The waste package design for Yucca Mountain (Nevada, USA) currently consists of a double walled cylindrical container fabricated using the highly corrosion resistant Ni-based Alloy 22 for the outer barrier and Type 316 stainless steel (nuclear grade) for the inner structural vessel. A mailbox-shaped drip shield fabricated primarily using Ti Grade 7 will cover the containers. The environmental degradation of the relevant materials have been extensively studied and modeled for over ten years. This paper reviews the state-of-the-art understanding of the degradation modes of Alloy 22 (N06022) due to its interaction with the predicted in-drift mountain conditions including temperature and types of electrolytes. Subjects such as thermal aging and phase stability, dry oxidation, general and localized corrosion, stress corrosion cracking and hydrogen induced cracking are discussed.

Subject
Barriers, Water, Corrosion resistant alloys, Barrier layers, Nitrates, Seepage, Brines, Localized corrosion, Alloys, Wastes, Relative humidity, Stress corrosion cracking, Microbiologically influenced corrosion
Keywords:
Nuclear Waste Repository, Yucca Mountain Project, N06022, General Corrosion, Localized Corrosion, Stress Corrosion Cracking, Dust Deliquescence
© 2006 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).
2006
Association for Materials Protection and Performance (AMPP)
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