BS-IEC-62340-2007.pdf
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1、BRITISH STANDARD BS IEC 62340:2007 Nuclear power plants Instrumentation and control systems important to safety Requirements for coping with common cause failure (CCF) ICS 27.120.20 ? Copyright British Standards Institution Provided by IHS under license with BSI - Uncontrolled Copy Licensee=Boeing C
2、o/5910770001 Not for Resale, 08/14/2008 21:58:14 MDTNo reproduction or networking permitted without license from IHS -,-,- BS IEC 62340:2007 This British Standard was published under the authority of the Standards Policy and Strategy Committee on 31 March 2008 BSI 2008 ISBN 978 0 580 53406 5 Nationa
3、l foreword This British Standard is the UK implementation of IEC 62340:2007. The UK participation in its preparation was entrusted to Technical Committee NCE/8, Reactor instrumentation. A list of organizations represented on this committee can be obtained on request to its secretary. This publicatio
4、n does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. Compliance with a British Standard cannot confer immunity from legal obligations. Amendments/corrigenda issued since publication DateComments Copyright British Standards Insti
5、tution Provided by IHS under license with BSI - Uncontrolled Copy Licensee=Boeing Co/5910770001 Not for Resale, 08/14/2008 21:58:14 MDTNo reproduction or networking permitted without license from IHS -,-,- IEC 62340 Edition 1.0 2007-12 INTERNATIONAL STANDARD Nuclear power plants Instrumentation and
6、control systems important to safety Requirements for coping with common cause failure (CCF) BS IEC 62340:2007 Copyright British Standards Institution Provided by IHS under license with BSI - Uncontrolled Copy Licensee=Boeing Co/5910770001 Not for Resale, 08/14/2008 21:58:14 MDTNo reproduction or net
7、working permitted without license from IHS -,-,- CONTENTS INTRODUCTION.3 1 Scope.5 2 Normative references .6 3 Terms and definitions .6 4 Abbreviations .10 5 Conditions and strategy to cope with CCF 11 5.1 General.11 5.2 Characteristics of CCF 11 5.3 Principal mechanisms for CCF of digital I b) to a
8、dditionally require the implementation of independent I c) to give an overview of the complete scope of requirements relevant to CCF, but not to overlap with fields already addressed in other standards. These are referenced. This standard emphasises the need for the complete and precise specificatio
9、n of the safety functions, based on the analysis of design basis accidents and consideration of the main plant safety goals. This specification is the pre-requisite for generating a comprehensive set of detailed requirements for the design of I b) between I c) between redundant channels of the same
10、I b) propagation of physical effects in the hardware (e.g. high voltages); and c) avoidance of specific faults and vulnerabilities within the I b) the ability of the systems to perform their functions is unaffected by the presence of the effects resulting from the postulated initiating event for whi
11、ch they are required to function; c) adequate robustness against common external influences (e.g. from earthquake and EMI) is assured by the design of the systems modified definition of “independent equipment” from IAEA Safety Glossary, Ed. 2.0, 2006 NOTE Means to achieve independence by the design
12、are electrical isolation, physical separation, communications independence and freedom of interference from the process to be controlled. 3.13 input signal transient time behaviour of all process signals which are fed into the I the system is caused to stop its processing, so no response can be give
13、n. 5.4 Conditions to defend against CCF of individual I b) latent faults which are introduced during maintenance because the possibility for analysing and testing modifications may be limited under plant constraints (e.g. modification of set- points, use of revised versions of spare-parts or the up-
14、grading of I and BS IEC 62340:2007 12 Copyright British Standards Institution Provided by IHS under license with BSI - Uncontrolled Copy Licensee=Boeing Co/5910770001 Not for Resale, 08/14/2008 21:58:14 MDTNo reproduction or networking permitted without license from IHS -,-,- c) the triggering of la
15、tent faults during maintenance activities by causing partly specific system states or partly invalid data which do not represent the actual plant status. Depending on the I e) for digital technology the failure propagation via high voltages can be excluded if fibre optics are applied but specific me
16、ans are required to reduce susceptibilities to failure propagation from erroneous or missing data. This standard gives guidance for reducing the possibility of the existence of mechanisms that could support the triggering of postulated types of latent design faults to cause CCF during transients (se
17、e Clauses 7, 8 and 9). To reduce the likelihood that latent design faults may remain in the final I the exclusion of latent faults may be possible for very small and simple software modules so that a fault analysis and adequate testing can be performed. BS IEC 62340:2007 16 Copyright British Standar
18、ds Institution Provided by IHS under license with BSI - Uncontrolled Copy Licensee=Boeing Co/5910770001 Not for Resale, 08/14/2008 21:58:14 MDTNo reproduction or networking permitted without license from IHS -,-,- 7.3.2 Independent I invariance of processing load and communication load; avoidance of
19、 interrupts triggered by process data (for the generally restricted use of interrupts, see Clause B.2 of IEC 60880). 8.2 The (application) software shall be designed to be tolerant of invalid input signals, singly or in groups or due to spurious short-term transients on the input signals, such that
20、safe action is ensured but spurious actuations are avoided. 8.3 Invalid or faulty input signals shall be identified on-line. If faulty signals are identified and processed by comparison of redundant information, then the dependencies thus introduced between redundant sub-systems shall be analysed fo
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