Re-sintering test for UO2, (U,Gd)O2 and (U,Pu)O2 pellets (ISO 15646:2014)

ISO 15646:2014 describes a procedure for measuring the densification of UO2, (U,Gd)O2, and (U,Pu)O2 pellets, achieved by heat treatment under defined conditions.
The densification of fuel in power operation is an important design feature. Essentially, it is dependent on structural parameters such as pore size, spatial pore distribution, grain size, and in the case of (U,Gd)O2 and (U,Pu)O2, oxide phase structure. A thermal re-sintering test can be used to characterize the dimensional behaviour of the pellets under high temperature. The results of this test are used by the fuel designer to predict dimensional behaviour in the reactor, because thermal densification in the reactor is also dependent on these structural parameters, albeit in a differing manner in terms of quantity.

Nachsintertest für UO2-, (U,Gd)O2- und (U,Pu)O2-Pellets (ISO 15646:2014)

Test de refrittage pour pastilles UO2, (U,Gd)O2 et (U,Pu)O2 (ISO 15646:2014)

L'ISO 15646:2014 décrit un mode opératoire de mesurage de la densification de pastilles de UO2, (U,Gd)O2 et (U,Pu)O2 par traitement thermique dans des conditions définies.
La densification du combustible en réacteur est une caractéristique de conception essentielle. Elle dépend principalement de paramètres structuraux comme la taille des pores, la distribution des pores dans l'espace, la taille des grains, et dans le cas des pastilles (U,Gd)O2 et (U,Pu)O2, de la structure de la phase d'oxyde. Il est possible d'avoir recours à un test de refrittage thermique afin de caractériser le comportement dimensionnel des pastilles à haute température. Les résultats de ce test sont utilisés par le concepteur de combustible afin de prévoir le comportement dimensionnel des pastilles dans le réacteur car la densification thermique dans le réacteur dépend aussi de ces paramètres structuraux, dans des proportions différentes.

Preskus s posintranjem za pelete UO2, (U,Gd)O2 in (U,Pu)O2 (ISO 15646:2014)

Standard ISO 15646:2014 opisuje postopek za merjenje zgoščevanja peletov UO2, (U,Gd)O2 in (U,Pu)O2, doseženega s toplotno obdelavo v definiranih pogojih. Zgoščevanje goriva kot vira energije je pomembna oblikovna značilnost. V osnovi je odvisna od strukturnih parametrov, kot so velikost por, prostorska porazdelitev por, velikost zrn ter (v primeru (U,Gd)O2 in (U,Pu)O2) strukture oksidne faze. Preskus termičnega ponovnega sintranja je mogoče uporabiti za opis dimenzionalnega vedenja peletov pri visoki temperaturi. Projektant goriva uporabi rezultate tega preskusa za napovedovanje dimenzionalnega vedenja v reaktorju, saj je toplotno zgoščevanje v reaktorju odvisno tudi od teh strukturnih parametrov, čeprav v smislu količine na drugačen način.

General Information

Status
Published
Public Enquiry End Date
29-Nov-2015
Publication Date
16-May-2016
Technical Committee
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
03-May-2016
Due Date
08-Jul-2016
Completion Date
17-May-2016

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SLOVENSKI STANDARD
SIST EN ISO 15646:2016
01-junij-2016
Preskus s posintranjem za pelete UO2, (U,Gd)O2 in (U,Pu)O2 (ISO 15646:2014)
Re-sintering test for UO2, (U,Gd)O2 and (U,Pu)O2 pellets (ISO 15646:2014)
Nachsintertest für UO2-, (U,Gd)O2- und (U,Pu)O2-Pellets (ISO 15646:2014)
Test de refrittage pour pastilles UO2, (U,Gd)O2 et (U,Pu)O2 (ISO 15646:2014)
Ta slovenski standard je istoveten z: EN ISO 15646:2016
ICS:
27.120.30 Cepljivi materiali in jedrska Fissile materials and nuclear
gorivna tehnologija fuel technology
SIST EN ISO 15646:2016 en

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

---------------------- Page: 1 ----------------------
SIST EN ISO 15646:2016
---------------------- Page: 2 ----------------------
SIST EN ISO 15646:2016
EN ISO 15646
EUROPEAN STANDARD
NORME EUROPÉENNE
April 2016
EUROPÄISCHE NORM
ICS 27.120.30
English Version
Re-sintering test for UO2, (U,Gd)O2 and (U,Pu)O2 pellets
(ISO 15646:2014)

Test de refrittage pour pastilles UO2, (U,Gd)O2 et Nachsintertest für UO2-, (U,Gd)O2- und (U,Pu)O2-

(U,Pu)O2 (ISO 15646:2014) Pellets (ISO 15646:2014)
This European Standard was approved by CEN on 21 February 2016.

