Radiation protection instrumentation - Installed ambient dose equivalent rate meters, warning and monitoring assemblies for neutrons with energies from thermal to 20 MeV

IEC 61322:2020 applies to installed dose equivalent rate meters, warning assemblies and monitors, as defined below. It covers equipment intended to measure neutron radiation in dose equivalent rates in the energy region between thermal and 20 MeV for the purposes of radiation protection.
Assemblies of this type are commonly defined as area radiation monitors. They are normally employed to determine continuously the radiological situation in working areas in which the radiation field may change with time, for example, nuclear power plants, particle accelerators, high-activity laboratories, fuel reprocessing plants, etc., and provide alarms when the radiation field goes outside predetermined limits.
The assemblies considered in this document comprise at least:
a detector assembly, which may, for example, consist of a detector probe (for thermal neutrons such as BF3 proportional counter, 3He proportional counter, 6LiI(Tl) scintillation detector, etc.) and a moderating and absorbing medium surrounding the detector;
a processing assembly, which may be fitted into a centralized panel, which, in the case of warning assemblies and monitors, provides signal outputs and contacts capable of activating alarm or other trip circuits;
alternatively, the case when all the processing electronics are placed within the detection unit (so called "smart blocks") may be considered. In this case the functions of the processing assembly will be composed of only the indication, the providing signal outputs and contacts.  
This second edition cancels and replaces the first edition published in 1994This edition includes the following significant technical changes with respect to the previous edition:
this document has been updated to take account of the requirements of the relevant IEC standards, IEC 60532:2010 and IEC 61005:2014.

Instrumentation pour la radioprotection - Débitmètres d'équivalent de dose ambiant, ensembles d'alarmes et moniteurs à poste fixe pour des énergies de neutrons comprises entre l'énergie thermique et 20 MeV

l'IEC 61322:2020 s'applique aux débitmètres d'équivalent de dose, aux ensembles d'alarmes et aux moniteurs à poste fixe, comme défini ci-dessous. Il couvre les équipements destinés à mesurer les rayonnements neutroniques dans les débits d'équivalent de dose dont la région d'énergie est comprise entre l'énergie thermique et 20 MeV pour les besoins de la radioprotection.
Les ensembles de ce type sont généralement définis comme des moniteurs de rayonnements de zone. Ils sont normalement utilisés pour déterminer en continu la situation radiologique des zones de travail dans lesquelles le champ de rayonnement peut varier au fil du temps (par exemple les centrales nucléaires, les accélérateurs de particules, les laboratoires à haute activité de rayonnement, les usines de retraitement de combustible, etc.) et pour déclencher des alarmes lorsque le champ de rayonnement sort des limites prédéterminées.
Les ensembles couverts par le présent document comprennent au moins:
un ensemble de détection, qui peut comprendre par exemple un détecteur de neutrons thermiques (par exemple, un compteur proportionnel BF3, un compteur proportionnel 3He, un détecteur à scintillation 6LiI(Tl), etc.) et un matériau modérateur et absorbant enveloppant le détecteur;
un ensemble de traitement, pouvant être placé dans un bâtiment central, qui, dans le cas des ensembles d'alarmes et des moniteurs, fournit des signaux de sortie et des contacts capables d'activer une alarme ou d'autres circuits de déclenchement;
sinon, le cas où tous les composants électroniques de traitement sont placés à l'intérieur de l'unité de détection ("blocs intelligents") peut être envisagé. Dans ce cas, les fonctions de l'ensemble de traitement ne comprennent que l'indication, les signaux de sortie et les contacts.  
Cette deuxième édition annule et remplace la première édition parue en 1994. Cette édition inclut les modifications techniques majeures suivantes par rapport à l'édition précédente:
le présent document a été mis à jour afin d'intégrer les exigences des normes IEC pertinentes: l'IEC 60532:2010 et l'IEC 61005:2014.

