1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI British StandardsWB9423_BSI_StandardColCov_noK_AW:BSI FRONT COVERS 5/9/08 12:55 Page 1Nuclear power plants Instrumentation important tosafety Radiation monitoringfor accident and post-accidentconditi
2、ons Part 4: Equipment for continuous in-line or on-linemonitoring of radioactivity in process streamsBS IEC 60951-4:2009National forewordThis British Standard is the UK implementation of IEC 60951-4:2009.The UK participation in its preparation was entrusted to Technical CommitteeNCE/8, Reactor instr
3、umentation.A list of organizations represented on this committee can be obtained onrequest to its secretary.This publication does not purport to include all the necessary provisions of acontract. Users are responsible for its correct application. BSI 2009ISBN 978 0 580 68958 1ICS 13.280; 17.240; 27.
4、120.20Compliance with a British Standard cannot confer immunity fromlegal obligations.This British Standard was published under the authority of the StandardsPolicy and Strategy Committee on 30 September 2009Amendments issued since publicationAmd. No. Date Text affectedBRITISH STANDARDBS IEC 60951-4
5、:2009IEC 60951-4Edition 2.0 2009-06INTERNATIONAL STANDARD NORME INTERNATIONALENuclear power plants Instrumentation important to safety Radiation monitoring for accident and post-accident conditions Part 4: Equipment for continuous in-line or on-line monitoring of radioactivity in process streams Cen
6、trales nuclaires de puissance Instrumentation importante pour la sret Surveillance des rayonnements pour les conditions accidentelles et post-accidentelles Partie 4: Equipement pour la surveillance en continu des rayonnements internes ou externes aux flux de procd INTERNATIONAL ELECTROTECHNICAL COMM
7、ISSION COMMISSION ELECTROTECHNIQUE INTERNATIONALE MICS 27.120.20 PRICE CODECODE PRIXISBN 2-8318-1046-4 Registered trademark of the International Electrotechnical Commission Marque dpose de la Commission Electrotechnique Internationale 2 60951-4 IEC:2009 CONTENTS FOREWORD.3 INTRODUCTION.5 1 Scope.7 2
8、 Normative references .7 3 Terms and definitions .7 4 Design principles8 4.1 General .8 4.2 Basic requirements related to functions.8 4.3 Range of measurement .8 4.4 In-line detectors mechanical features.8 4.4.1 General requirements 8 4.4.2 Pressure-containing parts9 4.4.3 Materials .9 4.4.4 Verific
9、ation of material processing.9 5 Functional testing .10 5.1 General .10 5.2 Environmental performance test 10 5.2.1 Stability of performances with variation of ambient and stream conditions10 Table 1 Overview of the standards covering the domain of radiation monitoring.5 Table 2 Additional tests to
10、complement the general tests required in IEC 60951-1.12 BS IEC 60951-4:200960951-4 IEC:2009 3 INTERNATIONAL ELECTROTECHNICAL COMMISSION _ NUCLEAR POWER PLANTS INSTRUMENTATION IMPORTANT TO SAFETY RADIATION MONITORING FOR ACCIDENT AND POST-ACCIDENT CONDITIONS Part 4: Equipment for continuous in-line o
11、r on-line monitoring of radioactivity in process streams FOREWORD 1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising all national electrotechnical committees (IEC National Committees). The object of IEC is to promote international co-ope
12、ration on all questions concerning standardization in the electrical and electronic fields. To this end and in addition to other activities, IEC publishes International Standards, Technical Specifications, Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to a
13、s “IEC Publication(s)”). Their preparation is entrusted to technical committees; any IEC National Committee interested in the subject dealt with may participate in this preparatory work. International, governmental and non-governmental organizations liaising with the IEC also participate in this pre
14、paration. IEC collaborates closely with the International Organization for Standardization (ISO) in accordance with conditions determined by agreement between the two organizations. 2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international con
15、sensus of opinion on the relevant subjects since each technical committee has representation from all interested IEC National Committees. 3) IEC Publications have the form of recommendations for international use and are accepted by IEC National Committees in that sense. While all reasonable efforts
16、 are made to ensure that the technical content of IEC Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any misinterpretation by any end user. 4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
17、 transparently to the maximum extent possible in their national and regional publications. Any divergence between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in the latter. 5) IEC provides no marking procedure to indicate its approval and can
18、not be rendered responsible for any equipment declared to be in conformity with an IEC Publication. 6) All users should ensure that they have the latest edition of this publication. 7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and m
19、embers of its technical committees and IEC National Committees for any personal injury, property damage or other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and expenses arising out of the publication, use of, or reliance upon, this IEC Publicatio
20、n 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 to the possibility that some of the elements of this IEC Publicatio
21、n may be the subject of patent rights. IEC shall not be held responsible for identifying any or all such patent rights. International Standard IEC 60951-4 has been prepared by subcommittee 45A: Instrumentation and control of nuclear facilities, of IEC technical committee 45: Nuclear instrumentation.
