SIST EN 62765-1:2018

Nuclear powers plants - Instrumentation and control important to safety - Management of ageing of sensors and transmitters - Part 1: Pressure transmitters (IEC 62765-1:2015)

This part of IEC 62765 provides strategies, technical requirements, and recommended practices for the management of ageing to ensure that ageing of pressure transmitters important to safety in nuclear power plants (NPPs) 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 standard is aligned with the IEC 62342 standards, which provides guidance on ageing management for I&C systems important to safety in NPPs. This standard, IEC 62765-1, is the first part for pressure transmitters in the IEC 62765 sensor and transmitter series for pressure, temperature, neutron and other sensors. This standard deals with analogue electronic pressure transmitters, which have an electrical signal output that is a function of pressure applied on the sensing part, and which are included in I&C systems important to safety in accordance with IAEA terminology.
Any software used for data acquisition, data qualification, or data analysis for transmitter testing or condition monitoring system for pressure transmitter is classified according to IEC 62138 depending on its functionality as specified in IEC 61226. The qualification of the software for the digital data processing is beyond the scope of this standard.
Additional condition monitoring system for ageing management of the pressure transmitters is classified according to IEC 61226 with respect to its functionality. If classified, the software installed in the monitoring system complies with IEC 62138 for its B or C categorised function.
Regarding environmental qualification, the requirements of IEC 60780 apply. For assessing the performance of transmitters in the safety system instrument channel, the IEC 62385 methods, IEC 61888 requirements and IEC 60671 surveillance testing requirements apply.
Pressure measurements may be used for the measurement of other parameters that can be related to pressure, e.g., level or flow. Interfaces which include sensing lines, condensing pots, and primary (e.g., flow) elements between process and transmitters are within the scope
of this standard.

Kernkraftwerke - Leittechnik mit sicherheitstechnischer Bedeutung - Alterungsmanagement von Sensoren und Transmittern - Teil 1: Drucktransmitter (IEC 62765-1:2015)

Centrales nucléaires de puissance - Instrumentation et contrôle-commande importants pour la sûreté - Gestion du vieillissement des capteurs et des transmetteurs - Partie 1: Transmetteurs de pression (IEC 62765-1:2015)

L'IEC 62765:2015 fournit des stratégies, des exigences techniques, et la description de pratiques recommandées pour la gestion du vieillissement pour assurer que le vieillissement des transmetteurs de pression importants pour la sûreté des centrales nucléaires de puissance peut être identifié et que les actions pour y remédier sont lancées comme nécessaire pour démontrer que la sûreté de l'installation ne sera pas dégradée. La présente norme est cohérente avec l'IEC 62342 qui fournit des recommandations sur la gestion du vieillissement des systèmes d'I&C des centrales nucléaires de puissance importants pour la sûreté. La présente norme IEC 62765-1 dédiée aux transmetteurs de pression, est la première partie de la série IEC 62765 qui couvrira les capteurs et transmetteurs de pression, de température, les capteurs neutroniques et autres.

Jedrske elektrarne - Instrumenti in krmilje, pomembni za varnost - Upravljanje staranja senzorjev in oddajnikov - 1. del: Dajalniki tlaka (IEC 62765-1:2015)

