SIST EN 62598:2013

SLOVENSKI STANDARD
SIST EN 62598:2013
01-oktober-2013
1DGRPHãþD
SIST EN 60405:2008
-HGUVNDPHULOQDRSUHPD.RQVWUXNFLMVNH]DKWHYHLQUD]YUVWLWHYUDGLRPHWULþQLK
PHULOQLNRY
Nuclear instrumentation - Constructional requirements and classification of radiometric
gauges
Strahlungsmessgeräte - Konstruktionsanforderungen und Klassifikation radiometrischer
Einrichtungen
Instrumentation nucléaire - Exigences de construction et classification pour les jauges
radiométriques
Ta slovenski standard je istoveten z: EN 62598:2013
ICS:
27.120.01 Jedrska energija na splošno Nuclear energy in general
SIST EN 62598:2013 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN 62598:2013

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SIST EN 62598:2013

EUROPEAN STANDARD
EN 62598

NORME EUROPÉENNE
August 2013
EUROPÄISCHE NORM

ICS 27.120 Supersedes EN 60405:2007


English version


Nuclear instrumentation -
Constructional requirements and classification of radiometric gauges
(IEC 62598:2011)


Instrumentation nucléaire -  Strahlungsmessgeräte -
Exigences de construction et classification Konstruktionsanforderungen und
pour les jauges radiométriques Klassifikation radiometrischer
(CEI 62598:2011) Messanordnungen
(IEC 62598:2011)





This European Standard was approved by CENELEC on 2013-07-22. 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-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
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,
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, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom.

CENELEC
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung

Management Centre: Avenue Marnix 17, B - 1000 Brussels


© 2013 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Ref. No. EN 62598:2013 E

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SIST EN 62598:2013
EN 62598:2013 - 2 -

Foreword
This document (EN 62598:2013) consists of the text of IEC 62598:2011 prepared by IEC/TC 45 "Nuclear
instrumentation".
The following dates are fixed:
(dop) 2014-07-22
• latest date by which the document has
to be implemented at national level by
publication of an identical national
standard or by endorsement
• latest date by which the national (dow) 2016-07-22
standards conflicting with the

document have to be withdrawn

This document supersedes EN 60405:2007.
EN 62598:2013 includes the following significant technical changes with respect to EN 60405:2007:
– 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 by one digit indicating the applied revision of
EN 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 classes.
– Revision of the procedure for dose equivalent measurements.
– Addition of Annex A (informative) "Guidelines for the installation of radiometric gauges".
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CENELEC [and/or CEN] shall not be held responsible for identifying any or all such patent
rights.
Endorsement notice
The text of the International Standard IEC 62598:2011 was approved by CENELEC as a European
Standard without any modification.

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SIST EN 62598:2013
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Annex ZA
(normative)

Normative references to international publications
with their corresponding European publications

The following documents, in whole or in part, are normatively referenced in this document and are
indispensable for its application. For dated references, only the edition cited applies. For undated
references, the latest edition of the referenced document (including any amendments) applies.

NOTE  When an international publication has been modified by common modifications, indicated by (mod), the relevant EN/HD
applies.

Publication Year Title EN/HD Year

IEC 60050-394 2007 International Electrotechnical Vocabulary - - -
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 - -
utilizing 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 Radiation 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 utilizing ionizing - -
radiation with continuous or switching output


IEC 61005 (mod) 2003 Radiation protection instrumentation - EN 61005 2004
Neutron ambient dose equivalent (rate)
meters


IEC 61010-1 2010 Safety requirements for electrical equipment EN 61010-1 2010
+ corr. May 2011 for measurement, control and laboratory use -
Part 1: General requirements


IEC 61326 Series Electrical equipment for measurement, EN 61326 Series
control and laboratory use -
EMC requirements


IEC 61336 1996 Nuclear instrumentation - Thickness - -
measurement systems utilizing ionizing
radiation - Definitions and tests methods


ISO 361 1975 Basic ionizing radiation symbol - -


ISO 921 1997 Nuclear energy - Vocabulary - -

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SIST EN 62598:2013
EN 62598:2013 - 4 -
Publication Year Title EN/HD Year
ISO 2919 1999 Radiation protection - Sealed radioactive - -
sources - General requirements and
classification

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SIST EN 62598:2013
IEC 62598
®

Edition 1.0 2011-03
INTERNATIONAL
STANDARD


Nuclear instrumentation – Constructional requirements and classification of
radiometric gauges
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
PRICE CODE
T
ICS 27.120 ISBN 978-2-88912-421-3

® Registered trademark of the International Electrotechnical Commission

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SIST EN 62598:2013
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CONTENTS
FOREWORD . 4
INTRODUCTION . 6
1 Scope and object . 7
2 Normative 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
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 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 against 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 open 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 checking 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

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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 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 gauges . 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 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

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SIST EN 62598:2013
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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 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,
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. International, 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 formal 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 for 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) 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 shall 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 certification 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 injury, 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 cited 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 identifying any or all 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 based 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.