22、 This second edition of IEC 60951-4 cancels and replaces the first edition issued in 1991. It constitutes a technical revision. The main technical changes with regard to the previous edition are as follows: To clarify the definitions. To update the references to new standards published since the fir
23、st issue. To update the units of radiation. BS IEC 60951-4:2009 4 60951-4 IEC:2009 This standard is to be read in conjunction with IEC 60951-1. The text of this standard is based on the following documents: FDIS Report on voting 45A/737/FDIS 45A/759/RVDFull information on the voting for the approval
24、 of this standard can be found in the report on voting indicated in the above table. This publication has been drafted in accordance with the ISO/IEC Directives, Part 2. A list of all parts of IEC 60951 series, under the general title Nuclear power plants Instrumentation important to safety Radiatio
25、n monitoring for accident and post-accident conditions, can be found on the IEC website. The committee has decided that the contents of this publication will remain unchanged until the maintenance result date indicated on the IEC web site under “http:/webstore.iec.ch“ in the data related to the spec
26、ific publication. At this date, the publication will be reconfirmed, withdrawn, replaced by a revised edition, or amended. BS IEC 60951-4:200960951-4 IEC:2009 5 INTRODUCTION a) Technical background, main issues and organisation of this standard This IEC standard specifically focuses on radiation mon
27、itoring systems used for accident and post-accident operations. This standard is intended for use by purchasers in developing specifications for their plant-specific radiation monitoring systems and by manufacturers to identify needed product characteristics when developing systems for accident moni
28、toring conditions. Some specific instrument characteristics such as measurement range, required energy response, and ambient environment requirements will depend upon the specific application. In such cases guidance is provided on determining the specific requirements, but specific requirements them
29、selves are not stated. This standard is one in a series of standards covering post-accident radiation monitors important to safety. The full series is comprised of the following standards. IEC 60951-1 General requirements IEC 60951-2 Equipment for continuous off-line monitoring of radioactivity in g
30、aseous effluents and ventilation air IEC 60951-3 Equipment for continuous high range area gamma monitoring IEC 60951-4 Equipment for continuous in-line or on-line monitoring of radioactivity in process streams b) Situation of the current standard in the structure of the IEC SC 45A standard series IE
31、C 60951 series of standards are at the third level in the hierarchy of SC 45A standards. They provide guidance on the design and testing of radiation monitoring equipment used for accident and post-accident conditions. Other standards developed by SC 45A and SC 45B provide guidance on instruments us
32、ed for monitoring radiation as part of normal operations. IEC 60761 series provide requirements for equipment for continuous off-line monitoring of radioactivity in gaseous effluents in normal conditions. IEC 60861 provides requirements for equipment for continuous off-line monitoring of radioactivi
33、ty in liquid effluents in normal conditions. IEC 60768 provides requirements for equipment for continuous in-line and on-line monitoring of radioactivity in process streams in normal and incident conditions. Finally, ISO 2889 gives guidance on gas and particulate sampling. The relationship between t
34、hese various radiation monitoring standards is given in Table 1 below: Table 1 Overview of the standards covering the domain of radiation monitoring Developer ISO SC 45A Process and safety monitoring Scope Sampling circuits and methods Accident and post-accident conditions Normal and incident condit
35、ions SC 45B Radiation protection and effluents monitoring Gas, particulate and iodine with sampling (OFF LINE) ISO 2889 IEC 60951-1 and IEC 60951-2 IEC 60761 series and IEC 62302 (noble gases only) Liquid with sampling (OFF LINE) N/A N/A IEC 60861 Process streams (gaseous effluents, steam or liquid)
