IEC 62598-2011 Nuclear instrumentation - Constructional requirements and classification of radiometric gauges《核子检测仪表.放射性测量计的分类和构造要求》.pdf

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1、 IEC 62598 Edition 1.0 2011-03 INTERNATIONAL STANDARD Nuclear instrumentation Constructional requirements and classification of radiometric gauges IEC 62598:2011(E) THIS PUBLICATION IS COPYRIGHT PROTECTED Copyright 2011 IEC, Geneva, Switzerland All rights reserved. Unless otherwise specified, no par

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4、International Electrotechnical Commission (IEC) is the leading global organization that prepares and publishes International Standards for all electrical, electronic and related technologies. About IEC publications The technical content of IEC publications is kept under constant review by the IEC. P

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6、tion on projects, withdrawn and replaced publications. IEC Just Published: www.iec.ch/online_news/justpub Stay up to date on all new IEC publications. Just Published details twice a month all new publications released. Available on-line and also by email. Electropedia: www.electropedia.org The world

7、s leading online dictionary of electronic and electrical terms containing more than 20 000 terms and definitions in English and French, with equivalent terms in additional languages. Also known as the International Electrotechnical Vocabulary online. Customer Service Centre: www.iec.ch/webstore/cust

8、serv If you wish to give us your feedback on this publication or need further assistance, please visit the Customer Service Centre FAQ or contact us: Email: csciec.ch Tel.: +41 22 919 02 11 Fax: +41 22 919 03 00 IEC 62598 Edition 1.0 2011-03 INTERNATIONAL STANDARD Nuclear instrumentation Constructio

9、nal requirements and classification of radiometric gauges INTERNATIONAL ELECTROTECHNICAL COMMISSION T ICS 27.120 PRICE CODE ISBN 978-2-88912-421-3 Registered trademark of the International Electrotechnical Commission 2 62598 IEC:2011(E) CONTENTS FOREWORD . 4 INTRODUCTION . 6 1 Scope and object 7 2 N

10、ormative references . 7 3 Terms and definitions . 8 4 Classification of radiometric gauge types 9 4.1 Category A: Radiometric gauges with restricted beam . 9 4.2 Category B: Radiometric gauges with omnidirectional beam 11 4.3 Category C: Stand alone source housings for fixed radiometric gauges . 11

11、4.4 Dose rate classes 12 4.5 Temperature class . 12 5 General requirements . 13 5.1 Measuring gap 13 5.2 Source holder 13 5.3 Source housing . 13 5.4 Alignment of the useful beam 13 5.5 Other requirements . 13 6 Protection against ionizing radiation . 14 6.1 General requirements 14 6.2 Requirements

12、for Category A gauges 14 6.3 Requirements for Category B gauges 14 6.4 Requirements for Category C stand alone source housings . 14 6.5 Resistance of the source housing in case of fire 15 6.6 Detector housing . 15 6.7 Measuring head . 15 7 Other safety devices . 15 7.1 General . 15 7.2 Protection ag

13、ainst non-authorized use . 15 7.3 Indication of the shutter position 16 7.4 Additional warning device 16 8 Determination of the dose equivalent rate . 16 8.1 General . 16 8.2 Dose equivalent rate measurements in the case of closed shutters . 18 8.3 Dose equivalent rate measurements in the case of op

14、en shutters 18 8.4 Procedure for dose equivalent rate measurements 18 8.5 Determining the relevant values of the dose equivalent rate 19 9 Test methods . 19 9.1 General . 19 9.2 Temperature cycle test on the shutters and the source holder . 19 9.2.1 Requirements 19 9.2.2 Procedure 19 9.3 Test for ch

15、ecking the resistance of the shutter, the source holder and the source container in case of fire 20 9.3.1 Requirements 20 9.3.2 Procedure 20 62598 IEC:2011(E) 3 9.4 Test for checking the mechanical resistance of the shutter and the source holder 20 9.4.1 Requirements 20 9.4.2 Procedure 21 10 System

16、classification coding and labelling 21 10.1 Classification code 21 10.2 Labelling . 22 11 Accompanying documents 22 Annex A (informative) Guidelines for the installation of radiometric gauges 23 Figure 1 Schematic arrangement of Category A gauges . 10 Figure 2 Schematic arrangement of Category B gau

17、ges . 11 Figure 3 Category C stand alone source housing for fixed level or density gauges . 11 Figure 4 Schematic representation of isodistance gauging faces in the case of thickness gauges 17 Figure 5 Schematic representation of isodistance gauging faces in the case of level and density gauges and

18、back-scatter gauges 17 Figure 6 Schematic representation of isodistance gauging faces in the case of stand alone source housings 18 Figure A.1 Examples of protection methods and principles . 24 Table 1 Dose rate classes 12 Table 2 Temperature classes . 12 Table 3 Fire resistance classes 15 4 62598 I

19、EC:2011(E) INTERNATIONAL ELECTROTECHNICAL COMMISSION _ NUCLEAR INSTRUMENTATION CONSTRUCTIONAL REQUIREMENTS AND CLASSIFICATION OF RADIOMETRIC GAUGES FOREWORD 1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising all national electrotechnical

