The Savannah River Plant performed destructive examination of the materials of construction of one of its leaking single-shell tanks (SST) and concluded that the leaks in the steel liner were caused by nitrate-assisted stress corrosion cracking (SCC). Some Hanford Site SSTs also have leaked. How ever, no examinations have been performed to determine the cause of the leaks in the Hanford Site SSTs. Because of similarities in materials and operation of Savannah River Plant and Hanford Site SSTs are suspected to have leaked because of nitrate-assisted SCC of the steel liner.

This report compares, pointing out similarities and differences, in the designs, materials, fabrication methods, and operating environments at each sites to determine if it is reasonable to conclude that SCC has occurred in the Hanford Site SST liners.

Subject
Materials, Rivers, Welding, Leaks, Shrinkage, Nitrates, Phosphates, Steel, Construction, Carbon steel, Wastes, Stress corrosion cracking, Residual stress
Keywords:
carbon steel, corrosion, stress corrosion cracking, SCC, single shell tanks, SST, waste, fabrication, welding
© 1994 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).
1994
Association for Materials Protection and Performance (AMPP)
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