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
2、t of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from either IEC or IECs member National Committee in the country of the requester. If you have any questions about IEC copyri
3、ght or have an enquiry about obtaining additional rights to this publication, please contact the address below or your local IEC member National Committee for further information. IEC Central Office 3, rue de Varemb CH-1211 Geneva 20 Switzerland Email: inmailiec.ch Web: www.iec.ch About the IEC The
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
5、lease make sure that you have the latest edition, a corrigenda or an amendment might have been published. Catalogue of IEC publications: www.iec.ch/searchpub The IEC on-line Catalogue enables you to search by a variety of criteria (reference number, text, technical committee,). It also gives informa
6、tion on projects, withdrawn and replaced publications.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
21、hnical 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. International, governm
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
23、 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 for international
24、 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) In order to p
25、romote 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 shall be clearly in
26、dicated 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 certification bodies.
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
