ISO INTERNATIONAL STANDARD 4233 First edition 2023-03 Reactor technology Nuclear fusion reactors Hot helium leak testing method for high temperature pressure-bearing components in nuclear fusion reactors Technologie duréacteurRéacteurs afusion nucléaire-Méthode de controle d'étancheité par détection de fuite d'helium a chaud pour les composants sous pression a haute température de réacteurs a fusionnucleaire Reference number IS0 4233:2023(E) so @ IS0 2023 IS0 4233:2023(E) COPYRIGHT PROTECTED DOCUMENT @IS02023 All rights reserved. Unless otherwise specified, or required in the context of its implementation, 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 CP 401 · Ch. de Blandonnet 8 CH-1214 Vernier, Geneva Phone: +4122 749 0111 Email: [email protected] Website: www.iso.org Published in Switzerland ii @IS0 2023 - All rights reserved