Ta del standarda IEC 62765 določa strategije, tehnične zahteve in priporočene prakse za upravljanje staranja, da se zagotovi prepoznavanje staranja dajalnikov tlaka, ki so pomembni za varnost v jedrskih elektrarnah (NPP), in da se izvedejo ustrezni ukrepi za odpravo pomanjkljivosti kot prikaz, da varnost elektrarne ni ogrožena. Ta standard je skladen s standardi IEC 62342, ki opredeljujejo smernice glede upravljanja staranja sistemov I&C, ki so pomembni za varnost jedrskih elektrarn. Standard IEC 62765-1 je prvi del o dajalnikih tlaka iz skupine standardov IEC 62765 o senzorjih in oddajnikih za tlačne, temperaturne, nevtronske in druge senzorje. Ta standard obravnava analogne elektronske dajalnike tlaka z električnim izhodnim signalom, ki je funkcija delovanja tlaka na del za zaznavanje, ki so zajeti v sistemih I&C, pomembnih za varnost v skladu s terminologijo IAEA.
Vsaka programska oprema, ki se uporablja za pridobivanje podatkov, kvalifikacijo podatkov ali analizo podatkov za preskušanje oddajnika ali sistem za nadzor stanja za dajalnik tlaka, se razvrsti v skladu s standardom IEC 62138, odvisno od njene funkcionalnosti, kot je določeno v standardu IEC 61226. Ustreznost programske opreme za digitalno obdelavo podatkov je izven področja uporabe tega standarda.
Dodatni sistem za nadzor stanja za upravljanje staranja dajalnikov tlaka se razvrsti v skladu s standardom IEC 61226 glede na funkcionalnost sistema. V primeru razvrstitve je programska oprema, ki je nameščena v sistem za nadzor, v skladu s standardom IEC 62138 za funkciji, razvrščeni kot B ali C.
Za okoljsko kvalifikacijo veljajo zahteve standarda IEC 60780. Za oceno zmogljivosti oddajnikov v kanalu instrumenta varnostnega sistema se uporabljajo metode standarda IEC 62385, zahteve standarda IEC 61888 in zahteve za nadzorno preskušanje standarda IEC 60671.
Meritve tlaka se lahko uporabijo za merjenje drugih parametrov, ki so lahko povezani s tlakom, npr. raven ali pretok. Vmesniki, ki vključujejo vode za zaznavanje, kondenzatorje in primarne (npr. pretočne) elemente med procesom in oddajniki, spadajo na področje uporabe
tega standarda.

General Information

• Status: Published
• Publication Date: 07-Nov-2017
• ICS: 27.120.20 - Nuclear power plants. Safety
• Technical Committee: I09 - Imaginarni 09
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 19-Oct-2017
• Due Date: 24-Dec-2017
• Completion Date: 08-Nov-2017
• Ref Project: EN 62765-1:2017 - Nuclear powers plants - Instrumentation and control important to safety - Management of ageing of sensors and transmitters - Part 1: Pressure transmitters

Standards Content (Sample)

SLOVENSKI STANDARD
SIST EN 62765-1:2018
01-januar-2018
Jedrske elektrarne - Instrumenti in krmilje, pomembni za varnost - Upravljanje
staranja senzorjev in oddajnikov - 1. del: Dajalniki tlaka (IEC 62765-1:2015)
Nuclear powers plants - Instrumentation and control important to safety - Management of
ageing of sensors and transmitters - Part 1: Pressure transmitters (IEC 62765-1:2015)
Kernkraftwerke - Leittechnik mit sicherheitstechnischer Bedeutung -
Alterungsmanagement von Sensoren und Transmittern - Teil 1: Drucktransmitter (IEC
62765-1:2015)
Centrales nucléaires de puissance - Instrumentation et contrôle-commande importants
pour la sûreté - Gestion du vieillissement des capteurs et des transmetteurs - Partie 1:
Transmetteurs de pression (IEC 62765-1:2015)
Ta slovenski standard je istoveten z: EN 62765-1:2017
ICS:
27.120.20 Jedrske elektrarne. Varnost Nuclear power plants. Safety
SIST EN 62765-1:2018 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN 62765-1:2018

