Among the many factors which influence the maintainability and maintenance costs of water cooled nuclear power plants are the effects of radiation fields throughout the plant. Barring release of fission products directly to the coolant from failures of the fuel cladding, the major source of these fields in the out-reactor portions of the plant are activated corrosion products (crud).1  The bulk of crud formation is generally attributed to corrosion products produced from the materials of construction of the primary coolant system, erosion of stellite valve pins, seal surfaces, etc. These corrosion/erosion products are released to the primary coolant stream and transported to the reactor core, where they are deposited on the fuel elements and become activated by the neutron flux. It is implicit that these deposits within the core have a finite residence time to allow the degree of activation generally encountered in crud samples.2  These deposits are then released to the primary coolant by some suitable mechanism, and redeposited on out-core surfaces which gives rise to the radiation fields of concern.

Subject
Materials, Piping, Nuclear power, Reactors, Walls, Wall shear stress, Coolants, Steam generators, Particulates, Corrosion products, Stress, Shear, Samples
© 1979 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).
1979
Association for Materials Protection and Performance (AMPP)
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