1、 INTERNATIONAL STANDARD IECCEINORME INTERNATIONALE60671Second editionDeuxime dition2007-05Nuclear power plants Instrumentation and control systems important to safety Surveillance testing Centrales nuclaires de puissance Systmes dinstrumentation et de contrle-commande importants pour la sret Essais
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14、 avez des questions, visitez le FAQ du Service clients ou contactez-nous: Email: csciec.ch Tl.: +41 22 919 02 11 Fax: +41 22 919 03 00 INTERNATIONAL STANDARD IECCEINORME INTERNATIONALE60671Second editionDeuxime dition2007-05Nuclear power plants Instrumentation and control systems important to safety
15、 Surveillance testing Centrales nuclaires de puissance Systmes dinstrumentation et de contrle-commande importants pour la sret Essais de surveillance For price, see current cataloguePour prix, voir catalogue en vigueur PRICE CODE CODE PRIX T Commission Electrotechnique InternationaleInternational El
16、ectrotechnical Commission 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 Se
17、lf-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 Procedures14 5.3 Data to be recorded upon detection of a fault 14 5.4 Other data to be recorded .14 5.5 Test interv
18、als 15 5.6 Verification of actuation set-points.15 5.7 Bypass 15 5.8 Response time 15 5.9 Restoration16 6 Requirements for Testing of Sensors and Signal Processing Devices.16 6.1 General .16 6.2 Non-tested parts16 6.3 Testing devices .16 6.4 Signals16 6.5 Variation of signals17 6.5.1 General .17 6.5
19、.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 time18 6.8 Testing equipment.18 6.9 Calibration and transfer function18 6.10 Surveillance 18 7 Requirements for Testing of Electromechanical Equipment.18 7.1 General .
20、18 7.2 Interface18 7.3 Typical functional tests19 7.4 Continuous monitoring.19 7.5 Relays and valves .19 8 Requirements for Testing of Logic Assemblies .20 8.1 Scope20 8.2 General .20 60671 IEC:2007 3 8.3 Switching of signals.20 8.4 Testing signals 20 8.5 Interface21 8.6 Data to be displayed21 8.7 D
21、ata 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 any IEC National Committee interested in the subject dealt with may participate in this preparatory work. International, governmental and non-governmen
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28、ut of the publication, use of, or reliance upon, this IEC Publication or any other IEC Publications. 8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is indispensable for the correct application of this publication. 9) Attention is drawn
29、 to the possibility that some of the elements of this IEC Publication may be the subject of patent rights. IEC shall not be held responsible for identifying any or all such patent rights. International Standard IEC 60671 has been prepared by subcommittee 45A: Instrumentation and control of nuclear f
30、acilities, of IEC technical committee 45: Nuclear instrumentation. This second edition cancels and replaces the first edition published in 1980 and constitutes a technical revision. The main technical changes with respect to the previous edition are as follows: Expand scope to cover all systems impo
31、rtant to safety, and clarify requirement gradation for systems and equipment performing category A, B and C functions. Align with the new revisions of IAEA documents NS-R-1 and NS-G-1.3 (replacing D3 and D8). 60671 IEC:2007 5 Provide references to relevant normative standards. Harmonize terminology
32、with the existing standard hierarchy. Strengthen the role of computer self-supervision as an alternative to periodic surveillance testing. Introduce features of digital I test of a group of equipment or components to confirm properties that support the safety function (continuity, power availability
33、, 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 however, they may be combined with the surveillance testi
34、ng 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 safe
35、ty (in accordance with IEC 61513). 60671 IEC:2007 9 This standard applies to the I this subset is to be identified at the beginning of any project. Signal processingLogic assembly Actuatingdevice MSensor Extent of I operational bypass: a bypass of certain protective actions when they are not necessa
36、ry in a particular mode of plant operation IAEA Safety Glossary, Ed. 2.0 2006 NOTE 1 A maintenance bypass that is applied to a channel may still leave the safety function operable through redundancy and majority voting (e.g. two out of four coincidence logic becomes two out of three). NOTE 2 A maint
37、enance bypass is not the same as an operational bypass. A maintenance bypass may reduce the degree of redundancy of equipment, but it does not result in the loss of a safety function. 3.4 full functional test test that includes perturbation of the process variable, detection by the sensor, processin
38、g of the signal(s), actuation of the appropriate sub-assemblies, logic assemblies and actuation devices 3.5 functional reliability ability to comply with requirements on complete and correct functionality and performance in: a) all defined plant operational modes and conditions, b) in all defined pl
39、ant I the state after switching is stable and correct; the time delay or the time constant has the correct value. 5.2 Procedures Periodic tests shall be made on the basis of carefully prepared test programmes in which identification of the tested parts, test conditions including initial plant state,
40、 test procedures and test periods are stated. 5.3 Data to be recorded upon detection of a fault Upon detection of a fault at least the following data shall be recorded: identification of the tested part; test device description; detectable fault combinations; date and time of the test during which f
41、aults have been detected; period between this test and the previous test that would have permitted the detection of the faults; type of failure which could be caused by the fault in case of demand; operating mode of I authorization signature(s); title of test programme; action taken when fault is de
42、tected. 5.4 Other data to be recorded 5.4.1 After each test where no fault was detected at least the following data shall be recorded: test frequency (for automatic tests only); test schedule used; date, time and duration of the test (for manually initiated tests); identification of tested equipment
43、. NOTE It is recommended that statistical data related to the test results be carefully recorded and analyzed to give realistic “failure rate” data. When such data become available with a reasonable confidence level, they should be compared with the frequency of testing to determine whether modifica
44、tion of the frequency in either direction is appropriate. 60671 IEC:2007 15 5.4.2 Any non-safety relevant values that can be measured during the surveillance tests should be analysed from the maintenance point of view and recorded. The only limitation of these measurements is that they shall not jeo
45、pardise the safety surveillance testing. 5.5 Test intervals The test interval is the relevant design parameter for the demonstration that reliability and availability goals are met for the system under consideration. The test intervals shall be based on mathematical relations involving the reliabili
46、ty and availability goals, the type of system architecture, the expected fault-rate or experienced fault-rate, test duration and permissible system unavailability. 5.6 Verification of actuation set-points 5.6.1 Testing to verify actuation set-points that are continuously calculated or likewise testi
47、ng to verify a calculated complex safety function with a fixed set-point level shall be performed by manipulating each variable that enters into the computation. While the signal for one or more variables is being varied to achieve actuation or change in computer output, the signals for the other va
48、riables should be adjusted to normal expected values for the actuation condition. 5.6.2 For computer-based I for example, testing the actuation device for a system pump separately from the actuation device for the system valves. 7.2.3 The operation of certain actuated equipment shall be prevented du
49、ring a test of the related actuation devices; for example, moving the circuit breaker for a pump to a test position that prevents power from being supplied to the pump during a test closure of its circuit breaker. Operation of the actuated equipment itself shall be tested when plant conditions permit in a way that overlaps this test. 7.2.4 Operation of the actu