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SIST EN 62765-1:2018


EUROPEAN STANDARD EN 62765-1

NORME EUROPÉENNE

EUROPÄISCHE NORM
October 2017
ICS 27.120.20

English Version
Nuclear powers plants - Instrumentation and control important
to safety - Management of ageing of sensors and transmitters -
Part 1: Pressure transmitters
(IEC 62765-1:2015)
Centrales nucléaires de puissance - Instrumentation et Kernkraftwerke - Leittechnik mit sicherheitstechnischer
contrôle-commande importants pour la sûreté - Gestion du Bedeutung - Alterungsmanagement von Sensoren und
vieillissement des capteurs et des transmetteurs - Partie 1: Transmittern - Teil 1: Drucktransmitter
Transmetteurs de pression (IEC 62765-1:2015)
(IEC 62765-1:2015)
This European Standard was approved by CENELEC on 2017-09-11. 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.
Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC
Management Centre or to any CENELEC member.
This European Standard exists 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, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden,
Switzerland, Turkey and the United Kingdom.


European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels
© 2017 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
 Ref. No. EN 62765-1:2017 E

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SIST EN 62765-1:2018
EN 62765-1:2017
European foreword
This document (EN 62765-1:2017) consists of the text of IEC 62765-1:2015 prepared by
SC 45A "Instrumentation, control and electrical systems of nuclear facilities" of IEC/TC 45 "Nuclear
instrumentation".

The following dates are fixed:

• latest date by which this document has to be (dop) 2018-09-11
implemented at national level by publication of an
identical national standard or by endorsement
• latest date by which the national standards (dow) 2020-09-11
conflicting with this document have to be
withdrawn

Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CENELEC shall not be held responsible for identifying any or all such patent rights.

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 European standard does
not prevent Member States from taking more stringent nuclear safety and/or security measures in the
subject-matter covered by this standard.
Endorsement notice
The text of the International Standard IEC 62765-1:2015 was approved by CENELEC as a European
Standard without any modification.

In the official version, for Bibliography, the following notes have to be added for the standards indicated:

IEC 61508-1 NOTE Harmonized as EN 61508-1.
IEC 61508-2 NOTE Harmonized as EN 61508-2.
IEC 61508-3 NOTE Harmonized as EN 61508-3.
IEC 61508-4 NOTE Harmonized as EN 61508-4.
IEC 61513 NOTE Harmonized as EN 61513.
2

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SIST EN 62765-1:2018
EN 62765-1:2017
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.cenelec.eu.

Publication Year Title EN/HD Year

IEC 60671 -  Nuclear power plants - Instrumentation EN 60671 -
and control systems important to safety -
Surveillance testing
IEC 60780 -  Nuclear power plants - Electrical - -
equipment of the safety system -
Qualification
IEC 61226 -  Nuclear power plants - Instrumentation EN 61226 -
and control important to safety -
Classification of instrumentation and
control functions
IEC 62138 -  Nuclear power plants - Instrumentation EN 62138 -
and control important for safety - Software
aspects for computer-based systems
performing category B or C functions
IEC 62342 -  Nuclear power plants - Instrumentation - -
and control systems important to safety -
Management of ageing
IEC 62385 2007 Nuclear power plants - Instrumentation and - -
control important to safety - Methods for
assessing the performance of safety
system instrument channels
IEC 62465 2010 Nuclear power plants - Instrumentation and - -
control important to safety - Management
of ageing of electrical cabling systems

