ISO INTERNATIONAL STANDARD 21484 Secondedition 2017-01 Nuclear Energy Fuel technology Determination of the O/M ratio in MoX pellets by the gravimetric method Energie nucleaire -Technologie du combustibleDétermination du rapport O/M dans les pastilles MOX par la methode gravimétrique Reference number IS0 21484:2017(E) [so International Organization for Standardization @ IS0 2017 ZHEJIANG INSTOFSTANDARDIZATION C15956617 ed without license from IHS IS0 21484:2017(E) COPYRIGHTPROTECTEDDOCUMENT IS0 2017, Published in Switzerland All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form 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 copyrightoffice Ch. de Blandonnet 8 . CP 401 CH-1214 Vernier, Geneva, Switzerland Tel. +41 22 749 01 11 Fax +41 22 749 09 47 [email protected] www.iso.org Internatinair Prganization for Standardization ensee-ZHEJIANG INSTOF STANDARDIzARoISQa7 - All rights reserved etworking permitted without license from IHS IS0 21484:2017(E) Contents Page Foreword ..iv 1 Scope .1 2 Normative references 3 Terms and definitions ..1. 4 Principle ..1 5 Reactions .1 6 Reagents and materials .1 7 .2 Apparatus 8 Sampling. .2 9 Procedure. 2 9.1 Preliminary test. .2 9.2 Preparing the crucibles .2 9.3 Weighing the sample. .2 9.4 Heat treatment cycles .3 9.4.1 General 3 9.4.2 Example 1 .3 9.4.3 Example 2. .3 9.5 Final weighing 3 10 Calculation 10.1 Mean atomic mass of oxide after heat treatment. .4 10.2 Calculation of O/M ratio. ..4 11 Precision 11.1 Accuracy. 4 11.2 Precision. 11.3 Sensitivity .5 12 Test report ..5 Bibliography .6 iii see=ZHEJIANG INST OF STANDARDIZATION C15956617 ed withoutlicense from IHS Not for Resale, 2017/5/11 02:44:49