ISO INTERNATIONAL STANDARD 9894 First edition 1996-06-15 Subsampling of uranium hexafluoride in the liquid phase Sous-echantillonnage de Ihexafluorure d'uranium en phase liquide This material is reproduced from Iso documents under International Organization for Standardization (Iso)Copyright License number IHS/IcC/1996. Not for resale. No part of these Iso documents may be reproduced in any form, electronic retrieval system or otherwise, except as allowed in the copyright law of the country of use, or with the prior written consent of iso (Case postale 56, 1211 Geneva 20, Switzerland, Fax +41 22 7341079),IHSortheISoLicensor'smembers. ISo Reference number ISO9894:1996(E) Cnnurinht Internatinnal Nrnanizatinn fnr Stanrlarrlizatinr ISO9894:1996(E) Foreword ISO (the International OrganizationforStandardization)is a worldwidefed- eration 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 rep- resented on that committee. International organizations, governmental and non-governmental, in liaison withIsO,also take part in the work.Iso col- laboratescloselywiththeInternational Electrotechnical Commission(IEC) on allmatters of electrotechnical standardization. Draft Internationa! Standards adopted by the technical committees are cir- Standard requires approval by at least 75 % of the member bodies casting avote. International Standard ISO 9894 was prepared by Technical Committee iSO/TC 85,Nuclear energy,Subcommittee SC5.Nuclear fuel tech- nology. @ISO1996 duced or utilized in any form or by any means, electronic or mechanical, including photo- copying and microfilm, without permission in writing from the publisher. International Organization for Standardization CasePostale56-CH-1211Geneve20-Switzerland Printed in Switzerland ii ISO 9894:1996(E) INTERNATIONALSTANDARD @ISO Subsampling of uranium hexafluoride in the liquid phase 1 Scope orrunintoacontainer(olitretoo,5litre)forim purity analysis after hydrolysing the UF6. This International Standard specifies a method of sub- sampling suitable for taking aliquots from a represen- orrun into a container(0,002 litreto 0,005 litre)for tative sample of uranium hexafluoride (UF6) in the uranium assay determination of UFs. liquid phase, the latter having come from a (UF6) shipping container. Every precaution shall be taken to minimize the risk of isotopic and chemical contamination among the sam- The subsamples are intended for isotopic analysis (1 g ples. to 3 g), impurity analysis (10 g to 200 g) and uranium assay (5 g to 10 g). Carbon halides, hydrocarbons and certain metal hal- 4 Reagents and liquid refrigerants ides can be measured directly from the sample or the subsample(10gto30g). 4.1 Liquid nitrogen. 2 Normative reference 4.2 Iced water at 0 °C. The following standard contains provisions which, 4.3 Chlorine trifluoride or nitrogen doped to 25 % through reference in this text, constitute provisions of this International Standard. At the time of publication, with fluorine, optional. the edition indicated was valid. All standards are sub- ject to revision, and parties to agreements based on this International Standard are encouraged to investi- gate the possibility of applying the most recent edition 5 Apparatus of the standard indicated below. Members of IEC and IsO maintain registers of currently valid International 5.1 Metal containers Standards. Metal containers of types 1s and 2s according to iSO 7195:1993, Packaging of uranium hexafluoride ISO7195 and ANSI N14.11),or type CEA23Dare (UFe)fortransport. used. 5.2 Polytrifluorochloroethylene 3Principle (PTFCE) con- tainers, example given for clarification in figure 1. After liquifying the UF contained in the sample cylin- der,theamountinthe liguidphasewhichisremoved 5.3 Tubes in PTFCE, examples given for clarification by means