3

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SIST EN 62765-1:2018

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SIST EN 62765-1:2018




IEC 62765-1

®


Edition 1.0 2015-04




INTERNATIONAL



STANDARD




NORME



INTERNATIONALE
colour

inside










Nuclear powers plants – Instrumentation and control important to safety –

Management of ageing of sensors and transmitters –

Part 1: Pressure transmitters




Centrales nucléaires de puissance – Instrumentation et contrôle-commande

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


transmetteurs –

Partie 1: Transmetteurs de pression












INTERNATIONAL

ELECTROTECHNICAL

COMMISSION


COMMISSION

ELECTROTECHNIQUE


INTERNATIONALE




ICS 27.120.20 ISBN 978-2-8322-2629-2



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

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SIST EN 62765-1:2018
– 2 – IEC 62765-1:2015 © IEC 2015
CONTENTS
FOREWORD . 4
INTRODUCTION . 6
1 Scope . 8
2 Normative references . 8
3 Terms and definitions . 9
4 Abbreviations . 12
5 Background . 12
5.1 General . 12
5.2 Type of transmitter and interface. 12
5.2.1 Type of transmitters . 12
5.2.2 Interface between sensing part and process . 13
5.3 Reasons for transmitter ageing management . 13
5.4 Environmental stressors . 14
5.4.1 General . 14
5.4.2 Radiation . 14
5.4.3 Temperature . 15
5.4.4 Humidity . 15
5.4.5 Pressure transients . 15
5.4.6 Vibration . 15
5.4.7 Corrosive chemical reaction . 15
5.5 Sensing line problems to be considered with transmitter ageing . 16
5.6 Techniques for detecting pressure transmitter ageing . 16
6 Ageing management of transmitters . 17
6.1 General . 17
6.2 Methodology of ageing management . 17
6.3 Identification of ageing by performance verification test . 18
6.4 Test and inspection interval . 18
6.5 Test location . 19
6.6 Calibration of measurement and test equipment . 19
6.7 Test and inspection results . 19
6.8 Validation of test methods . 19
6.9 Classification of condition monitoring system and its software . 19
6.10 Replacement of transmitter or its parts . 19
7 Acceptable means for transmitter testing . 20
8 Relationship between initial qualification and transmitter ageing management . 20
Annex A (informative)  Calibration for type tests or periodic tests . 21
A.1 General . 21
A.2 Configuration for calibration of transmitters . 21
A.3 Uncertainty and TDF between M&TE and EUT . 21
A.4 Criteria for calibration tolerance . 22
A.4.1 As-found value and as-left value . 22
A.4.2 Allowable conditions for adjustment in calibration . 22
A.5 Calibration with adjustment . 22
Annex B (informative) Performance verification tests . 23
B.1 Test – Verification of performance . 23

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SIST EN 62765-1:2018
IEC 62765-1:2015 © IEC 2015 – 3 –
B.2 Acceptable limits for test . 23
B.2.1 Linearity and accuracy . 23
B.2.2 Response time . 24
B.3 Alternative method with on-line calibration . 24
B.4 Remedial actions for inoperable transmitters . 25
B.5 Written procedure for calibration . 25
Bibliography . 27

Figure 1 – Conceptual methodology of ageing management . 18
Figure A.1 – Process and transmitter configuration for calibration . 21

Table 1 – Examples of ageing effects that can cause performance degradation in PTs . 14
Table 2 – Examples of environmental stressors with potential to damage transmitters . 16
Table B.1 – Consideration for verification of performance (see IEC 62385:2007,
Clauses 5 and 6) . 23
Table B.2 – Uncertainty of elements for Pressure transmitters (see IEC 61888:2002,
5.3.1) . 24
Table B.3 – Comparison between traditional and on-line tests of response time . 24
Table B.4 – Required actions followed by as-found value during calibration test as an
example . 25

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SIST EN 62765-1:2018
– 4 – IEC 62765-1:2015 © IEC 2015
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________

NUCLEAR POWERS PLANTS –
INSTRUMENTATION AND CONTROL
IMPORTANT TO SAFETY – MANAGEMENT
OF AGEING OF SENSORS AND TRANSMITTERS –