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SIST EN 62598:2013
62598  IEC: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,
• replaced by a revised edition, or
• amended.

A bilingual version of this publication may be issued at a later date.

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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, 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 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 classes.
– Revision of the procedure for dose equivalent measurements.
– Addition of Annex A (informative) "Guidelines for the installation of radiometric gauges".

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SIST EN 62598:2013
62598  IEC:2011(E) – 7 –
NUCLEAR INSTRUMENTATION –
CONSTRUCTIONAL REQUIREMENTS
AND CLASSIFICATION OF RADIOMETRIC GAUGES



1 Scope and object
This International 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 applies 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 analogously 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
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 Electrotechnical 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 utilizing 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, Radiation 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 utilizing 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

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SIST EN 62598:2013
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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 921:1997, 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 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.
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 detector-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 and determined by the purpose for which it was designed.
3.5
radiometric gauge
control and measuring assembly consisting of at least one radioactive source, at least one
detector and the mechanical devices required for non-destructive measurement of a process
quantity
3.6
sealed source
radioactive source that is sealed in a solid and inert capsule or is permanently incorporated in
solid and inert materials so that dispersion of radioactive substances under normal conditions
of use is substantially prevented; at least one dimension shall be ≥ 0,2 cm

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62598  IEC:2011(E) – 9 –
3.7
source holder
device used to support and fix the radioactive source
NOTE In the context of this standard the term source holder means the part of the device which supports or holds
the source, e,g., the shutter or a part of the housing.
3.8
source housing
that portion of the measuring head which includes the radioactive source, its holder and
primary shielding device and shutter mechanism, if any
NOTE If the source housing is not part of a measuring head the term stand alone source housing is used
(see 3.9).
3.9
stand alone source housing
device which includes the radioactive source, its holder, primary shielding, collimator and
optional shutter mechanism
3.10
useful radiation; useful beam
portion of radiation that is emitted by the radioactive source and used for measurement
4 Classification of radiometric gauge types
4.1 Category A: Radiometric gauges with restricted beam
Category A comprises gauges equipped with a device for collimation of the radiation, thereby
restricting the useful beam.
The gauge shall be designed in such a way that the radiation, except for the useful beam, is
attenuated in conformity with the requirements of this standard (see Figure 1).

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Fixed level or density gauge Tracking level gauge Level or density gauge
with the radioactive source
inside the material container




Fixed thickness gauge Moveable thickness gauge Back-scatter measuring system
IEC  533/11
Key
D detector housing
S source housing
Figure 1 – Schematic arrangement of Category A gauges

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SIST EN 62598:2013
62598  IEC:2011(E) – 11 –
4.2 Category B: Radiometric gauges with omnidirectional beam
Category B comprises gauges without a device for collimation of the radiation in one or more
directions of the useful beam or where the alignment does not comply with the requirements
of Category A gauges (see Figure 2).





Gauge with the radioactive source Gauge with the radioactive source Tracking level gauge with the
inside the material container and the detector inside the radioactive source inside
material container the material container
IEC  534/11

Key
D detector housing
S source housing
Figure 2 – Schematic arrangement of Category B gauges
4.3 Category C: Stand alone source housings for fixed radiometric gauges
Category C comprises stand alone source housings for radiometric gauges equipped with
shielding and properties for collimation of the useful beam. The source housing shall be
designed in such a way that the radiation, except for the useful beam, is attenuated in
conformity with the requirements of this standard (see Figure 3).
NOTE Such source housings are used in fixed level or density gauging systems in which the source housing and
the detector are independent units and the useful beam is not restricted by the detector but by additional radiation
protection measures.

S

IEC  535/11

Figure 3 – Category C stand alone source housing for fixed level or density gauges

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4.4 Dose rate classes
The gauges shall be cl
...