International ISo Standard ISO12183 Nuclear fuel technology - Fourth edition 2024-05 Controlled-potential coulometric measurement of plutonium Technologie du combustible nucléaire - Dosage du plutonium par coulométrie a potentiel imposé Reference number ISO 12183:2024(en) @ ISO 2024 IS0 12183:2024(en) COPYRIGHT PROTECTED DOCUMENT @IS02024 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 Email: copyright@iso.org Website: www.iso.org Published in Switzerland IS0 2024 - All rights reserved i IS0 12183:2024(en) Contents Page Foreword. .iv 1 Scope 1 2 Normative references 1 3 Terms and definitions. .1 4 Principle .1 5 Reagents. 2 6 Apparatus. .2 7 Procedure .8 7.1 Plutonium determination 8 7.2 Analysis of subsequent test samples. .14 8 Expression of quantity values 14 8.1 Calculation of the electrical calibration factor .14 8.2 Calculation of the blank .15 8.3 Fraction of electrolysed plutonium. 15 8.4 Plutonium, amount of substance and mass .16 8.5 Quality control. .16 Characteristics of the method .17 9 .17 9.1 Repeatability 9.2 Confidence interval .17 9.3 .17 Analysis time. 10 Interferences .17 11 Procedure variations and optimization 21 11.1 Accountability measurements and reference material preparation .21 11.2 Processcontrolmeasurements .21 11.3 Measurement cell design. 22 11.4 Electrolyte and electrode options 22 11.5 Test sample size. 22 11.6 Background current corrections. 23 23 11.7 Correction for iron 11.8 Control-potential adjustment .24 11.9 Calibration methodologies. 25 .25 12 Traceability to SI units Annex A (informative) Purification by anion-exchange separation .26 Annex B (informative) Determination of formal potential, Eo .28 Bibliography .29 IS02024-Allrightsreserved iii