BS IEC 60860-2014 Radiation protection instrumentation Warning equipment for criticality accidents《辐射防护仪器 临界事故的警报设备》.pdf

1、BSI Standards PublicationRadiation protection instrumentation Warning equipment for criticality accidentsBS IEC 60860:2014National forewordThis British Standard is the UK implementation of IEC 60860:2014.The UK participation in its preparation was entrusted to TechnicalCommittee NCE/2, Radiation pro

2、tection and measurement.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 ofa contract. Users are responsible for its correct application. The British Standards Institution 2014.P

3、ublished by BSI Standards Limited 2014ISBN 978 0 580 71476 4ICS 13.280Compliance with a British Standard cannot confer immunity fromlegal obligations.This British Standard was published under the authority of theStandards Policy and Strategy Committee on 31 July 2014.Amendments/corrigenda issued sin

4、ce publicationDate Text affectedBRITISH STANDARDBS IEC 60860:2014IEC 60860 Edition 2.0 2014-06 INTERNATIONAL STANDARD NORME INTERNATIONALE Radiation protection instrumentation Warning equipment for criticality accidents Instrumentation pour la radioprotection Equipement de signalisation des accident

5、s de criticit INTERNATIONAL ELECTROTECHNICAL COMMISSION COMMISSION ELECTROTECHNIQUE INTERNATIONALE Q ICS 13.280 PRICE CODE CODE PRIX ISBN 978-2-8322-1638-5 Registered trademark of the International Electrotechnical Commission Marque dpose de la Commission Electrotechnique Internationale Warning! Mak

6、e sure that you obtained this publication from an authorized distributor. Attention! Veuillez vous assurer que vous avez obtenu cette publication via un distributeur agr. BS IEC 60860:2014 2 IEC 60860:2014 IEC 2014 CONTENTS FOREWORD . 4 1 Scope and object . 6 2 Normative references 6 3 Terms and def

7、initions, quantities and units 7 3.1 Terms and definitions 7 3.2 Quantities and units 8 4 General requirements 8 4.1 General characteristics . 8 4.2 Detection criterion . 8 4.3 Safety classification 8 4.4 False alarms . 9 4.5 Failure of components 9 4.6 Ease of decontamination . 9 4.7 Multiple funct

8、ion systems 9 4.8 Interconnection cables and connectors . 9 4.8.1 Interconnecting cables . 9 4.8.2 Connectors 10 4.9 Reliability 10 4.10 Functional testing . 10 4.11 Interchangeability . 10 4.12 Detection subassembly . 10 4.13 Logic unit for signal treatment . 10 4.14 Alarm signals unit . 10 4.14.1

9、Alarm signals . 10 4.14.2 Alarm set point 11 5 General test procedure 11 5.1 Nature of tests 11 5.2 Reference conditions and standard test conditions 11 5.3 Point of test 11 5.4 Reference radiation 12 6 Radiation detection requirements 12 6.1 General . 12 6.2 Energy response . 12 6.2.1 General . 12

10、6.2.2 Gamma detectors 12 6.2.3 Neutron detectors 13 6.3 Response time 13 6.3.1 Requirements 13 6.3.2 Method of test 13 6.4 Alarm threshold of detection . 13 6.4.1 Requirements 13 6.4.2 Method of test 14 6.5 Variation of response with angle of incidence 14 6.5.1 Requirements 14 6.5.2 Method of test 1

11、4 BS IEC 60860:2014IEC 60860:2014 IEC 2014 3 6.6 Overload characteristics . 14 6.6.1 Requirements 14 6.6.2 Method of test 14 7 Environmental requirements 14 7.1 Temperature tests without source or injected electrical signal . 14 7.1.1 Requirements 14 7.1.2 Method of test 14 7.2 Environmental test wi

12、th source or injected electrical signal . 15 7.2.1 Requirements 15 7.2.2 Method of test 15 8 Mechanical requirements . 15 9 Electromagnetic requirements . 15 10 Documentation 15 Bibliography 17 Table 1 Reference and standard test conditions . 11 Table 2 Summary of performance requirements . 16 BS IE

