IEC 60951-1:2009

Nuclear power plants - Instrumentation important to safety - Radiation monitoring for accident and post-accident conditions - Part 1: General requirements

IEC 60951-1:2009 provides general guidance on the design principles and performance criteria for equipment to measure radiation and fluid (gaseous effluents or liquids) radioactivity levels at nuclear power plants during and after an accident. It specifies the general characteristics, general test procedures, radiation, electrical, safety and environmental characteristics and the identification and certification of the equipment. The main technical changes with regard to the previous edition are as follows:
- clarify the definitions;
- up-date the references to new standards published since the first edition;
- update the units of radiation.

Centrales nucléaires de puissance - Instrumentation importante pour la sûreté - Surveillance des rayonnements pour les conditions accidentelles et post-accidentelles - Partie 1: Exigences générales

La CEI 60951-1:2009 établit des recommandations générales applicables aux principes de conception et aux critères de performance des matériels de mesure des rayonnements et du niveau de radioactivité des fluides (effluents gazeux ou liquides) dans les centrales nucléaires de puissance pendant et après un accident. Elle spécifie les caractéristiques générales, les procédures d'essai générales, les caractéristiques électriques, celles liées à la sûreté, aux rayonnements et à l'environnement ainsi que celles liées à l'identification et la certification des matériels. Les principaux changements techniques par rapport à l'édition précédente sont les suivants:
- clarifier les définitions;
- mettre à jour les références aux nouvelles normes publiées depuis la première édition;
- mettre à jour les unités relatives aux rayonnements.

General Information

• Status: Published
• Publication Date: 28-Jun-2009
• ICS: 01 - GENERALITIES. TERMINOLOGY. STANDARDIZATION. DOCUMENTATION
• ICS: 27.120.20 - Nuclear power plants. Safety
• Technical Committee: SC 45A - Instrumentation, control and electrical power systems of nuclear facilities
• Drafting Committee: WG 5 - TC 45/SC 45A/WG 5
• Current Stage: DELPUB - Deleted Publication
• Start Date: 01-Jun-2020
• Completion Date: 24-Nov-2022

Relations

• Revised: IEC 60951-1:2022 - Nuclear facilities - Instrumentation systems important to safety - Radiation monitoring for accident and post-accident conditions - Part 1: General requirements
• Effective Date: 05-Sep-2023

Standards Content (Sample)

IEC 60951-1 ®
Edition 2.0 2009-06
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Nuclear power plants – Instrumentation important to safety – Radiation
monitoring for accident and post-accident conditions –
Part 1: General requirements
Centrales nucléaires de puissance – Instrumentation importante pour la sûreté –
Surveillance des rayonnements pour les conditions accidentelles et post-
accidentelles –
Partie 1: Exigences générales
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IEC 60951-1 ®
Edition 2.0 2009-06
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Nuclear power plants – Instrumentation important to safety – Radiation
monitoring for accident and post-accident conditions –
Part 1: General requirements
Centrales nucléaires de puissance – Instrumentation importante pour la sûreté –
Surveillance des rayonnements pour les conditions accidentelles et post-
accidentelles –
Partie 1: Exigences générales
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
X
CODE PRIX
ICS 27.120.20 ISBN 978-2-88910-346-1
– 2 – 60951-1 © IEC:2009
CONTENTS
FOREWORD.4
INTRODUCTION.6
1 Scope.8
2 Normative references .8
3 Terms and definitions .9
4 Design principles.14
4.1 Basic requirements related to functions .14
4.2 Measurement range .16
4.3 Energy response .16
4.4 Minimum detectable activity (or limit of detection).16
4.5 Precision (or repeatability).16
4.6 Accuracy (or relative error).17
4.7 Measurement time.17
4.8 Response time .17
4.9 Overload performance.18
4.10 Ambient background shielding or compensation devices .18
4.11 Requirements related to accident conditions .18
4.12 Reliability .19
4.13 User interface.19
4.13.1 General .19
4.13.2 Display of measured value.19
4.13.3 Alarms.19
4.13.4 Status indication.20
4.13.5 Local indications.20
4.14 System testing, maintenance facilities and ease of decontamination .21
4.14.1 System testing.21
4.14.2 Maintenance facilities .21
4.14.3 Ease of decontamination .21
4.15 Electromagnetic interference .21
4.16 Power supplies.22
4.17 Interfaces .22
4.18 Sampling assembly .22
4.19 Quality .23
4.20 Type test report and certificate .24
5 Functional testing .25
5.1 General .25
5.2 General test procedures .25
5.2.1 General .25
5.2.2 Tests performed under standard test conditions .25
5.2.3 Tests performed with variation of influence quantities.25
5.2.4 Calculations and/or numerical simulations .26
5.2.5 Reference sources .26
5.2.6 Statistical fluctuations.28
5.3 Performance characteristics .28
5.3.1 Reference response .28
5.3.2 Sensitivity and relative response for solid sources.28

60951-1 © IEC:2009 – 3 –
5.3.3 Accuracy (relative error) .29
5.3.4 Response to other artificial radionuclides .30
5.3.5 Response to background radiation.30
5.3.6 Precision (or repeatability).31
5.3.7 Stability of the indication .31
5.3.8 Response time .31
5.3.9 Overload test.32
5.4 Electrical performance tests .33
5.4.1 Alarm trip range.33
5.4.2 Alarm trip stability.33
5.4.3 Fault alarm .33
5.4.4 Status indication and fault alarm tests .34
5.4.5 Warm-up time — Detection and measuring assembly .34
5.4.6 Influence of supply variations .34
5.4.7 Short circuit withstand tests.35
5.5 Environmental performance test .35
5.5.1 Stability of performance after storage .35
5.5.2 Mechanical tests.36
5.5.3 Stability of performance with variation of temperature and humidity.37
5.5.4 Electromagnetic compatibility .39
Bibliography.44

Table 1 – Overview of the standards covering the domain of radiation monitoring.6
Table 2 – Reference conditions and standard test conditions .41
Table 3 – Tests performed under standard test conditions .42
Table 4 – Tests performed with variation of influence quantities.43

– 4 – 60951-1 © IEC:2009
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
NUCLEAR POWER PLANTS –
INSTRUMENTATION IMPORTANT TO SAFETY –
RADIATION MONITORING FOR ACCIDENT
AND POST-ACCIDENT CONDITIONS –

Part 1: General requirements
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 Guide
...