Nuclear fuel technology - Guidelines for ceramographic preparation of UO2 sintered pellets for microstructure examination (ISO 16793:2018)

This document describes the ceramographic preparation of uranium dioxide (UO2) sintered pellets for qualitative and quantitative microstructure examinations.
These examinations can be carried out before and after thermal or chemical etching.
They enable
— observations of fissures, inter- or intra-granular pores and inclusions, and
— measurement of pore and grain size and measurement of pore and grain size distributions.
The measurement of average grain size can be carried out using a classical counting method as described in ISO 2624 or ASTM E112[3], i.e. intercept procedure, comparison with standard grids or reference photographs.
The measurement of pore-size distributions is usually carried out by an automatic image analyser. If the grain-size distributions are also measured with an image analyser, it is recommended that thermal etching be used to reveal the grain structure uniformly throughout the whole sample.

Kernbrennstofftechnologie - Leitfaden für die keramographische Herstellung gesinterter UO2-Pellets zur Untersuchung des Feingefüges (ISO 16793:2018)

Technologie du combustible nucléaire - Lignes directrices pour la préparation céramographique de pastilles UO2 frittées pour l'examen de la microstructure (ISO 16793:2018)

Le présent document décrit la préparation céramographique de pastilles de dioxyde d'uranium (UO2) frittées, permettant de réaliser des examens qualitatifs et quantitatifs de leur microstructure.
Ces examens peuvent être réalisés avant et après une attaque chimique ou thermique.
Ils permettent
— l'observation des fissures, des pores intergranulaires ou intragranulaires et des inclusions, et
— le mesurage de la taille des grains et de la porosité, ainsi que de leur distribution.
Le mesurage de la taille moyenne des grains peut être effectué par une méthode courante de comptage décrite dans l'ISO 2624 ou l'ASTM E112[3], c'est-à-dire une méthode par interception, comparaison avec des grilles normalisées ou avec des images types.
Le mesurage de la distribution des tailles de pores est généralement effectué par un analyseur d'images automatique. Si la distribution granulométrique est également mesurée avec un analyseur d'images, il est recommandé d'utiliser une attaque thermique pour révéler de façon uniforme la structure des grains de l'ensemble de l'échantillon.

Tehnologija jedrskih goriv - Smernice za pripravo keramografske preiskave mikrostrukture za sintrane pelete UO2 (ISO 16793:2018)

General Information

Status
Published
Public Enquiry End Date
30-Nov-2020
Publication Date
21-Feb-2021
Technical Committee
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
18-Feb-2021
Due Date
25-Apr-2021
Completion Date
22-Feb-2021

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SLOVENSKI STANDARD
SIST EN ISO 16793:2021
01-april-2021
Tehnologija jedrskih goriv - Smernice za pripravo keramografske preiskave
mikrostrukture za sintrane pelete UO2 (ISO 16793:2018)

Nuclear fuel technology - Guidelines for ceramographic preparation of UO2 sintered

pellets for microstructure examination (ISO 16793:2018)
Technologie du combustible nucléaire - Lignes directrices pour la préparation

céramographique de pastilles UO2 frittées pour l'examen de la microstructure (ISO

16793:2018)
Ta slovenski standard je istoveten z: EN ISO 16793:2021
ICS:
27.120.30 Cepljivi materiali in jedrska Fissile materials and nuclear
gorivna tehnologija fuel technology
SIST EN ISO 16793:2021 en,fr,de

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

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SIST EN ISO 16793:2021
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SIST EN ISO 16793:2021
EN ISO 16793
EUROPEAN STANDARD
NORME EUROPÉENNE
February 2021
EUROPÄISCHE NORM
ICS 27.120.30
English Version
Nuclear fuel technology - Guidelines for ceramographic
preparation of UO2 sintered pellets for microstructure
examination (ISO 16793:2018)
Technologie du combustible nucléaire - Lignes
directrices pour la préparation céramographique de
pastilles UO2 frittées pour l'examen de la
microstructure (ISO 16793:2018)
This European Standard was approved by CEN on 18 January 2021.

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

Poland, Portugal, Republic of North Macedonia, Romania, Serbia, 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: Rue de la Science 23, B-1040 Brussels

© 2021 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 16793:2021 E

worldwide for CEN national Members.
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SIST EN ISO 16793:2021
EN ISO 16793:2021 (E)
Contents Page

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

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SIST EN ISO 16793:2021
EN ISO 16793:2021 (E)
European foreword

The text of ISO 16793:2018 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 16793:2021 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 August 2021, and conflicting national standards shall

be withdrawn at the latest by August 2021.

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

patent rights. CEN 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, France, Germany, Greece, Hungary, Iceland,

Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Republic of

North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the

United Kingdom.
Endorsement notice

The text of ISO 16793:2018 has been approved by CEN as EN ISO 16793:2021 without any modification.

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SIST EN ISO 16793:2021
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SIST EN ISO 16793:2021
INTERNATIONAL ISO
STANDARD 16793
Second edition
2018-08
Nuclear fuel technology — Guidelines
for ceramographic preparation of UO
sintered pellets for microstructure
examination
Technologie du combustible nucléaire — Lignes directrices pour la
préparation céramographique de pastilles UO frittées pour l'examen
de la microstructure
Reference number
ISO 16793:2018(E)
ISO 2018
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SIST EN ISO 16793:2021
ISO 16793:2018(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2018

All rights reserved. Unless otherwise specified, or required in the context of its implementation, 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
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Fax: +41 22 749 09 47
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii © ISO 2018 – All rights reserved
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SIST EN ISO 16793:2021
ISO 16793:2018(E)
Contents Page

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

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

2 Normative references ...................................................................................................................................................................................... 1

3 Terms and definitions ..................................................................................................................................................................................... 1

4 Principle ........................................................................................................................................................................................................................ 1

5 Procedures .................................................................................................................................................................................................................. 2

5.1 General ........................................................................................................................................................................................................... 2

5.2 Sample preparation without mounting ............................................................................................................................. 2

5.3 Sample preparation with mounting, not needing subsequent dismounting ..................................... 2

5.4 Sample preparation with mounting, needing subsequent dismounting .............................................. 2

6 Apparatus ..................................................................................................................................................................................................................... 2

7 Reagents and consumables ....................................................................................................................................................................... 3

8 Methods ......................................................................................................................................................................................................................... 4

8.1 Sectioning .................................................................................................................................................................................................... 4

8.2 Mounting ...................................................................................................................................................................................................... 4

8.3 Grinding ........................................................................................................................................................................................................ 4

8.4 Polishing ....................................................................................................................................................................................................... 5

8.5 Dismounting .............................................................................................................................................................................................. 5

9 Etching ............................................................................................................................................................................................................................. 5

9.1 Introduction .............................................................................................................................................................................................. 5

9.2 Chemical etching ................................................................................................................................................................................... 5

9.3 Thermal etching ..................................................................................................................................................................................... 5

Bibliography ................................................................................................................................................................................................................................ 8

© ISO 2018 – All rights reserved iii
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SIST EN ISO 16793:2021
ISO 16793:2018(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

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

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

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