13、C 60860:2014 4 IEC 60860:2014 IEC 2014 INTERNATIONAL ELECTROTECHNICAL COMMISSION _ RADIATION PROTECTION INSTRUMENTATION WARNING EQUIPMENT FOR CRITICALITY ACCIDENTS FOREWORD 1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising all national

14、electrotechnical committees (IEC National Committees). The object of IEC is to promote international co-operation 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 Spe

15、cifications, Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as “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. Intern

16、ational, governmental and non-governmental organizations liaising with the IEC also participate in this preparation. IEC collaborates closely with the International Organization for Standardization (ISO) in accordance with conditions determined by agreement between the two organizations. 2) The form

17、al decisions or agreements of IEC on technical matters express, as nearly as possible, an international consensus 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 fo

18、r international use and are accepted by IEC National Committees in that sense. While all reasonable efforts 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

19、) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications 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 shal

20、l be clearly indicated in the latter. 5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any services carried out by independent certif

21、ication bodies. 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 members of its technical committees and IEC National Committees for any personal inju

22、ry, 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 Publication or any other IEC Publications. 8) Attention is drawn to the Normative references c

23、ited 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 Publication may be the subject of patent rights. IEC shall not be held responsible for identif

24、ying any or all such patent rights. International Standard IEC 60860 has been prepared by subcommittee 45B: Radiation protection instrumentation, of IEC technical committee 45: Nuclear instrumentation. This second edition cancels and replaces the first edition issued in 1987. It constitutes a techni

25、cal revision. The main technical changes with regard to the previous edition are as follows: reference to IEC 61508 concerning the safety classification; introducing requirement for the alarm sound level (90 dBA and 115 dBA at a distance of 1 m from the alarm source); energy response requirement cha

26、nges from (35 %, +35 %) to (35 %, +50 %); time period of 1 min is specified for the overload requirement (1 kGyh1during a period of at least 1 min); updated EMC, mechanical and environmental requirements according to IEC 62706. BS IEC 60860:2014IEC 60860:2014 IEC 2014 5 The text of this standard is

27、based on the following documents: FDIS Report on voting 45B/791/FDIS 45B/794/RVD Full information on the voting for the approval 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. Th

28、e committee has decided that the contents of this publication will remain unchanged until the stability date indicated on the IEC web site under “http:/webstore.iec.ch“ in the data related to the specific publication. At this date, the publication will be reconfirmed, withdrawn, replaced by a revise

29、d edition, or amended. BS IEC 60860:2014 6 IEC 60860:2014 IEC 2014 RADIATION PROTECTION INSTRUMENTATION WARNING EQUIPMENT FOR CRITICALITY ACCIDENTS 1 Scope and object This International Standard applies to equipment intended to provide warning of a criticality accident by the detection of gamma radi

30、ation, neutrons or both from such an event. This standard is primarily intended to apply to equipment design and, therefore, does not address the need for placement of such equipment. The need for criticality alarm systems and the utilisation procedures are described in ISO 7753 and ISO 11320. The p

31、rimary purpose of the criticality alarm system is to detect radiation from criticality accidents and warn personnel. Suitable alarms shall be provided so that personnel present in the area involved and in adjacent effected areas (often the complete facility) can be warned in the event of a criticali

32、ty accident occurring. These alarms are intended to activate an evacuation alarm to reduce the probability of serious exposure to personnel. Such systems may also have secondary functions, such as providing a follow-up measurement of the radiation level during the accident. The systems should only b

33、e used for these secondary functions, provided that the secondary functions have no adverse effect on the criticality alarms and their essential characteristics (for example, reliability) described in this standard. The object of this standard is to prescribe general, radiation detection, environmen