36、 without sampling (ON or IN-LINE) N/A IEC 60951-1 and IEC 60951-4 IEC 60768 N/A Area monitoring N/A IEC 60951-1 and IEC 60951-3 IEC 60532 BS IEC 60951-4:2009 6 60951-4 IEC:2009 Developer ISO SC 45A Process and safety monitoring Scope Sampling circuits and methods Accident and post-accident condition
37、s Normal and incident conditions SC 45B Radiation protection and effluents monitoring Central system N/A IEC 61504 IEC 61559 For more details on the structure of the IEC SC 45A standard series, see item d) of this introduction. c) Recommendations and limitations regarding the application of this sta
38、ndard It is important to note that this Standard establishes no additional functional requirements for safety systems. d) Description of the structure of the IEC SC 45A standard series and relationships with other IEC documents and other bodies documents (IAEA, ISO) The top-level document of the IEC
39、 SC 45A standard series is IEC 61513. It provides general requirements for I b) internal examination of the casing after running of test; c) installation dimensions; d) auxiliary or additional equipment; e) chemical composition: according to manufacturers standard specification or with specimen per
40、melt; BS IEC 60951-4:2009 10 60951-4 IEC:2009 f) mechanical properties: according to manufacturers standard specification or with specimen per melt and heat treatment; g) susceptibility to intergranular attack (where applicable); h) non-destructive tests (leakage, ultrasonic, dye penetrant, magnetic
41、 particle, radiographic, spectroscopic identification, etc.). All pressurised parts, including their fasteners, shall meet the same mechanical performances as the pipe or tank on which they are installed. The means of verification shall be agreed upon between the purchaser and the manufacturer. 5 Fu
42、nctional testing 5.1 General Except where otherwise specified, all the tests specified in Clause 5 of IEC 60951-1 shall be carried out. The tests described hereinafter are only additional tests dedicated to the type of monitors within the scope of the present standard. As for tests stated in IEC 609
43、51-1, these tests are to be considered as type tests, although any or all may be considered as acceptance tests by agreement between manufacturer and purchaser. These tests are carried out under standard conditions or with variation of the influence quantities. They are listed in Table 2. 5.2 Enviro
44、nmental performance test 5.2.1 Stability of performances with variation of ambient and stream conditions 5.2.1.1 On-line measurement Stability of performances with variation of ambient temperature or humidity 5.2.1.1.1 Requirements Wherever the equipment or part of the equipment are submitted to var
45、iations of temperature or humidity of the ambient atmosphere, the influence of such variations shall be tested. As the ranges of variation of such influence quantities may be different for testing the measurement assembly and testing the detector, these tests shall be performed in two steps if neces
46、sary: Test of the influence of the temperature or humidity on the measurement assembly. Test of the influence of the temperature or humidity on the detector. The change in indication shall be less than 10 % for each test over the entire ranges of variation of temperature and humidity. Unless otherwi
47、se agreed upon between the manufacturer and the purchaser, the following ranges of variation of temperature and humidity shall apply. 5.2.1.1.2 Test method The measurement assembly (or part of it), if necessary without its shielding, shall be exposed to suitable solid sources as defined in 5.2.5 of
48、IEC 60951-1, such that the nominal reading under standard test conditions is known. The test shall be performed following the method described in the following IEC standards: BS IEC 60951-4:200960951-4 IEC:2009 11 IEC 60068-2-78 for damp heat, steady test, supplemented by the following procedures: t
49、he assemblies are fitted in their reference position, they shall not be subjected to heat radiated by the walls of the test chamber, the assemblies are energised, test duration: 96 h, T = + 40 C, 93 % relative humidity. IEC 60068-2-30 (test Db variant 2) for damp heat cyclic test, supplemented by the following procedures: the assemblies are fitted in their reference position, they shall not be subjected to heat radiated
