International ISO Standard IS0 16646 First edition Fusion installations Criteria 2024-06 for the design and operation of confinement and ventilation systems of tritium fusion facilities and fusion fuel handling facilities Installations de fusion - Criteres pour la conception et I'exploitation des systemes de confinement et de ventilation des installations de fusion avec tritium et des installations de traitement des combustibles defusion Reference number ISO 16646:2024(en) @ISO 2024 IS0 16646:2024(en) COPYRIGHT PROTECTED DOCUMENT @ ISO 2024 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 ofthe requester. ISO copyright office CP 401 : Ch. de Blandonnet 8 CH-1214 Vernier, Geneva Phone:+41227490111 Email: [email protected] Website: www.iso.org Published in Switzerland @ IS0 2024 - All rights reserved ii IS0 16646:2024(en) Contents Page Foreword. V Introduction .vi 1 Scope. 1 2 Normative references .1 3 Terms and definitions. .1 General confinement specificities of tritium fusion facilities or fusion fuel handling 4 facilities 7 4.1 General .7 4.2 Inventories to identify for fusion facilities confinement .9 4.3 Specific systems or loads used in fusion facilities. 10 .10 4.4 General description of confinement systems for fusion facilities 4.4.1 .10 General First confinement system. 4.4.2 13 Secondary confinement system. 4.4.3 .14 4.4.4 Fuel cycle systems 15 4.4.5 Tritium material compatibility 15 5 .15 Functions and safety aspects for confinement and ventilation systems 5.1 General. 15 5.2 Main functions. .16 5.3 General principles 17 .17 5.4 Risk assessment procedure 5.4.1 Preliminary analysis. 17 5.4.2 Risk evaluation. .19 5.4.3 Safety classification. 20 21 Architecture and description of the different confinement systems 6 .21 6.1 General 6.2 Static confinement of radioactive material 21 6.2.1 21 Containment barriers and systems Isolation function (static containment) 21 6.2.2 23 6.3 Ventilation of the volumes within the first confinement system 23 6.3.1 General 23 6.3.2 Vacuum vessel exhaust process 23 6.3.3 Primary containment pressure limiter .24 6.3.4 Localand/orcentraliseddetritiationsystem 6.3.5 Ventilation of the volume between first and second containment barriers of the first confinement system 24 .24 6.3.6 Cryogenic systems. Ventilation of the volumes within the second confinement system. 25 6.4 25 6.4.1 General 25 6.4.2 Rooms and building ventilation systems. Detritiation systems. 25 6.4.3 6.4.4 Local ventilation systems 26 6.4.5 Ventilation of the volumes located outside the secondary confinement 26 6.4.6 Miscellaneous ventilation systems not connected with containment envelopes. 26 Requirements for the design of ventilation systems 27 .27 7.1 General .27 7.2 Dynamic confinement. 7.2.1 .27 General 7.2.2 Classification of the installation into potentially contaminated areas (confinement classification) 28 7.2.3 30 Factors influencing the design of ventilation systems 7.2.4 Negative pressure. 30 @ IS0 2024 - All rights reserved iii