Part 1: Pressure transmitters

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
international co-operation on all questions concerning standardization in the electrical and electronic fields. To
this end and in addition to other activities, IEC publishes International Standards, Technical Specifications,
Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC
Publication(s)”). Their preparation is entrusted to technical committees; any IEC National Committee interested
in the subject dealt with may participate in this preparatory work. International, governmental and non-
governmental organizations liaising with the IEC also participate in this preparation. IEC collaborates closely
with the International Organization for Standardization (ISO) in accordance with conditions determined by
agreement between the two organizations.
2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
consensus of opinion on the relevant subjects since each technical committee has representation from all
interested IEC National Committees.
3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC
Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any
misinterpretation by any end user.
4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
transparently to the maximum extent possible in their national and regional publications. Any divergence
between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in
the latter.
5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity
assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any
services carried out by independent certification bodies.
6) All users should ensure that they have the latest edition of this publication.
7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and
members of its technical committees and IEC National Committees for any personal injury, property damage or
other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and
expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC
Publications.
8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
indispensable for the correct application of this publication.
9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of
patent rights. IEC shall not be held responsible for identifying any or all such patent rights.
International Standard IEC 62765-1 has been prepared by subcommittee 45A:
Instrumentation, control and electrical systems of nuclear facilities, of IEC technical
committee 45: Nuclear instrumentation.
The text of this standard is based on the following documents:
FDIS Report on voting
45A/1001/FDIS 45A/1015/RVD

Full information on the voting for the approval of this standard can be found in the report on
voting indicated in the above table.

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SIST EN 62765-1:2018
IEC 62765-1:2015 © IEC 2015 – 5 –
This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.
The committee has decided that the contents of this publication will remain unchanged until
the stability date indicated on the IEC website 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.

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SIST EN 62765-1:2018
– 6 – IEC 62765-1:2015 © IEC 2015
INTRODUCTION
a) Technical background, main issues and organisation of the standard
With the majority of NPPs over 20 years old, the management of ageing of transmitters
(pressure, level, flow) is currently a relevant topic, especially for those plants that have
extended their operating licenses or are considering this option. This standard is intended
to be used by operators of NPPs (utilities), systems evaluators, and by licensors.
b) Situation of the current standard in the structure of the IEC SC 45A standard series
IEC 62765 is the third level IEC SC 45A document comprising several parts to tackle the
specific issue of management of ageing of sensors and transmitters in nuclear power
plants (NPPs) for I&C systems important to safety. Part 1 of IEC 62675 is dedicated to
pressure transmitters.
IEC 62342 is the second level standard of SC 45A covering the domain of the
management of ageing of nuclear instrumentation systems used in NPPs to perform
functions important to safety. IEC 62342 is the introduction to a series of standards to be
developed by IEC SC 45A covering the management of ageing of specific I&C systems or
components such as electrical cabling systems (IEC 62465), and sensors and transmitters
(IEC 62765).
IEC 62765 is to be read in association with IEC 62342 and IEC/TR 62096, which is the
appropriate IEC SC 45A Technical Report that provides guidance on the decision for
modernisation when management of ageing techniques are no longer successful.
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 this standard
It is important to note that this standard establishes no additional functional requirements
for safety systems. Ageing mechanisms have to be prevented and thus detected by
performance measurements. Aspects for which special recommendations and limitations
are provided in this standard are:
– criteria for evaluation of ageing of pressure transmitters in NPPs;
– steps to be followed to establish pressure transmitter testing requirements for an
ageing management program for NPP instrumentation systems; and
– relationship between on-going qualification analysis and ageing management program
with regards to pressure transmitters.
It is recognised that testing and monitoring techniques used to evaluate the ageing
condition of NPPs transmitters are continuing to develop at a rapid pace and that it is not
possible for a standard such as this to include references to all modern technologies and
techniques.
This standard identifies minimum requirements aimed at ensuring that any potential
impacts on NPP safety due to ageing of pressure transmitters of NPP can be identified
and that suitable actions are undertaken to demonstrate that the safety of the plant will not
be impaired.
To ensure that this standard will continue to be relevant in future years, the emphasis has
been placed on issues of principle, rather than specific technologies.
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 document of the IEC SC 45A standard series is IEC 61513. It provides
general requirements for I&C systems and equipment that are used to perform functions
important to safety in NPPs. IEC 61513 structures the IEC SC 45A standard series.
IEC 61513 refers directly to other IEC SC 45A standards for general topics related to
categorization of functions and classification of systems, qualification, separation of
systems, defence against common cause failure, software aspects of computer-based
systems, hardware aspects of computer-based systems, and control room design. The
standards referenced directly at this second level should be considered together with
IEC 61513 as a consistent document set.

