1、BSI Standards PublicationWB11885_BSI_StandardCovs_2013_AW.indd 1 15/05/2013 15:06Radiation protection instrumentation - Radon and radon decay product measuring instrumentsPart 2: Specific requirements for 222Rn and 220Rn measuring instrumentsBS EN 61577-2:2017EUROPEAN STANDARD NORME EUROPENNE EUROPI
2、SCHE NORM EN 61577-2 August 2017 ICS 13.280 English Version Radiation protection instrumentation - Radon and radon decay product measuring instruments - Part 2: Specific requirements for 222Rn and 220Rn measuring instruments (IEC 61577-2:2014 , modified) Instrumentation pour la radioprotection - Ins
3、truments de mesure du radon et des descendants du radon - Partie 2: Exigences spcifiques pour les instruments de mesure du 222Rn et du 220Rn (IEC 61577-2:2014 , modifie) Strahlenschutz-Messgerte - Gerte fr die Messung von Radon und Radon-Folgeprodukten - Teil 2: Besondere Anforderungen fr Messgerte
4、fr Rn-222 und Rn-220 (IEC 61577-2:2014 , modifiziert) This European Standard was approved by CENELEC on 2017-06-16. CENELEC members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without
5、 any alteration.Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CENELEC member. This European Standard exists in three official versions (English, French, German). A version in any other
6、language made by translation under the responsibility of a CENELEC member into its own language and notified to the CEN-CENELEC Management Centre has the same status as the official versions. CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus,
7、 the Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey a
8、nd the United Kingdom. European Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels 2017 CENELEC All rights of exploitation in any form and by
9、any means reserved worldwide for CENELEC Members. Ref. No. EN 61577-2:2017 ENational forewordThis British Standard is the UK implementation of EN 61577-2:2017. It is derived from IEC 61577-2:2014. It supersedes BS IEC 61577-2:2014, which is withdrawn.The CENELEC common modifications to this document
10、 have been provided in their entirety in the European Endorsement Notice. BSIs policy of providing consolidated content remains unchanged; however, in the interest of expediency, in this instance BSI have chosen to collate the relevant content at the beginning of this document.The UK participation i
11、n its preparation was entrusted to Technical Committee NCE/2, Radiation protection and measurement.A list of organizations represented on this committee can be obtained on request to its secretary.This publication does not purport to include all the necessary provisions of a contract. Users are resp
12、onsible for its correct application. The British Standards Institution 2018 Published by BSI Standards Limited 2018ISBN 978 0 580 97608 7ICS 13.280; 17.240Compliance with a British Standard cannot confer immunity from legal obligations.This British Standard was published under the authority of the S
13、tandards Policy and Strategy Committee on 31 July 2014.Amendments/corrigenda issued since publicationDate Text affected31 March 2018 This corrigendum renumbers BS IEC 61577-2:2014 as BS EN 61577-2:2017BRITISH STANDARDBS EN 61577-2:2017EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 61577-2 Augu
14、st 2017 ICS 13.280 English Version Radiation protection instrumentation - Radon and radon decay product measuring instruments - Part 2: Specific requirements for 222Rn and 220Rn measuring instruments (IEC 61577-2:2014 , modified) Instrumentation pour la radioprotection - Instruments de mesure du rad
15、on et des descendants du radon - Partie 2: Exigences spcifiques pour les instruments de mesure du 222Rn et du 220Rn (IEC 61577-2:2014 , modifie) Strahlenschutz-Messgerte - Gerte fr die Messung von Radon und Radon-Folgeprodukten - Teil 2: Besondere Anforderungen fr Messgerte fr Rn-222 und Rn-220 (IEC
16、 61577-2:2014 , modifiziert) This European Standard was approved by CENELEC on 2017-06-16. CENELEC members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration.Up-to-dat
17、e lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CENELEC member. This European Standard exists in three official versions (English, French, German). A version in any other language made by translat
18、ion under the responsibility of a CENELEC member into its own language and notified to the CEN-CENELEC Management Centre has the same status as the official versions. CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic, Denm
19、ark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. Eu
20、ropean Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels 2017 CENELEC All rights of exploitation in any form and by any means reserved worldw
21、ide for CENELEC Members. Ref. No. EN 61577-2:2017 EBS EN 61577-2:2017EN 61577-2:2017 (E) 2 European foreword This document (EN 61577-2:2017) consists of the text of IEC 61577-2:2014 prepared by IEC/SC 45B “Radiation protection instrumentation“ of IEC/TC 45 “Nuclear instrumentation“, together with th
