ISO INTERNATIONAL STANDARD 10981 Second edition 2004-06-15 Nuclear fuel technology Determination of uranium in reprocessing-plant dissolver solution Liquid chromatography method Technologieducombustiblenucleaire-DosagedeIuraniumdansles solutionsdedissolutiondesusinesderetraitementMethodepar chromatographie enphase liquide Reference number ISO 10981:2004(E) ISO @ ISO 2004 ISO10981:2004(E) PDF disclaimer This PDF file may contain embedded typefaces. In accordance with Adobe's licensing policy, this file may be printed or viewed but shall not be edited unless the typefaces which are embedded are licensed to and installed on the computer performing the editing. In accepts no liability in this area Adobeis atrademarkofAdobeSystems Incorporated. the unlikely event that a problem relating to it is found, please inform the Central Secretariat at the address given below. ? ISO2004 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from either isO at the address below or IsO's memberbody in the country of the requester. ISO copyright office Case postale 56.CH-1211Geneva 20 Tel. + 41 22 749 01 11 Fax + 41 22 749 09 47 E-mail [email protected] Web www.iso.org Published in Switzerland ii ISO 2004-All rights reserved ISO 10981:2004(E) Contents Page Foreword 1 Scope 2 Normativereferences 3 Principle . 4 Reagents. 5 Apparatus. 6 Procedure. 7 Expression ofresults. 8 Precisionandaccuracy.... 9 Annex A (informative) Example of computer output from chromatography package ... Iso2004-All rightsreserved ili ISO 10981:2004(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 International Standards are drafted in accordance with the rules given in the ISO/lEC Directives, Part 2. The main task of technical committees is to prepare International Standards. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as ar 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 ISO 10981 was prepared by Technical Committee ISO/TC 85, Nuclear energy, Subcommittee SC 5, Nuclear fuel technology. revised. iv @ ISO 2004 - All rights reserved INTERNATIONAL STANDARD ISO 10981:2004(E) Nuclear fuel technology Determination of uranium in reprocessing-plant dissolver solution Liquid chromatography method 1 Scope ThisInternationalStandardspecifiesananalytical methodfordeterminingtheuraniumconcentrationbetween fast-breeder reactors. It specifies how interference by nitrite and plutonium ions is prevented. The other constituents of fuel solutions do not interfere. This method is suitable for process control, but not for accountancy purposes. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. IsO 8299:—1), Nuclear fuel technology — Determination of isotopic content and elemental uranium and plutonium concentrations of nuclear materials in nitric acid solutions Thermal-ionization mass spectrometry 3 Principle 3.1 The sample is diluted in aqueous ascorbic acid solution until the amount of free acid of the nitric solution injected onto the reversed-phase column is lower than 0,1 mol/l in HNO3 (1 < pH < 3). NOTE 1 The column is destroyed when the pH of the solution in contact with the stationary phase is either lower than 1 or higher than 9. To avoid any plutonium hydrolysis, the pH of the