General Information

Status
Published
Publication Date
09-Jan-2020
Current Stage
PPUB - Publication issued
Completion Date
10-Jan-2020
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IEC 61322:2020 - Radiation protection instrumentation - Installed ambient dose equivalent rate meters, warning and monitoring assemblies for neutrons with energies from thermal to 20 MeV
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IEC 61322
Edition 2.0 2020-01
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Radiation protection instrumentation – Installed ambient dose equivalent rate
meters, warning and monitoring assemblies for neutrons with energies from
thermal to 20 MeV
Instrumentation pour la radioprotection – Débitmètres d'équivalent de dose
ambiant, ensembles d'alarmes et moniteurs à poste fixe pour des énergies de
neutrons comprises entre l'énergie thermique et 20 MeV
IEC 61322:2020-01(en-fr)
---------------------- Page: 1 ----------------------
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---------------------- Page: 2 ----------------------
IEC 61322
Edition 2.0 2020-01
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Radiation protection instrumentation – Installed ambient dose equivalent rate
meters, warning and monitoring assemblies for neutrons with energies from
thermal to 20 MeV
Instrumentation pour la radioprotection – Débitmètres d'équivalent de dose
ambiant, ensembles d'alarmes et moniteurs à poste fixe pour des énergies de
neutrons comprises entre l'énergie thermique et 20 MeV
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 13.280; 17.240 ISBN 978-2-8322-7635-8

Warning! Make sure that you obtained this publication from an authorized distributor.

Attention! Veuillez vous assurer que vous avez obtenu cette publication via un distributeur agréé.

® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale
---------------------- Page: 3 ----------------------
– 2 – IEC 61322:2019  IEC 2019
CONTENTS

FOREWORD ........................................................................................................................... 6

1 Scope .............................................................................................................................. 8

2 Normative references ...................................................................................................... 9

3 Terms and definitions, abbreviated terms and symbols, quantities and units .................. 10

3.1 Terms and definitions ............................................................................................ 10

3.2 Abbreviated terms and symbols ............................................................................ 17

3.3 Quantities and units .............................................................................................. 18

4 Design requirements ...................................................................................................... 18

4.1 Construction and performance .............................................................................. 18

4.1.1 General ......................................................................................................... 18

4.1.2 Equipment configuration ................................................................................ 18

4.1.3 Equipment reliability ...................................................................................... 19

4.2 Indication facilities ................................................................................................ 19

4.3 Alarm facilities ...................................................................................................... 19

4.3.1 General ......................................................................................................... 19

4.3.2 High level alarms ........................................................................................... 20

4.3.3 Low level alarms ............................................................................................ 20

4.3.4 Instrument fault alarms .................................................................................. 20

4.4 External facilities .................................................................................................. 20

4.5 Effective range of measurement ............................................................................ 20

4.5.1 General ......................................................................................................... 20

4.5.2 Requirements ................................................................................................ 21

4.5.3 Interrelationship between response time and statistical fluctuations ............... 21

4.5.4 Rated range of an influence quantity.............................................................. 21

4.5.5 Minimum rated range of influence quantity ..................................................... 22

4.6 Ingress protection (IP) classification ..................................................................... 22

4.7 Assembly labels and markings .............................................................................. 22

4.8 Functional safety .................................................................................................. 22

5 General test procedure .................................................................................................. 22

5.1 Test requirements ................................................................................................. 22

5.2 Tests performed with variation of influence quantities ........................................... 23

5.2.1 General ......................................................................................................... 23

5.2.2 Tests for influence quantities of type F .......................................................... 25

5.2.3 Tests for influence quantities of type S .......................................................... 25

5.3 Point of test .......................................................................................................... 25

5.4 Statistical fluctuations ........................................................................................... 25

5.5 Radiation sources ................................................................................................. 26

5.6 Work place neutron fields...................................................................................... 26

5.7 Consideration of several detectors or signals in a dose rate meter ........................ 26

5.8 Functionality test ................................................................................................... 27