22、e common modifications prepared by CLC/TC 45B “Radiation protection instrumentation“. The following dates are fixed: latest date by which this document has to be implemented at national level by publication of an identical national standard or by endorsement (dop) 2018-06-16 latest date by which the
23、 national standards conflicting with this document have to be withdrawn (dow) 2020-06-16 Clauses, subclauses, notes, tables, figures and annexes which are additional to those in IEC 61577-2:2014 are prefixed “Z”. This document has been prepared under a mandate given to CENELEC by the European Commis
24、sion and the European Free Trade Association. Endorsement notice The text of the International Standard IEC 61577-2:2014 was approved by CENELEC as a European Standard with agreed common modifications. BS EN 61577-2:2017EN 61577-2:2017 (E) 3 COMMON MODIFICATIONS Table 1 Reference conditions and stan
25、dard test conditions (unless otherwise indicated by the manufacturer) In the line “Ambient temperature” replace “22 C” with “24 C”. In the line “Relative humidity” replace “50 %” with “40 %. In the line “Ambient dose equivalent” replace “R0, the equation simplifies to BS EN 61577-2:2017IEC 61577-2:2
26、014 IEC 2014 17 bbRad1RtV =. 7.5 Response time 7.5.1 Requirements The manufacturer shall specify the response time of the assembly. NOTE This test is not relevant for instruments based on grab sampling or other short-term sampling methods. 7.5.2 Test method The test shall be executed in a radon refe
27、rence atmosphere established in a STAR under standard test conditions. When the activity concentration of 222Rn/220Rn is constant, the instrument shall be suddenly exposed to the test quantity established inside the STAR in order to achieve a step change. The duration between the instant of a step c
28、hange and the instant when the output signal reaches for the first time 90 % of its final value shall be measured and given as response time. NOTE A step change in the test quantity can be achieved by putting the instrument, which is already in operation, into the test atmosphere, or by turning on t
29、he sampling unit. 7.6 Signal accumulation 7.6.1 Requirements An integrating instrument shall be capable of accumulating and summing consecutive or simultaneous effects and storing the measured values permanently or for at least the duration of measurement. The integration can be performed electronic
30、ally by the signal processing system or passively by a measuring sensor that can accumulate the signals. The integrated value indicated by the instrument related to the conventionally true integrated value shall lie within the nominal tolerances given by the manufacturer. 7.6.2 Test method The test
31、shall be executed in a radon reference atmosphere established in a STAR under standard test conditions. The standard test conditions shall be kept constant during the test. The time period of accumulation and integration shall be agreed upon between the manufacturer and the purchaser. 8 Requirements
32、 and tests concerning air circuit performance 8.1 General These tests shall be applied to all instruments where the response depends on a known flow-rate through the sampling and detection assemblies (see Table 3). When it is demonstrated that one or more tests are not needed to assess the conformit
33、y with performance requirements, those tests can be excluded. The decision on exclusion of tests shall be agreed upon between the manufacturer and the purchaser. BS EN 61577-2:2017 18 IEC 61577-2:2014 IEC 2014 8.2 Flow-rate stability 8.2.1 Requirements The manufacturer shall specify the air flow-rat
34、e when the airflow system is used. After the warm-up time of the instrument, the relative error of the sampling flow-rate shall not vary by more than 10 % for the subsequent 20 h of operation. 8.2.2 Test method The test shall be carried out with dust-free air in order to avoid any variation of the p
35、ressure drop of the sampling device during the test. An air flow meter calibrated under measuring conditions shall be incorporated in the air circuit in order to measure the flow-rate after 30 min, 5 h and 20 h of operation. 8.3 Accuracy of the air flow-rate measurement 8.3.1 Requirements The manufa
36、cturer shall specify the accuracy of the flow-rate measurement of the air. The relative error of the flow-rate measurement shall not be more than 10 %. 8.3.2 Test method A flow-rate measurement device calibrated under measuring conditions shall be incorporated in the air circuit. Filtered, dust-free
37、 air shall flow through the air circuit under standard operating conditions of the instrument. The relative error of the air flow-rate measured after 30 min with respect to the air flow-rate specified by the manufacturer is to be calculated. 8.4 Effect of filter pressure drop 8.4.1 Requirements An i
38、ncreasing pressure drop of 10 % from the nominal pressure drop shall not cause a relative error regarding the indication of the instrument of more than 10 % under standard test conditions. The relative error shall be determined referring to a relevant radiation quantity indicated by the instrument.