34、tal, mechanical, electromagnetic and documentation requirements and to specify acceptance criteria for criticality accident warning equipment. This standard is not applicable to photon or neutron dose equivalent (rate) meters or monitors covered by IEC 60532, IEC 60846 (all parts), IEC 61017 (all pa

35、rts), and IEC 61005. This standard is not applicable either to equipment or assemblies used in control and safety systems of nuclear reactors. 2 Normative references The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. F

36、or dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. IEC 60050 (all parts): International Electrotechnical Vocabulary (available at http:/www.electropedia.org) IEC 61508 (all parts), Functional

37、safety of electrical/electronic/programmable electronic safety-related systems IEC 62706, Radiation protection instrumentation Environmental, electromagnetic and mechanical performance requirements ISO 7753:1987, Nuclear energy Performance and testing requirements for criticality detection and alarm

38、 systems BS IEC 60860:2014IEC 60860:2014 IEC 2014 7 International Bureau of Weights and Measures: The International System of Units, 8th edition, 2006 3 Terms and definitions, quantities and units 3.1 Terms and definitions For the purposes of this document, the following terms and definitions, as we

39、ll as those given in IEC 60050-395 apply. 3.1.1 acceptance test contractual test to prove to the customer that the device fulfils certain specifications 3.1.2 alarm method for notification of a criticality accident 3.1.3 alarm set point minimum radiation dose and/or dose rate that will activate the

40、alarm 3.1.4 conventional quantity value (dose) quantity value attributed by agreement to a quantity for a given purpose Note 1 to entry: The term “conventional true quantity value” is sometimes used for this concept, but its use is discouraged. Note 2 to entry: Sometimes a conventional quantity valu

41、e is an estimate of a true quantity value. Note 3 to entry: A conventional quantity value is generally accepted as being associated with a suitably small measurement uncertainty, which might be zero. Note 4 to entry: In this standard the quantity is the dose. SOURCE: VIM:2007, 2.12 3.1.5 criticality

42、 accident release of energy as a result of an accidentally produced self-sustained or divergent neutron chain reaction 3.1.6 criticality alarm system all parts of the assembly, subassemblies, functional units and components that together make a workable system, including all circuitry, alarms, conne

43、ctions, cables, detectors, and auxiliary subassemblies. The criticality alarm system comprises at least the following subassemblies: detection subassembly, including associated electronics; warning subassembly including the logic unit and alarm unit 3.1.7 false alarm activation of the alarm signal i

44、n the absence of a criticality accident 3.1.8 type test conformity test made on one or more items representative of the production BS IEC 60860:2014 8 IEC 60860:2014 IEC 2014 3.2 Quantities and units In the present standard, units of the International System (SI) are used1. The definitions of radiat

45、ion quantities are given in IEC 60050-395. The corresponding old units (non-SI) are indicated in brackets. Nevertheless, the following units may also be used: for energy: electron-volt (symbol: eV), 1 eV = 1,602 1019J; for time: hour (symbol: h) or minute (symbol: min). 4 General requirements 4.1 Ge

46、neral characteristics Criticality alarm systems are designed for the automatic and prompt detection of gamma radiation or neutrons from a criticality accident and to actuate immediate evacuation and warning alarms. The primary functions of the criticality alarm system shall be to: detect a criticali

47、ty accident as soon as it occurs within the monitoring zone of the detector(s); actuate an alarm with minimal delay; achieve a high degree of reliability required by its safety classification and low probability of false alarm; fail safe by design and reveal failures (single failure shall be indicat

48、ed but shall not disable the system and result in a potential non-detection of a criticality accident); be secured against unauthorised adjustment. Secondary functions of the criticality alarm system should be established by agreement between the manufacturer and user. A recommended secondary functi

49、on should include the ability to measure radiation levels during and following a criticality accident. It shall be possible to test the response and performance of the criticality alarm system without causing personnel evacuation. 4.2 Detection criterion The following detection criterion definition described in ISO 7753 is used. Criticality alarm systems shall be designed to detect promptly the minimum accident of concern. For this purpose, in typical unshielded