CEN 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 CEN

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 CEN member into its own language and notified to the CEN-CENELEC Management

Centre has the same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,

Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania,

Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and

United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels

© 2016 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 15646:2016 E

worldwide for CEN national Members.
---------------------- Page: 3 ----------------------
SIST EN ISO 15646:2016
EN ISO 15646:2016 (E)
Contents Page

European foreword ....................................................................................................................................................... 3

---------------------- Page: 4 ----------------------
SIST EN ISO 15646:2016
EN ISO 15646:2016 (E)
European foreword

The text of ISO 15646:2014 has been prepared by Technical Committee ISO/TC 85 “Nuclear energy,

nuclear technologies, and radiological protection” of the International Organization for Standardization

(ISO) and has been taken over as EN ISO 15646:2016 by Technical Committee CEN/TC 430 “Nuclear

energy, nuclear technologies, and radiological protection” the secretariat of which is held by AFNOR.

This European Standard shall be given the status of a national standard, either by publication of an

identical text or by endorsement, at the latest by October 2016, and conflicting national standards shall

be withdrawn at the latest by October 2016.

Attention is drawn to the possibility that some of the elements of this document may be the subject of

patent rights. CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent

rights.

According to the CEN-CENELEC Internal Regulations, the national standards organizations of the

following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria,

Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia,

France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta,

Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland,

Turkey and the United Kingdom.
Endorsement notice

The text of ISO 15646:2014 has been approved by CEN as EN ISO 15646:2016 without any modification.

---------------------- Page: 5 ----------------------
SIST EN ISO 15646:2016
---------------------- Page: 6 ----------------------
SIST EN ISO 15646:2016
INTERNATIONAL ISO
STANDARD 15646
First edition
2014-06-15
Re-sintering test for UO , (U,Gd)O
2 2
and (U,Pu)O pellets
Test de refrittage pour pastilles UO , (U,Gd)O et (U,Pu)O
2 2 2
Reference number
ISO 15646:2014(E)
ISO 2014
---------------------- Page: 7 ----------------------
SIST EN ISO 15646:2016
ISO 15646:2014(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2014

All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form

or by any means, electronic or mechanical, including photocopying, or posting on the internet or an intranet, without prior

written permission. Permission can be requested from either ISO at the address below or ISO’s member body in the country of

the requester.
ISO copyright office
Case postale 56 • CH-1211 Geneva 20
Tel. + 41 22 749 01 11
Fax + 41 22 749 09 47
E-mail copyright@iso.org
Web www.iso.org
Published in Switzerland
ii © ISO 2014 – All rights reserved
---------------------- Page: 8 ----------------------
SIST EN ISO 15646:2016
ISO 15646:2014(E)
Contents Page

Foreword ........................................................................................................................................................................................................................................iv

1 Scope ................................................................................................................................................................................................................................. 1

2 Brief description of procedure .............................................................................................................................................................. 1

3 Incidents........................................................................................................................................................................................................................ 1

4 Apparatus ..................................................................................................................................................................................................................... 1

4.1 Equipment for measuring density ......................................................................................................................................... 1

4.2 Heat treatment furnace ................................................................................................................................................................... 2

5 Reagents ........................................................................................................................................................................................................................ 2

6 Sampling ........................................................................................................................................................................................................................ 2

7 Procedure..................................................................................................................................................................................................................... 2

7.1 Density measurements before heat treatment ........................................................................................................... 2

7.2 Heat treatment ........................................................................................................................................................................................ 3

7.3 Density measurements after heat treatment ................................................................................................................ 3

8 Evaluation .................................................................................................................................................................................................................... 3

9 Precision of the procedure ......................................................................................................................................................................... 4

10 Test report ................................................................................................................................................................................................................... 4

Annex A (informative) Relationship between pellet mass evolution and O/M ratio evolution ..............5

Bibliography ................................................................................................................................................................................................................................ 6

© ISO 2014 – All rights reserved iii
---------------------- Page: 9 ----------------------
SIST EN ISO 15646:2016
ISO 15646:2014(E)
Foreword

ISO (the International Organization for Standardization) is a worldwide federation of national standards

bodies (ISO member bodies). The work of preparing International Standards is normally carried out

through ISO technical committees. Each member body interested in a subject for which a technical

committee has been established has the right to be represented on that committee. International

organizations, governmental and non-governmental, in liaison with ISO, also take part in the work.

ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of

electrotechnical standardization.

The procedures used to develop this document and those intended for its further maintenance are

described in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the

different types of ISO documents should be noted. This document was drafted in accordance with the

editorial rules of the ISO/IEC Directives, Part 2 (see www.iso.org/directives).

Attention is drawn to the possibility that some of the elements of this document may be the subject of

patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of

any patent rights identified during the development of the document will be in the Introduction and/or

on the ISO list of patent declarations received (see www.iso.org/patents).

Any trade name used in this document is information given for the convenience of users and does not

constitute an endorsement.

For an explanation on the meaning of ISO specific terms and expressions related to conformity

assessment, as well as information about ISO’s adherence to the WTO principles in the Technical Barriers

to Trade (TBT) see the following URL: Foreword - Supplementary information

The committee responsible for this document is ISO/TC 85, Nuclear energy, nuclear technologies, and

radiological protection, Subcommittee SC 5, Nuclear fuel cycle.
iv © ISO 2014 – All righ
...

SLOVENSKI STANDARD
kSIST FprEN ISO 15646:2015
01-november-2015

Preskus s posintranjem za UO2-, (U,Gd)O2- in (U,Pu)O2 - pelete (ISO 15646:2014)

Re-sintering test for UO2, (U,Gd)O2 and (U,Pu)O2 pellets (ISO 15646:2014)
Nachsintertest für UO2-, (U,Gd)O2- und (U,Pu)O2-Pellets (ISO 15646:2014)
Test de refrittage pour pastilles UO2, (U,Gd)O2 et (U,Pu)O2 (ISO 15646:2014)
Ta slovenski standard je istoveten z: FprEN ISO 15646
ICS:
27.120.30 Fisijski materiali Fissile materials
kSIST FprEN ISO 15646:2015 en

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

---------------------- Page: 1 ----------------------
kSIST FprEN ISO 15646:2015
---------------------- Page: 2 ----------------------
kSIST FprEN ISO 15646:2015
EUROPEAN STANDARD
FINAL DRAFT
FprEN ISO 15646
NORME EUROPÉENNE
EUROPÄISCHE NORM
August 2015
ICS 27.120.30
English Version
Re-sintering test for UO2, (U,Gd)O2 and (U,Pu)O2 pellets (ISO
15646:2014)

Test de refrittage pour pastilles UO2, (U,Gd)O2 et (U,Pu)O2 Nachsintertest für UO2-, (U,Gd)O2- und (U,Pu)O2-Pellets

(ISO 15646:2014) (ISO 15646:2014)

This draft European Standard is submitted to CEN members for unique acceptance procedure. It has been drawn up by the Technical

Committee CEN/TC 430.

If this draft becomes a European Standard, CEN 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.

This draft European Standard was established by CEN in three official versions (English, French, German). A version in any other language

made by translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management

Centre has the same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,

Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania,

Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United

Kingdom.

Recipients of this draft are invited to submit, with their comments, notification of any relevant patent rights of which they are aware and to

provide supporting documentation.

Warning : This document is not a European Standard. It is distributed for review and comments. It is subject to change without notice and

shall not be referred to as a European Standard.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels

© 2015 CEN All rights of exploitation in any form and by any means reserved Ref. No. FprEN ISO 15646:2015 E

worldwide for CEN national Members.
---------------------- Page: 3 ----------------------
kSIST FprEN ISO 15646:2015
FprEN ISO 15646:2015 (E)
Contents Page

European foreword .............................................................................................................................................3

---------------------- Page: 4 ----------------------
kSIST FprEN ISO 15646:2015
FprEN ISO 15646:2015 (E)
European foreword

The text of ISO 15646:2014 has been prepared by Technical Committee ISO/TC 85 “Nuclear energy, nuclear

technologies, and radiological protection” of the International Organization for Standardization (ISO) and has

been taken over as FprEN ISO 15646:2015 by Technical Committee CEN/TC 430 “Nuclear energy, nuclear

technologies, and radiological protection” the secretariat of which is held by AFNOR.

