IEC_TR_61244-4-2019.pdf

IEC TR 61244-4 Edition 1.0 2019-09 TECHNICAL REPORT Determination of long-term radiation ageing in polymers Part 4:Effects of different temperatures and dose rates under radiation conditions IEC TR 61244-4:2019-09(en)THIS PUBLICATION IS COPYRIGHT PROTECTED Copyright 2019 IEC,Geneva,Switzerland 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 IEC or IECs member National Committee in the country of the requester.If you have any questions about IEC copyright or have an enquiry about obtaining additional rights to this publication,please contact the address below or your local IEC member National Committee for further information.IEC Central Office Tel.:+41 22 919 02 11 3,rue de Varemb infoiec.ch CH-1211 Geneva 20 www.iec.ch Switzerland About the IEC The International Electrotechnical Commission(IEC)is the leading global organization that prepares and publishes International Standards for all electrical,electronic and related technologies.About IEC publications The technical content of IEC publications is kept under constant review by the IEC.Please make sure that you have the latest edition,a corrigendum or an amendment might have been published.IEC publications search-webstore.iec.ch/advsearchform The advanced search enables to find IEC publications by a variety of criteria(reference number,text,technical committee,).It also gives information on projects,replaced and withdrawn publications.IEC Just Published-webstore.iec.ch/justpublished Stay up to date on all new IEC publications.Just Published details all new publications released.Available online and once a month by email.IEC Customer Service Centre-webstore.iec.ch/csc If you wish to give us your feedback on this publication or need further assistance,please contact the Customer Service Centre:salesiec.ch.Electropedia-www.electropedia.org The worlds leading online dictionary on electrotechnology,containing more than 22 000 terminological entries in English and French,with equivalent terms in 16 additional languages.Also known as the International Electrotechnical Vocabulary(IEV)online.IEC Glossary-std.iec.ch/glossary 67 000 electrotechnical terminology entries in English and French extracted from the Terms and Definitions clause of IEC publications issued since 2002.Some entries have been collected from earlier publications of IEC TC 37,77,86 and CISPR.IEC TR 61244-4 Edition 1.0 2019-09 TECHNICAL REPORT Determination of long-term radiation ageing in polymers Part 4:Effects of different temperatures and dose rates under radiation conditions INTERNATIONAL ELECTROTECHNICAL COMMISSION ICS 17.240;29.035.01 ISBN 978-2-8322-7429-3 Registered trademark of the International Electrotechnical Commission Warning!Make sure that you obtained this publication from an authorized distributor.2 IEC TR 61244-4:2019 IEC 2019 CONTENTS FOREWORD.3 INTRODUCTION.5 1 Scope.6 2 Normative references.6 3 Terms,definitions and abbreviated terms.6 3.1 Terms and definitions.6 3.2 Abbreviated terms.7 4 Radiation induced degradation mechanisms at standard ambient conditions.8 4.1 General conventions.8 4.2 Effect of presence of oxygen.9 4.3 Effect of dose-rate effect-1:Physical aspects.9 4.4 Effect of dose-rate-2:Chemical aspects.10 4.5 Research on degradation mechanism.10 4.6 Experiences and acceleration factors.11 4.7 Low dose-rate tests and LOCA survivability.11 4.8 Effect of LOCA test environment.11 4.9 Order effects,synergistic effects,and antagonistic effects.12 4.10 Sequential test conditions equivalent to simultaneous methods.12 4.11 Studies after TMI and later.13 4.12 Arrhenius law and limitations.13 4.13 Slow degradation behaviour observed in service-aged cables.16 4.14 Inverse temperature effects.17 4.15 Role of antioxidants.17 4.16 Other thermal and radiation environment degradation characteristics.18 5 Accelerated ageing test methods.18 5.1 Sequential ageing test.18 5.1.1 General.18 5.1.2 Sequence of testing and synergistic effects.19 5.1.3 Guidance on test sequences.20 5.1.4 Assessment of accelerated ageing.20 5.2 Simultaneous ageing test.21 6 Conclusion.22 Bibliography.23 Table 1 Dose rate conditions which do not cause inhomogeneous degradation.10 Table 2 Ea value according to materials,manufacturers,and grades.14 Table 3 Changes in various properties due to inverse temperature and annealing recovery effects,investigated by several instrumental analyses 111.17 Table 4 Typical standard acceleration ageing sequence for qualification.19 Table 5 More recent standard acceleration ageing sequence for qualification.19 IEC TR 61244-4:2019 IEC 2019 3 INTERNATIONAL ELECTROTECHNICAL COMMISSION _ DETERMINATION OF LONG-TERM RADIATION AGEING IN POLYMERS Part 4:Effects of different temperatures and dose rates under radiation conditions FOREWORD 1)The International Electrotechnical Commission(IEC)is a worl