5.8.1 General ......................................................................................................... 27

5.8.2 Pre-test (preparation) .................................................................................... 27

5.8.3 Post-test ........................................................................................................ 27

6 Radiation detection requirements .................................................................................. 28

6.1 General ................................................................................................................. 28

---------------------- Page: 4 ----------------------
IEC 61322:2019  IEC 2019 – 3 –

6.2 Consideration of the uncertainty of the conventional true value ............................. 28

6.3 Linearity of dose rate response ............................................................................. 28

6.3.1 Requirements ................................................................................................ 28

6.3.2 Tests to be performed .................................................................................... 28

6.3.3 Type tests ...................................................................................................... 28

6.3.4 Routine tests ................................................................................................. 29

6.3.5 Test method using sources ............................................................................ 29

6.3.6 Interpretation of the results of the test using sources ..................................... 29

6.3.7 Test procedure with variation of the calibration distance ................................ 29

6.3.8 Interpretation of the results of the test with variation of the calibration

distance ......................................................................................................... 29

6.3.9 Equivalent electrical test method ................................................................... 30

6.3.10 Interpretation of the equivalent electrical test result ....................................... 30

6.4 Variation of the response due to neutron energy ................................................... 30

6.4.1 General ......................................................................................................... 30

6.4.2 Requirements ................................................................................................ 30

6.4.3 Method of test................................................................................................ 31

6.4.4 Interpretation of the results ............................................................................ 32

6.5 Variation of response with angle of incidence........................................................ 32

6.5.1 General ......................................................................................................... 32

6.5.2 Requirements ................................................................................................ 32

6.5.3 Method of test................................................................................................ 34

6.5.4 Interpretation of the results of the test ........................................................... 35

6.6 Response to other external ionizing radiations ...................................................... 35

6.6.1 Alpha and beta radiations .............................................................................. 35

6.6.2 Photon radiation ............................................................................................ 35

6.7 Overload characteristics ....................................................................................... 36

6.7.1 Requirements ................................................................................................ 36

6.7.2 Method of test................................................................................................ 36

6.8 Statistical fluctuations ........................................................................................... 37

6.8.1 Requirements ................................................................................................ 37

6.8.2 Method of test................................................................................................ 37

6.8.3 Interpretation of the results ............................................................................ 37

6.9 Response time ...................................................................................................... 37

6.9.1 Requirements ................................................................................................ 37

6.9.2 Method of test................................................................................................ 38

6.10 Zero drift ............................................................................................................... 38

6.10.1 Requirements ................................................................................................ 38

6.10.2 Method of test................................................................................................ 38

6.11 Alarm requirements ............................................................................................... 38

6.11.1 Requirements ................................................................................................ 38

6.11.2 Method of test................................................................................................ 39

6.12 Equipment failure alarms ...................................................................................... 39

6.12.1 Requirements ................................................................................................ 39

6.12.2 Method of test................................................................................................ 39

6.13 False alarm test .................................................................................................... 39

6.13.1 Requirements ................................................................................................ 39

6.13.2 Method of test................................................................................................ 39

6.14 Alarm response time and stability ......................................................................... 39

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– 4 – IEC 61322:2019  IEC 2019

6.14.1 Requirements ................................................................................................ 39

6.14.2 Method of test................................................................................................ 39

6.15 Warm-up ............................................................................................................... 40

6.15.1 Requirements ................................................................................................ 40

6.15.2 Method of test................................................................................................ 40

6.16 Power supplies ..................................................................................................... 41

6.16.1 Requirements ................................................................................................ 41

6.16.2 Method of test................................................................................................ 41

7 Environmental requirements .......................................................................................... 41

7.1 General ................................................................................................................. 41

7.2 Ambient temperature............................................................................................. 42

7.2.1 Requirements ................................................................................................ 42

7.2.2 Method of test................................................................................................ 42

7.3 Relative humidity .................................................................................................. 42

