Analysis of hard sludge removed from the steam generator at the Consolidated Edison Company of New York Indian Point 2 nuclear power station has shown that the bulk of the hard sludge is similar in composition to the soft sludge recovered from the same steam generators, and that both contain approximately 70% iron oxides. However, analysis of deposits removed from tube surfaces showed that they contain only about 30% iron oxides. Detailed analysis as well as simulation experiments have provided the basis for a model of hard sludge build-up. According to this model, a near-surface layer containing about 30% iron oxides initially forms and then sorbs other metal oxides. As the deposits undergo dehydration and consolidation, the build-up continues to include additional, mostly iron-based, oxide deposits.

Subject
Materials, Composition, Iron oxide, Metal surfaces, Oxide formation, Tubes, Steam generators, Sludge, Oxide surfaces, Zinc oxide, Scale formation, Deposit corrosion, Samples
Keywords:
Steam generators, deposits, iron oxides, sludge
© 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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