ISO 12183:2016

DRAFT INTERNATIONAL STANDARD
ISO/DIS 12183
ISO/TC 85/SC 5 Secretariat: BSI
Voting begins on: Voting terminates on:
2015-09-01 2015-12-01
Nuclear fuel technology — Controlled-potential
coulometric assay of plutonium
Technologie du combustible nucléaire — Dosage du plutonium par coulométrie à potentiel imposé
ICS: 27.120.30
THIS DOCUMENT IS A DRAFT CIRCULATED
FOR COMMENT AND APPROVAL. IT IS
THEREFORE SUBJECT TO CHANGE AND MAY
NOT BE REFERRED TO AS AN INTERNATIONAL
STANDARD UNTIL PUBLISHED AS SUCH.
IN ADDITION TO THEIR EVALUATION AS
BEING ACCEPTABLE FOR INDUSTRIAL,
TECHNOLOGICAL, COMMERCIAL AND
USER PURPOSES, DRAFT INTERNATIONAL
STANDARDS MAY ON OCCASION HAVE TO
BE CONSIDERED IN THE LIGHT OF THEIR
POTENTIAL TO BECOME STANDARDS TO
WHICH REFERENCE MAY BE MADE IN
Reference number
NATIONAL REGULATIONS.
ISO/DIS 12183:2015(E)
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. ISO 2015

---------------------- Page: 1 ----------------------
ISO/DIS 12183:2015(E)

COPYRIGHT PROTECTED DOCUMENT
© ISO 2015, Published in Switzerland
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
Ch. de Blandonnet 8 • CP 401
CH-1214 Vernier, Geneva, Switzerland
Tel. +41 22 749 01 11
Fax +41 22 749 09 47
copyright@iso.org
www.iso.org
ii © ISO 2015 – All rights reserved

---------------------- Page: 2 ----------------------
ISO/DIS 12183
Contents Page
Foreword iv
1 Scope 1
2 Normative References 1
3 Principle 1
4 Reagents 2
5 Apparatus 2
6 Procedure 7
6.1 Plutonium determination 7
6.2 Analysis of subsequent test samples 13
7 Expression of results 14
7.1 Calculation of the electrical calibration factor 14
7.2 Calculation of the blank 14
7.3 Fraction of electrolysed plutonium 15
7.4 Plutonium content 15
7.5 Quality control 16
8 Characteristics of the method 16
8.1 Repeatability 16
8.2 Confidence interval 16
8.3 Analysis time 16
9 Interferences 17
10 Procedure variations and optimisation 20
10.1 Accountability measurements and reference material preparation 20
10.2 Process control measurements 20
10.3 Measurement cell design 21
10.4 Electrolyte and electrode options 21
10.5 Test sample size 22
10.6 Background current corrections 22
10.7 Correction for iron 23
10.8 Control-potential adjustment 23
10.9 Calibration Methodologies 23
Annex A (normative) Purification by anion-exchange separation 25
Annex B (normative) Determination of formal potential, E 27
0
Bibliography 28

© ISO 2015 – All rights reserved iii

---------------------- Page: 3 ----------------------
ISO/DIS 12183
Foreword
ISO (the International Organisation for Standardisation) 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 organisations, 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 standardisation.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 3.
The main task of the technical committee is to prepare International Standards. Draft International Standards
adopted by the technical committees are circulated to the member bodies for voting. Publication as an International
Standard requires approval by at least 75 % of the member bodies casting a vote.
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.
ISO 12813 was prepared by Technical Committee ISO/TC 85, Nuclear energy, nuclear technologies, and
radiological protection, Subcommittee SC 5, Nuclear fuel cycle.
This third edition cancels and replaces the second edition (ISO 12183:2005), which has been technically revised.

© ISO 2015 – All rights reserved iv

---------------------- Page: 4 ----------------------
ISO/DIS 12183
Nuclear Energy — Fuel Technology — Controlled-potential
coulometric assay of plutonium
1 Scope
This International Standard describes an analytical method for the electrochemical assay of pure
plutonium nitrate solutions of nuclear grade, with a total uncertainty not exceeding ± 0,2 % at the
confi
...