7.3.1 Requirements ................................................................................................ 42

7.3.2 Method of test................................................................................................ 42

7.4 IP classification ..................................................................................................... 43

7.4.1 Requirements ................................................................................................ 43

7.4.2 Method of test................................................................................................ 43

8 Mechanical requirements ............................................................................................... 43

8.1 General ................................................................................................................. 43

8.2 Microphonics/impact ............................................................................................. 43

8.2.1 Requirements ................................................................................................ 43

8.2.2 Method of test................................................................................................ 43

9 Electromagnetic requirements ....................................................................................... 44

9.1 General ................................................................................................................. 44

9.2 Emission of electromagnetic radiation ................................................................... 45

9.2.1 Requirements ................................................................................................ 45

9.2.2 Method of test................................................................................................ 45

9.3 Electrostatic discharge .......................................................................................... 45

9.3.1 Requirements ................................................................................................ 45

9.3.2 Method of test................................................................................................ 45

9.4 Radio frequency disturbance ................................................................................. 46

9.4.1 Requirements ................................................................................................ 46

9.4.2 Method of test................................................................................................ 46

9.5 Magnetic fields ...................................................................................................... 46

9.5.1 Requirements ................................................................................................ 46

9.5.2 Method of test................................................................................................ 46

9.6 Alternating current powered equipment requirements ............................................ 47

9.6.1 Voltage and frequency fluctuations ................................................................ 47

9.6.2 Immunity from conducted RF ......................................................................... 47

9.6.3 Surges and ring waves .................................................................................. 48

10 Documentation .............................................................................................................. 48

10.1 Type test report .................................................................................................... 48

10.2 Certificate ............................................................................................................. 48

10.3 Operation and maintenance manual ...................................................................... 49

Annex A (informative) Neutron fluence-to-ambient dose equivalent conversion

coefficients .................................................................................................................... 50

---------------------- Page: 6 ----------------------
IEC 61322:2019  IEC 2019 – 5 –

Bibliography .......................................................................................................................... 53

Figure 1 – Test for angular response .................................................................................... 33

Figure A.1 – Neutron fluence-to-ambient dose equivalent conversion coefficients for

mono-energetic neutrons [3] ................................................................................................. 51

Table 1 – Reference and standard test conditions ................................................................. 23

Table 2 – Radiation characteristics of ambient neutron dose equivalent rate meters ............. 24

Table 3 – Electrical and environmental characteristics of ambient dose equivalent rate

meters .................................................................................................................................. 40

Table 4 – Maximum values of deviation due to electromagnetic disturbances........................ 44

Table 5 – Emission frequency range ..................................................................................... 45

Table A.1 – Neutron fluence-to-ambient dose equivalent conversion coefficients for

mono-energetic neutrons ([1], [3], [4], [7]) ............................................................................. 50

Table A.2 – Neutron fluence-to-ambient dose equivalent conversion coefficients for the

neutron reference radiation sources ([3] and ISO 8529-3) ..................................................... 52

---------------------- Page: 7 ----------------------
– 6 – IEC 61322:2019  IEC 2019
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
RADIATION PROTECTION INSTRUMENTATION –
INSTALLED AMBIENT DOSE EQUIVALENT RATE METERS,
WARNING AND MONITORING ASSEMBLIES FOR NEUTRONS
WITH ENERGIES FROM THERMAL TO 20 MeV
FOREWORD

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International Standard IEC 61322 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 published in 1994. This edition

constitutes a technical revision.

This edition includes the following significant technical changes with respect to the previous

edition:

a) this document has been updated to take account of the requirements of the relevant IEC

standards, IEC 60532:2010 and IEC 61005:2014.
---------------------- Page: 8 ----------------------
IEC 61322:2019  IEC 2019 – 7 –
The text of this document is based on the following documents:
FDIS Report on voting
45B/944/FDIS 45B/952/RVD

Full information on the voting for the approval of this document 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.

The committee has decided that the contents of this publication will remain unchange

...

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