acronyms
AC Alternating current
DAQ Data acquisition
DC Direct current
DMM Digital multimeter
GUM Guide to the expression of uncertainty in measurement
JCGM Joint committee for guides in metrology
IR Insulation resistance
l Surface leakage current
l Insulation leakage current
l Polarization absorption current
l Capacitive charging current
LOCA Loss of coolant accident
R Resistance of the resistor intended for measuring the total leakage current
meas
U Voltage across the resistor R
meas meas
U Supply voltage
source
---------------------- Page: 11 ----------------------
– 10 – IEC/IEEE 62582-6:2019 © IEC/IEEE 2019
5 General description

Insulation resistance measurement is one commonly applied method for indication of the

condition of insulating components, primarily cable insulation
...

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