IEC 60671:2007

Nuclear power plants - Instrumentation and control systems important to safety - Surveillance testing

Lays down principles for testing I&C systems performing category A, B and C functions, per IEC 61226, during normal power operation and shutdown, so as to check the functional availability especially with regard to the detection of faults that could prevent the proper operation of the functions important to safety. Covers the possibility of testing at short intervals or continuous surveillance, as well as periodic testing at longer intervals. It also establishes basic rules for the design and application of the test equipment and its interface with the systems important to safety. The main change with respect to the previous edition includes an extension of the scope to cover all systems important to safety, and a requirement gradation for systems and equipment performing category A, B and C functions.

Centrales nucléaires de puissance - Systèmes d'instrumentation et de contrôle-commande importants pour la sûreté - Essais de surveillance

Etablit les principes applicables aux systèmes d'I&C réalisant des fonctions de catégories A, B ou C, telles que définies par la CEI 61226, durant le fonctionnement normal en puissance ou les arrêts de l'installation, de façon à en vérifier la disponibilité fonctionnelle en particulier en ce qui concerne la détection des défauts qui pourraient empêcher le bon fonctionnement des fonctions importantes pour la sûreté. Traite des capacités d'essais réalisés à intervalles courts ou de surveillance continue, aussi bien que d'essais périodiques réalisés à intervalles plus longs. Etablit aussi les règles de base de conception et de réalisation des essais matériels et de leur interface avec les systèmes importants pour la sûreté. Le changement technique principal par rapport à l'édition précédente est une extension du domaine de la norme pour couvrir tous les systèmes importants pour la sûreté, et la gradation des exigences pour les systèmes et matériels réalisant des fonctions de catégorie A, B ou C.

General Information

• Status: Published
• Publication Date: 22-May-2007
• 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 7 - TC 45/SC 45A/WG 7
• Current Stage: PPUB - Publication issued
• Start Date: 15-Sep-2007
• Completion Date: 23-May-2007

Standards Content (Sample)

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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