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IEC 60768:2009

(Main)

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

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 60768:2009 provides criteria for the design, selection, testing, calibration and functional location of equipment for the monitoring of radioactive substances within plant-process streams during normal operation conditions and anticipated operational occurrences. Is only applicable to continuous in-line or on-line measurement. This new edition includes the following significant technical changes with respect to the previous edition:
- it clarifies the definitions;
- up-dates the reference to new standards published since the first issue;
- updates the units of radiation.
This publication is to be read in conjunction with IEC 60951-1:2009, IEC 60951-2:2009, IEC 60951-3:2009 and IEC 60951-4:2009.

Centrales nucléaires de puissance - Instrumentation importante pour la sûreté - Matériels pour la surveillance des rayonnements en continu, interne et externe, au niveau des fluides de procédés pour les conditions de fonctionnement normal et incidentel

La CEI 60768:2009 établit des recommandations applicables à la conception, aux choix, aux essais, à l'étalonnage et à l'emplacement fonctionnel de l'équipement de surveillance des matières radioactives présentes dans les fluides de processus des centrales en condition de fonctionnement normal et durant les incidents de fonctionnement prévus. Est uniquement applicable aux mesures internes ou externes faites en continu. Cette nouvelle édition inclut les modifications techniques majeures suivantes par rapport à l'édition précédente:
- clarifie les définitions;
- met à jour les références aux nouvelles normes publiées depuis la première édition;
- met à jour les unités relatives aux rayonnements.
Cette publication doit être lue conjointement avec la CE I 60951-1:2009, la CEI 60951-2:2009, la CEI 60951-3:2009 et la CEI 60951-4:2009.

General Information

Status
Published
Publication Date
28-Apr-2009
ICS
01 - GENERALITIES. TERMINOLOGY. STANDARDIZATION. DOCUMENTATION
27.120.10 - Reactor engineering
Technical Committee
SC 45A - Instrumentation, control and electrical power systems of nuclear facilities
Current Stage
PPUB - Publication issued
Start Date
15-May-2009
Completion Date
29-Apr-2009
Ref Project

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IEC 60768:2009 - 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 conditionsIEC 60768:2009 - 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
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IEC 60768:2009 - 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
English and French language
79 pages
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IEC 60768 ®
Edition 2.0 2009-04
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
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

Centrales nucléaires de puissance – Instrumentation importante pour la sûreté –
Matériels pour la surveillance des rayonnements en continu, interne et externe,
au niveau des fluides de procédés pour les conditions de fonctionnement
normal et incidentel
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IEC 60768 ®
Edition 2.0 2009-04
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
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

Centrales nucléaires de puissance – Instrumentation importante pour la sûreté –
Matériels pour la surveillance des rayonnements en continu, interne et externe,
au niveau des fluides de procédés pour les conditions de fonctionnement
normal et incidentel
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
W
CODE PRIX
ICS 27.120.20 ISBN 978-2-88910-288-4
– 2 – 60768 © IEC:2009
CONTENTS
FOREWORD.4
INTRODUCTION.6
1 Scope.8
2 Normative references .8
3 Terms and definitions .10
4 Design principles.10
4.1 Basic requirements related to functions .10
4.2 Measurement range .11
4.3 Energy response .11
4.4 Minimum detectable activity (or detection limit) .12
4.5 Precision (or repeatability).12
4.6 Accuracy (or relative error).12
4.7 Measurement time.13
4.8 Response time .13
4.9 Overload performance.13
4.10 Ambient background shielding or compensation devices .13
4.11 Requirements related to incident conditions .14
4.12 Reliability .14
4.13 User interface.14
4.13.1 General .14
4.13.2 Display of measured value.15
4.13.3 Alarms.15
4.13.4 Status indication.15
4.13.5 Local indications.16
4.14 System testing, maintenance facilities and ease of decontamination .16
4.14.1 System testing.16
4.14.2 Maintenance facilities .16
4.14.3 Ease of decontamination .17
4.15 Electromagnetic interference .17
4.16 Power supplies.17
4.17 Interfaces .17
4.18 In-line detectors mechanical features.18
4.18.1 General requirements .18
4.18.2 Pressure-containing parts.18
4.18.3 Materials .18
4.18.4 Verification of material processing .19
4.19 Quality .19
4.20 Type test report and certificate .19
5 Functional testing .20
5.1 General .20
5.2 General test procedures .21
5.2.1 General .21
5.2.2 Tests performed under standard test conditions .21
5.2.3 Tests performed with variation of influence quantities.21
5.2.4 Calculations and/or numerical simulations .21
5.2.5 Reference sources .22

60768 © IEC:2009 – 3 –
5.2.6 Statistical fluctuations.22
5.3 Performance characteristics .23
5.3.1 Reference response .23
5.3.2 Accuracy (relative error) .23
5.3.3 Response to other artificial radionuclides .24
5.3.4 Response to background radiation.24
5.3.5 Precision (or repeatability).25
5.3.6 Stability of the indication .25
5.3.7 Response time .25
5.3.8 Overload test.26
5.4 Electrical performance tests .26
5.4.1 Alarm trip range.26
5.4.2 Alarm trip stability.27
5.4.3 Fault alarm .27
5.4.4 Status indication and fault alarm tests .27
5.4.5 Warm-up time – Detection and measuring assembly.27
5.4.6 Influence of supply variations .28
5.4.7 Short circuit withstand tests.29
5.5 Environmental performance test .29
5.5.1 Stability of performance after storage .29
5.5.2 Mechanical tests.30
5.5.3 Stability of performance with variation of ambient and stream
conditions.31
5.5.4 Electromagnetic compatibility .33
Bibliography.39

Table 1 – Reference conditions and standard test conditions .36
Table 2 – Tests performed under standard test conditions .37
Table 3 – Tests performed with variation of influence quantities.38

– 4 – 60768 © IEC:2009
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
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 COND
...

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