This document is currently submitted to the Unique Acceptance Procedure.
Endorsement notice

The text of ISO 15646:2014 has been approved by CEN as FprEN ISO 15646:2015 without any modification.

---------------------- Page: 5 ----------------------
kSIST FprEN ISO 15646:2015
---------------------- Page: 6 ----------------------
kSIST FprEN ISO 15646:2015
INTERNATIONAL ISO
STANDARD 15646
First edition
2014-06-15
Re-sintering test for UO , (U,Gd)O
2 2
and (U,Pu)O pellets
Test de refrittage pour pastilles UO , (U,Gd)O et (U,Pu)O
2 2 2
Reference number
ISO 15646:2014(E)
ISO 2014
---------------------- Page: 7 ----------------------
kSIST FprEN ISO 15646:2015
ISO 15646:2014(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2014

All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form

or by any means, electronic or mechanical, including photocopying, or posting on the internet or an intranet, without prior

written permission. Permission can be requested from either ISO at the address below or ISO’s member body in the country of

the requester.
ISO copyright office
Case postale 56 • CH-1211 Geneva 20
Tel. + 41 22 749 01 11
Fax + 41 22 749 09 47
E-mail copyright@iso.org
Web www.iso.org
Published in Switzerland
ii © ISO 2014 – All rights reserved
---------------------- Page: 8 ----------------------
kSIST FprEN ISO 15646:2015
ISO 15646:2014(E)
Contents Page

Foreword ........................................................................................................................................................................................................................................iv

1 Scope ................................................................................................................................................................................................................................. 1

2 Brief description of procedure .............................................................................................................................................................. 1

3 Incidents........................................................................................................................................................................................................................ 1

4 Apparatus ..................................................................................................................................................................................................................... 1

4.1 Equipment for measuring density ......................................................................................................................................... 1

4.2 Heat treatment furnace ................................................................................................................................................................... 2

5 Reagents ........................................................................................................................................................................................................................ 2

6 Sampling ........................................................................................................................................................................................................................ 2

7 Procedure..................................................................................................................................................................................................................... 2

7.1 Density measurements before heat treatment ........................................................................................................... 2

7.2 Heat treatment ........................................................................................................................................................................................ 3

7.3 Density measurements after heat treatment ................................................................................................................ 3

8 Evaluation .................................................................................................................................................................................................................... 3

9 Precision of the procedure ......................................................................................................................................................................... 4

10 Test report ................................................................................................................................................................................................................... 4

Annex A (informative) Relationship between pellet mass evolution and O/M ratio evolution ..............5

Bibliography ................................................................................................................................................................................................................................ 6

© ISO 2014 – All rights reserved iii
---------------------- Page: 9 ----------------------
kSIST FprEN ISO 15646:2015
ISO 15646:2014(E)
Foreword

ISO (the International Organization for Standardization) is a worldwide federation of national standards

bodies (ISO member bodies). The work of preparing International Standards is normally carried out

through ISO technical committees. Each member body interested in a subject for which a technical

committee has been established has the right to be represented on that committee. International

organizations, governmental and non-governmental, in liaison with ISO, also take part in the work.

ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of

electrotechnical standardization.

The procedures used to develop this document and those intended for its further maintenance are

described in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the

different types of ISO documents should be noted. This document was drafted in accordance with the

editorial rules of the ISO/IEC Directives, Part 2 (see www.iso.org/directives).

Attention is drawn to the possibility that some of the elements of this document may be the subject of

patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of

any patent rights identified during the development of the document will be in the Introduction and/or

on the ISO list of patent declarations received (see www.iso.org/patents).

Any trade name used in this document is information given for the convenience of users and does not

constitute an endorsement.

For an explanation on the meaning of ISO specific terms and expressions related to conformity

assessment, as well as information about ISO’s adherence to the WTO principles in the Technical Barriers

to Trade (TBT) see the following URL: Foreword - Supplementary information

The committee responsible for this document is ISO/TC 85, Nuclear energy, nuclear technologies, and

radiological protection, Subcommittee SC 5, Nuclear fuel cycle.
iv © ISO 2014 – All rights reserved
---------------------- Page: 10 ----------------------
kSIST FprEN ISO 15646:2015
INTERNATIONAL STANDARD ISO 15646:2014(E)
Re-sintering test for UO , (U,Gd)O and (U,Pu)O pellets
2 2 2
1 Scope

This International Standard describes a procedure for measuring the densification

...

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