39、8.4.2 Test method In order to identify the effect on the whole measurement chain, the test shall be executed in a radon reference atmosphere established in a STAR under standard test conditions. The standard test conditions shall be kept constant during the test. The test quantity shall induce an in
40、dication within the rated range. Before starting the test, the instrument is to be fitted with a clean sampling filter. A valve shall be inserted downstream to the air inlet. A calibrated pressure sensor relative to the atmospheric pressure shall be fitted to measure the pressure drop across the air
41、 inlet and the valve. EXAMPLE A U-tube or a differential manometer can be used as a pressure sensor. The pressure drop through the filter shall be measured by the pressure sensor; the indication of the instrument shall be registered. Then the valve shall be adjusted to yield a pressure drop across t
42、he filter of 10 % above the nominal pressure drop. The indication of the instrument at this pressure drop is to be registered and the relative error regarding the indication at nominal pressure drop is to be determined. BS EN 61577-2:2017IEC 61577-2:2014 IEC 2014 19 8.5 Indication of low sampling fl
43、ow-rate 8.5.1 Requirements The system shall indicate an alarm when the indication of the sampling flow-rate goes below an acceptable level. 8.5.2 Test method The system shall operate normally at the beginning of the test. The air sampling flow-rate shall be reduced to a level below the preset air sa
44、mpling flow-rate alarm level. An alarm level shall be activated. 9 Requirements and tests concerning environmental performance 9.1 Response to ambient gamma radiation 9.1.1 Requirements The instrument shall be designed in such a way that the influence of external gamma radiation on the measurement r
45、esult is minimized. The manufacturer shall state the differential change of indicated value caused by an ambient dose equivalent rate of 1 Svh1in relation to the indicated value at the lowest and highest limit of the rated range under standard test conditions. 9.1.2 Test method The gamma radiation t
46、est field shall be produced by a 137Cs source. At the reference point, the test field shall have an ambient dose equivalent rate of (1,0 0,1) Svh1uniform over a plane area of greater than the detector. The source shall be placed at a distance to achieve this. The ambient dose equivalent rate of the
47、external gamma radiation at the reference point shall be measured by a calibrated dose rate meter. During the test, the instrument to be tested shall be positioned with the detector at the reference point. 9.2 Ambient temperature 9.2.1 Requirements Over the ranges of temperature specified in Table 4
48、, the relative error shall remain within the limits specified in that table. 9.2.2 Test method This test shall be executed in a radon reference atmosphere established in a STAR under standard test conditions for environmental characteristics except ambient temperature. The measurement shall begin af
49、ter a thermal steady state has been reached and should last for a duration depending on the instrument characteristics. The temperature shall be maintained at each of its extreme values for at least 1 h, and the indication of the instrument measured during the last 30 min of this period shall be compared with the corresponding reading under standard test conditions. BS EN 61577-2:2017 20 IEC 61577-2:2014 IEC 2014 9.3 Relative humidity and condensed moisture 9.3.1 Requirements The relative error regarding the indication