20、 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 Specifications, Tec

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22、ental 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 formal decisions or

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27、 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 injury, property da

28、mage 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 cited in this pu

29、blication. 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 identifying any or all

30、 such patent rights. International Standard IEC 62598 has been prepared by IEC technical committee 45: Nuclear instrumentation. This standard cancels and replaces the second edition of IEC 60405, issued in 2003. It constitutes a technical revision (see Introduction). The text of this standard is bas

31、ed on the following documents: FDIS Report on voting 45/718/FDIS 45/721/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. 62598 I

32、EC:2011(E) 5 The 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, repla

33、ced by a revised edition, or amended. A bilingual version of this publication may be issued at a later date. 6 62598 IEC:2011(E) INTRODUCTION This International Standard is based on the second edition of IEC 60405 which was published in 2003. It modifies or supplements it with additional provisions,

34、 where required by current needs. Compared to the second edition of IEC 60405, the following major changes have been made: Introduction of Category C for stand alone source housings intended for fixed radiometric gauges and associated test procedures. The system classification code has been amended

35、by one digit indicating the applied revision of IEC 62598 and by a second digit indicating the fire test conditions. The term dose rate class shall be used instead of radiation protection class. Class 7, or alternatively E, represents the current ICRP regulations. Introduction of fire resistance cla

36、sses. Revision of the procedure for dose equivalent measurements. Addition of Annex A (informative) “Guidelines for the installation of radiometric gauges“. 62598 IEC:2011(E) 7 NUCLEAR INSTRUMENTATION CONSTRUCTIONAL REQUIREMENTS AND CLASSIFICATION OF RADIOMETRIC GAUGES 1 Scope and object This Intern

37、ational Standard applies to the manufacture and installation of electrical measuring systems and instruments utilizing radioactive sources (radiometric gauges, hereinafter called gauges). It also applies to source housings intended for use in the aforementioned measuring systems. This standard appli

38、es to equipment, which is not related to power production or to the fuel cycle. It does not apply to portable gauges which, because of their construction and purposes for use, are intended to be operated as mobile equipment and it does not apply to gauges operated with X-ray tubes, but it can be ana

39、logously applicable to these gauges. The object of this standard is to specify constructional requirements for the design of instruments utilizing radioactive sources in regard of radiation protection. This standard does not take into account mechanical or electrical hazards. 2 Normative references

40、The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. IEC 60050-394:2007, International Electrotechnica

41、l Vocabulary (IEV) Part 394: Nuclear instrumentation Instruments, systems, equipment and detectors IEC 60476:1993, Nuclear instrumentation Electrical measuring systems and instruments utilizing ionizing radiation sources General aspects IEC 60692:1999, Nuclear instrumentation Density gauges utilizin

42、g ionizing radiation Definitions and test methods IEC 60846-1:2009, Radiation protection instrumentation Ambient and/or directional dose equivalent (rate) meters and/or monitors for beta, X and gamma radiation Part 1: Portable workplace and environmental meters and monitors IEC 60846-2:2007, Radiati

43、on protection instrumentation Ambient and/or directional dose equivalent (rate) meters and/or monitors for beta, X and gamma radiation Part 2: High range beta and photon dose and dose rate portable instruments for emergency radiation protection purposes IEC 60982:1989, Level measuring systems utiliz

44、ing ionizing radiation with continuous or switching output IEC 61005:2003, Radiation protection instrumentation Neutron ambient dose equivalent (rate) meters IEC 61010-1:2010, Safety requirements for electrical equipment for measurement, control and laboratory use Part 1: General requirements 8 6259

45、8 IEC:2011(E) IEC 61326 (all parts), Electrical equipment for measurement, control and laboratory use EMC requirements IEC 61336:1996, Nuclear instrumentation Thickness measurement systems utilizing ionizing radiation Definitions and test methods ISO 361:1975, Basic ionizing radiation symbol ISO 921

46、:1997, Nuclear energy Vocabulary ISO 2919:1999, Radiation protection Sealed radioactive sources General requirements and classification 3 Terms and definitions For the purposes of this document, the terms and definitions as specified in ISO 921, IEC 60050-394 and IEC 60476, as well as the following

47、apply. 3.1 collimation device device for restricting the radiation in one or more directions 3.2 detector housing that portion of the measuring head that includes the detector NOTE This assembly may be incorporated with the source housing, especially in the case of a back-scatter measurement system.

48、 3.3 measuring head subassembly comprising one or several radioactive sources and detectors along with compensation sensors, if necessary, and devices that can be used to measure and correct the effects of undesirable influences NOTE The measuring head may consist of separate source-housing and dete

49、ctor-housing subassemblies and it may include electronic devices for signal processing. 3.4 permanently installed radiometric gauge radiometric gauge that is permanently installed at the measuring location NOTE The measuring location may also be situated on mobile equipment (e.g., on a ship or a vehicle). The detector housing and the source housing may be installed both rigidly fixed and movable. The mobility of the system is limited an