oSIST prEN IEC 62705:2025

SLOVENSKI STANDARD
01-december-2025
Jedrski objekti - Merilna in nadzorna oprema za zagotavljanje varnosti - Sistemi za
nadzor sevanja (RMS) - Značilnosti in življenjski cikel
Nuclear facilities - Instrumentation and control important to safety - Radiation monitoring
systems (RMS): Characteristics and lifecycle
Kerntechnische Anlagen - Leittechnische Systeme mit sicherheitstechnischer Bedeutung
- Strahlungsüberwachungssysteme: Eigenschaften und Lebenszyklus
Installations nucléaires - Instrumentation et contrôle commande importants pour la
sûreté - Systèmes de surveillance des rayonnements (RMS): Caractéristiques et cycle
de vie
Ta slovenski standard je istoveten z: prEN IEC 62705:2025
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 62705
NORME EUROPÉENNE
EUROPÄISCHE NORM
October 2025
ICS 27.120.20 -
English Version
Nuclear facilities - Instrumentation and control important to
safety - Radiation monitoring systems (RMS): Characteristics
and lifecycle
(IEC 62705:2022)
Installations nucléaires - Instrumentation et contrôle Kerntechnische Anlagen - Leittechnische Systeme mit
commande importants pour la sûreté - Systèmes de sicherheitstechnischer Bedeutung -
surveillance des rayonnements (RMS): Caractéristiques et Strahlungsüberwachungssysteme: Eigenschaften und
cycle de vie Lebenszyklus
(IEC 62705:2022) (IEC 62705:2022)
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 62705:2022.

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: 82120 Ref. No. prEN IEC 62705:2025 E

