ISO INTERNATIONAL STANDARD 21483 First edition 2013-11-01 Determination of solubility in nitric acid of plutonium in unirradiated mixed oxide fuel pellets (U, Pu) O2 Détermination de la solubilite dans I'acide nitrique du plutonium des pastilles (U, Pu) 02 de combustibles d'oxydes mixtes non irradies Reference number IS0 21483:2013(E) LSO IS02013 HS under ted without license from IHS Not for Resale IS0 21483:2013(E) COPYRIGHTPROTECTEDDOCUMENT ISO2013 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 [email protected] Web www.iso.org Published in Switzerland @ IS0 2013 - All rights reserved No reproductic networking permitted without license from IHS Not for Resale IS0 21483:2013(E) Contents Page Foreword ..iv 1 Scope. 2 Principle ..1 3 Interferences 4 Reagents 4.1 Concentrated nitric acid. .1 4.2 Nitric acid high 4.3 Nitric acid low. 4.4 Concentrated hydrofluoric acid 4.5 Mixture of acid. .1 4.6 Sodium hydroxide 2 5 Apparatus .2 5.1 Analytical balance. .2 5.2 Dissolution apparatus with total reflux condenser. . 2 5.3 Dissolution apparatus without total reflux condenser . 2 5.4 Second dissolution apparatus (polytetrafluoroethylene, PTFE, high density polyethylene, HDPE) ..2 5.5 Filter apparatus .2 6 Sampling. .2 7 Procedure. .3 7.1 Preparation of the sample .3 7.2 Dissolution procedure. .3 7.3 Treatment of the residue ..3 7.4 Plutonium determination .3 7.5 Repeat solubility test. .3 8 Expression of results 8.1 Method of calculation 4 8.2 Total uncertainty of the Pu measurement 4 9 Test report Bibliography iii vided by IHS under license with ISt ed without license from IHS Not for Resale