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SIST EN 62765-1:2018
IEC 62765-1:2015 © IEC 2015 – 7 –
At a third level, IEC SC 45A standards not directly referenced by IEC 61513 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 45A standard series, corresponds to the Technical
Reports which are not normative.
IEC 61513 has adopted a presentation format similar to the basic safety publication
IEC 61508 with an overall safety life-cycle framework and a system life-cycle framework.
Regarding nuclear safety, it provides 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 and IEC 62138 correspond to IEC 61508-3 for the nuclear
application sector. IEC 61513 refers to ISO as well as to IAEA GS-R-3 and IAEA GS-G-3.1
and IAEA GS-G-3.5 for topics related to quality assurance (QA).
The IEC SC 45A standards series consistently implements and details the principles and
basic safety aspects provided in the IAEA code on the safety of NPPs and in the IAEA
safety series, in particular the Requirements SSR-2/1, establishing safety requirements
related to the design of Nuclear Power Plants, and the Safety Guide NS-G-1.3 dealing with
instrumentation and control systems important to safety in Nuclear Power Plants. The
terminology and definitions used by IEC SC 45A standards are consistent with those used
by the IAEA.
NOTE 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, that are based on the requirements of a standard such as IEC 61508.

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SIST EN 62765-1:2018
– 8 – IEC 62765-1:2015 © IEC 2015
NUCLEAR POWERS PLANTS –
INSTRUMENTATION AND CONTROL
IMPORTANT TO SAFETY – MANAGEMENT
OF AGEING OF SENSORS AND TRANSMITTERS –

Part 1: Pressure transmitters



1 Scope
This part of IEC 62765 provides strategies, technical requirements, and recommended
practices for the management of ageing to ensure that ageing of pressure transmitters
important to safety in nuclear power plants (NPPs) 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 standard is aligned with the IEC 62342 standards, which provides
guidance on ageing management for I&C systems important to safety in NPPs. This standard,
IEC 62765-1, is the first part for pressure transmitters in the IEC 62765 sensor and transmitter
series for pressure, temperature, neutron and other sensors.
This standard deals with analogue electronic pressure transmitters, which have an electrical
signal output that is a function of pressure applied on the sensing part, and which are
included in I&C systems important to safety in accordance with IAEA terminology.
Any software used for data acquisition, data qualification, or data analysis for transmitter
testing or condition monitoring system for pressure transmitter is classified according to
IEC 62138 depending on its functionality as specified in IEC 61226. The qualification of the
software for the digital data processing is beyond the scope of this standard.
Additional condition monitoring system for ageing management of the pressure transmitters is
classified according to IEC 61226 with respect to its functionality. If classified, the software
installed in the monitoring system complies with IEC 62138 for its B or C categorised function.
Regarding environmental qualification, the requirements of IEC 60780 apply. For assessing
the performance of transmitters in the safety system instrument channel, the IEC 62385
methods, IEC 61888 requirements and IEC 60671 surveillance testing requirements apply.
Pressure measurements may be used for the measurement of other parameters that can be
related to pressure, e.g., level or flow. Interfaces which include sensing lines, condensing
pots, and primary (e.g., flow) elements between process and transmitters are within the scope
of this standard.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and
are indispensable for its application. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any
amendments) applies.
IEC 60671, Nuclear power plants – Instrumentation and control systems important to safety –
Surveillance testing
IEC 60780, Nuclear power plants – Electrical equipment of the safety system – Qualification

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SIST EN 62765-1:2018
IEC 62765-1:2015 © IEC 2015 – 9 –
IEC 61226, Nuclear power plants – Instrumentation and control importa
...