The stability of the primary helium-based coolant test gas for use in performance tests of materials for the Modular High-Temperature Gas-Cooled Reactor (MHTGR) was determined. Results of tests of the initial gas chemistry from General Atomics (GA) at elevated temperatures, and the associated thermodynamic predicted results are presented. The results indicated that, for this gas composition and at flow rates obtainable in the test loop, 466 ± 24°C is the highest temperature that can be maintained without significantly altering the specified gas chemistry. Four additional gas chemistries were modelled using SOLGASMIX™.

Subject
Stability, Test methods, Water, Materials, Thermodynamics, Materials performance, Reactors, Coolants, Carbon monoxide, Graphite, Impurities, Carbon, Chemical reactions
© 1993 Association for Materials Protection and Performance (AMPP). All rights reserved. No part of this publication may be reproduced, stored in a retrieval system, or transmitted, in any form or by any means (electronic, mechanical, photocopying, recording, or otherwise) without the prior written permission of AMPP. Positions and opinions advanced in this work are those of the author(s) and not necessarily those of AMPP. Responsibility for the content of the work lies solely with the author(s).
1993
Association for Materials Protection and Performance (AMPP)
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