European foreword
This document (prEN IEC 62705:2025) consists of the text of document IEC 62705:2022, 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 60532 - Radiation protection instrumentation - - -
Installed dose rate meters, warning
assemblies and monitors - X and gamma
radiation of energy between 50 keV and 7
MeV
IEC 60761-1 - Equipment for continuous monitoring of EN 60761-1 -
radioactivity in gaseous effluents - Part 1:
General requirements
IEC 60761-2 - Equipment for continuous monitoring of EN 60761-2 -
radioactivity in gaseous effluents - Part 2:
Specific requirements for radioactive
aerosol monitors including transuranic
aerosols
IEC 60761-3 - Equipment for continuous monitoring of EN 60761-3 -
radioactivity in gaseous effluents - Part 3:
Specific requirements for radioactive
noble gas monitors
IEC 60761-4 - Equipment for continuous monitoring of EN 60761-4 -
radioactivity in gaseous effluents - Part 4:
Specific requirements for radioactive
iodine monitors
IEC 60761-5 - Equipment for continuous monitoring of EN 60761-5 -
radioactivity in gaseous effluents - Part 5:
Specific requirements for tritium monitors
IEC 60768 - Nuclear power plants - Instrumentation - -
important to safety - Equipment for
continuous in-line or on-line monitoring of
radioactivity in process streams for normal
and incident conditions
IEC/IEEE 60780- 2016 Nuclear facilities - Electrical equipment EN 60780-323 2017
323 important to safety - Qualification
IEC 60861 - Equipment for monitoring of radionuclides EN 60861 -
in liquid effluents and surface waters
Publication Year Title EN/HD Year
IEC 60880 - Nuclear power plants - Instrumentation EN 60880 -
and control systems important to safety -
Software aspects for computer-based
systems performing category A functions
IEC 60951-1 2022 Nuclear facilities - Instrumentation - -
systems important to safety - Radiation
monitoring for accident and post-accident
conditions - Part 1: General requirements
IEC 60951-2 - Nuclear power plants - Instrumentation - -
important to safety - Radiation monitoring
for accident and post-accident conditions
- Part 2: Equipment for continuous off-line
monitoring of radioactivity in gaseous
effluents and ventilation air
IEC 60951-3 - Radiation monitoring equipment for - -
accident and post-accident conditions in
nuclear power plants. Part 3: High range
area gamma radiation dose rate
monitoring equipment
IEC 60951-4 - Centrales nucléaires de puissance - - -
Matériels de surveillance des
rayonnements pour les conditions
accidentelles et post-accidentelles.
Troisième partie: Ensembles de
surveillance locale du débit de dose de
rayonnement gamma à large gamme
IEC 60960 - Functional design criteria for a safety - -
parameter display system for nuclear
power stations
IEC/IEEE 60980- - Nuclear facilities - Equipment important to EN IEC/IEEE 60980-344 -
344 safety - Seismic qualification
IEC 60987 - Nuclear power plants - Instrumentation EN IEC 60987 -
and control important to safety - Hardware
requirements
IEC 61031 - Nuclear facilities - Instrumentation and EN IEC 61031 -
control systems - Design, location and
application criteria for installed area
gamma radiation dose rate monitoring
equipment for use during normal
operation and anticipated operational
occurrences
IEC 61226 2020 Nuclear power plants - Instrumentation, EN IEC 61226 2021
control and electrical power systems
important to safety - Categorization of
functions and classification of systems
IEC 61250 - Nuclear reactors - Instrumentation and - -
control systems important for safety -
Detection of leakage in coolant systems
IEC 61504 - Nuclear facilities - Instrumentation and - -
control systems important to safety -
Centralized systems for continuous
monitoring of radiation and/or levels of
radioactivity
Publication Year Title EN/HD Year
IEC 61513 2011 Nuclear power plants - Instrumentation EN 61513 2013
and control important to safety - General
requirements for systems
IEC 61559 series Radiation protection instrumentation in - -
nuclear facilities - Centralized systems for
continuous monitoring of radiation and/or
levels of radioactivity
IEC 62003 - Nuclear power plants - Instrumentation, EN IEC 62003 -
control and electrical power systems -
Requirements for electromagnetic
compatibility testing
IEC 62138 - Nuclear power plants - Instrumentation EN IEC 62138 -
and control systems important to safety -
Software aspects for computer-based
systems performing category B or C
functions
IEC 62302 - Radiation protection instrumentation - - -
Equipment for sampling and monitoring
radioactive noble gases
IEC 62303 - Radiation protection instrumentation - - -
Equipment for monitoring airborne tritium
IEC 62566 2012 Nuclear power plants - Instrumentation EN 62566 2014
and control important to safety -
Development of HDL-programmed
integrated circuits for systems performing
category A functions
IEC 62566-2 - Nuclear power plants - Instrumentation EN IEC 62566-2 -
and control important to safety -
Development of HDL-programmed
integrated circuits - Part 2: HDL-
programmed integrated circuits for
systems performing category B or C
functions
IEC 63147 2017 Criteria for accident monitoring - -
instrumentation for nuclear power
generating stations
ISO/IEC 17025 - General requirements for the competence EN ISO/IEC 17025 -
of testing and calibration laboratories
ISO 2889 - Sampling airborne radioactive materials - -
from the stacks and ducts of nuclear
facilities
ISO 4037-1 - Radiological protection - X and gamma EN ISO 4037-1 -
reference radiation for calibrating
dosemeters and doserate meters and for
determining their response as a function
of photon energy - Part 1: Radiation
characteristics and production methods
Publication Year Title EN/HD Year
ISO 4037-3 - Radiological protection - X and gamma EN ISO 4037-3 -
reference radiation for calibrating
dosemeters and doserate meters and for
determining their response as a function
of photon energy - Part 3: Calibration of
area and personal dosemeters and the
measurement of their response as a
function of energy and angle of incidence

IEC 62705 ®
Edition 2.0 2022-11
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Nuclear facilities – Instrumentation and control important to safety – Radiation

monitoring systems (RMS): Characteristics and lifecycle

Installations nucléaires – Instrumentation et contrôle commande importants

pour la sûreté – Systèmes de surveillance des rayonnements (RMS):

Caractéristiques et cycle de vie

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 27.120.20 ISBN 978-2-8322-5936-8

– 2 – IEC 62705:2022 © IEC 2022
CONTENTS
FOREWORD . 4
INTRODUCTION . 6
1 Scope . 9
2 Normative references . 9
3 Terms and definitions . 11
4 Symbols and abbreviated terms . 15
5 RMS categorization and classification . 16
5.1 Function categorization for RMS . 16
5.2 System classification for RMS . 16
5.3 Criteria for identifying the plant-specific variables . 16
6 RMS detailed design and implementation . 16
6.1 General .
...