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BS EN 60671:2011

Current

Current

The latest, up-to-date edition.

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

Available format(s)

Hardcopy , PDF

Language(s)

English

Published date

31-10-2011

€217.36
Excluding VAT

INTRODUCTION
1 Scope
2 Normative References
3 Terms and definitions
4 Basic Principles for Surveillance Testing
5 General Requirements for Surveillance Testing
6 Requirements for Testing of Sensors and Signal
  Processing Devices
7 Requirements for Testing of Electromechanical
  Equipment
8 Requirements for Testing of Logic Assemblies
9 Self-supervision in computer-based I&C systems
Annex ZA (normative) - Normative references to
         international publications with their
         corresponding European publications

Defines the possibility of testing at short intervals or continuous surveillance, as well as periodic testing at longer intervals.

Committee
NCE/8
DevelopmentNote
Renumbers and supersedes BS IEC 60671. 2011 version incorporates corrigendum to BS IEC 60671. (10/2011)
DocumentType
Standard
Pages
28
PublisherName
British Standards Institution
Status
Current
Supersedes

Where functional reliability is required by general safety standards, one aspect of demonstrating this reliability is testing performed on-line during plant operation or during plant shutdown in preparation for return to power operation. This standard 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. It 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. Further, the effect of any test equipment failure on the reliability of the I&C systems is considered. Types of surveillance tests may include: self-tests for I&C equipment; test of a group of equipment or components to confirm properties that support the safety function (continuity, power availability, etc.); test based on information redundancy or comparison of control signatures (consistency checking for redundant sensors, CRC-checking, Checksum, etc.); periodic testing which is related to the correctness of functional behaviour of an I&C system. The dependability targets of any I&C system is reached using an appropriate combination of tests of the form indicated above. The extent of the I&C system to be tested is from the interface of the sensors with the process through to the actuation devices (see Figure 1). It is applicable to the installed I&C systems as well as to temporary installations which are part of those I&C systems important to safety (for example, auxiliary equipment for commissioning tests and experiments). This standard also applies to individual electromechanical equipment, such as relays and solenoid actuators. Additional testing and inspections may be performed on I&C equipment for purposes other than the demonstration of functional capability, such as to optimise preventive maintenance, etc. Such tests are beyond the scope of this standard; however, they may be combined with the surveillance testing discussed herein. For any on-line tests the potential interaction and fault dependencies between the part of the system under test and the testing part, have to be carefully studied and their influences have to be fully integrated into the reliability assessment of the functions important to safety (in accordance with IEC 61513). This standard applies to the I&C of new nuclear power plants as well as to I&C upgrading or back-fitting of existing plants. For I&C upgrades, only a subset of the requirements may be applicable; this subset is to be identified at the beginning of any project.

Standards Relationship
IEC 60730-1:2013/COR1:2014 Identical
EN 60671:2011 Identical

IEC 61226:2009 Nuclear power plants - Instrumentation and control important to safety - Classification of instrumentation and control functions
IEC 62138:2004 Nuclear power plants - Instrumentation and control important for safety - Software aspects for computer-based systems performing category B or C functions
EN 61226:2010 Nuclear power plants - Instrumentation and control important to safety - Classification of instrumentation and control functions
IEC 60987:2007+AMD1:2013 CSV Nuclear power plants - Instrumentation and control important to safety - Hardware design requirements for computer-based systems
EN 60987:2015 Nuclear power plants - Instrumentation and control important to safety - Hardware design requirements for computer-based systems
EN 62138:2009 NUCLEAR POWER PLANTS - INSTRUMENTATION AND CONTROL IMPORTANT FOR SAFETY - SOFTWARE ASPECTS FOR COMPUTER-BASED SYSTEMS PERFORMING CATEGORY B OR C FUNCTIONS
EN 60880:2009 NUCLEAR POWER PLANTS - INSTRUMENTATION AND CONTROL SYSTEMS IMPORTANT TO SAFETY - SOFTWARE ASPECTS FOR COMPUTER-BASED SYSTEMS PERFORMING CATEGORY A FUNCTIONS
IEC 60880:2006 Nuclear power plants - Instrumentation and control systems important to safety - Software aspects for computer-based systems performing category A functions
IEC 61513:2011 Nuclear power plants - Instrumentation and control important to safety - General requirements for systems

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