Some nuclear steam generators have experienced accelerated carbon steel corrosion at tube/support plate crevices, which eventually leads to the denting (reduction in diameter) of the Inconel* steam generator tubes due to accumulation of corrosion product in the tube/support plate crevices. This phenomenon, which was first observed in operating plants in early 1975, occurred in plants that used sea water or brackish water for condenser cooling and that had changed from phosphate secondary water chemistry to all volatile treatment (AVT--ammonia and hydrazine). Subsequently, denting was observed in plants which have operated only on AVT chemistry including plants with fresh water condenser cooling.
Subject
Acids,
Marine environments,
Water,
Fluxes,
Oxides,
Tubes,
Autoclaves,
Steam generators,
Crevices,
Phosphates,
Heat,
Magnetite,
Carbon steel
© 1980 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).
1980
Association for Materials Protection and Performance (AMPP)
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