IEC 60671:2007

INTERNATIONAL IEC
STANDARD
CEI
NORME
Second edition
INTERNATIONALE
Deuxième édition
2007-05
Nuclear power plants – Instrumentation
and control systems important to safety –
Surveillance testing
Centrales nucléaires de puissance –
Systèmes d’instrumentation et de contrôle-
commande importants pour la sûreté –
Essais de surveillance
Reference number
Numéro de référence
IEC/CEI 60671:2007
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INTERNATIONAL IEC
STANDARD
CEI
NORME
Second edition
INTERNATIONALE
Deuxième édition
2007-05
Nuclear power plants – Instrumentation
and control systems important to safety –
Surveillance testing
Centrales nucléaires de puissance –
Systèmes d’instrumentation et de contrôle-
commande importants pour la sûreté –
Essais de surveillance
PRICE CODE
T
CODE PRIX
Commission Electrotechnique Internationale
International Electrotechnical Commission
МеждународнаяЭлектротехническаяКомиссия
For price, see current catalogue
Pour prix, voir catalogue en vigueur

– 2 – 60671 © IEC:2007
CONTENTS
FOREWORD.4
INTRODUCTION.6

1 Scope.8
2 Normative References .9
3 Terms and definitions .9
4 Basic Principles for Surveillance Testing .11
4.1 General .11
4.2 Gradation of Requirements Based on Category .12
4.3 Extent of Surveillance Testing .12
4.4 Self-supervision in Lieu of Periodic Testing .12
4.5 Continuous Operation in Lieu of Periodic Testing .13
5 General Requirements for Surveillance Testing .13
5.1 Design Requirements .13
5.2 Procedures.14
5.3 Data to be recorded upon detection of a fault .14
5.4 Other data to be recorded .14
5.5 Test intervals .15
5.6 Verification of actuation set-points.15
5.7 Bypass .15
5.8 Response time .15
5.9 Restoration.16
6 Requirements for Testing of Sensors and Signal Processing Devices.16
6.1 General .16
6.2 Non-tested parts.16
6.3 Testing devices .16
6.4 Signals .16
6.5 Variation of signals.17
6.5.1 General .17
6.5.2 Slowly changing signal .17
6.5.3 Rapidly changing signal.17
6.5.4 Large change in signal .17
6.6 Operability.17
6.7 Sensor response time.18
6.8 Testing equipment.18
6.9 Calibration and transfer function.18
6.10 Surveillance .18
7 Requirements for Testing of Electromechanical Equipment.18
7.1 General .18
7.2 Interface.18
7.3 Typical functional tests.19
7.4 Continuous monitoring.19
7.5 Relays and valves .19
8 Requirements for Testing of Logic Assemblies .20
8.1 Scope.20
8.2 General .20

60671 © IEC:2007 – 3 –
8.3 Switching of signals.20
8.4 Testing signals .20
8.5 Interface.21
8.6 Data to be displayed.21
8.7 Data to be recorded.21
8.8 Detailed display.21
8.9 Testing equipment.21
8.10 Testing equipment using pulses .22
9 Self-supervision in computer-based I&C systems .22
9.1 Coverage of self supervision .22
9.2 Balance of diagnostic versus functional processing .23
9.3 Watchdog timers .23
9.4 Action taken on detected fault .23
9.5 Categorization of self-supervision software .24

Figure 1 – Extent of I&C Surveillance Testing .9

– 4 – 60671 © IEC:2007
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
NUCLEAR POWER PLANTS –
INSTRUMENTATION AND CONTROL
SYSTEMS IMPORTANT TO SAFETY –
SURVEILLANCE TESTING
FOREWORD
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