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The structure of Co21‐xTa2+xB6 (x = 0.18) is refined on the basis of single crystal XRD data and described in detail.

This report deals with technical information that is considered essential for demonstrating the ability of the high-level radioactive waste package to provide "substantially complete containment" of its contents (vitrified waste form or spent light-water reactor fuel) for a period of 300 to 1000 years in a geological repository environment. The discussion is centered around technical considerations of the repository. environment, materials and fabrication processes for the .vaste package components, various degradation modes of the materials of construction of the waste packages, and inspection and monitoring of the waste package during the preclosure and retrievability period, which could begin up to 50 years after initiation of waste emplacement. The emphasis in this report is on metallic materials. However, brief references have been made to other materials such as ceramics, graphite, bonded ceramic-metal systems, and other types of composites. The content of this report was presented to an external peer review panel of nine members at a workshop hc_d at thc Cc,tcr for Nuclear Waste Regulatory Analyses (CNWRA), Southwest Research Institute, San Antonio, q"cx:_s,April 2-4, 1996. The recommendaiions of the peer review panel have been incorporated in this report. There are two companion reports; the second report in the series provides state.of-the-art techniques for uncertainty evaluations. The methods provided in that report can i be used to quantify various types of uncertainties. The third companion report, on the basis of the information provided in lhc first two reports, devclops recommendations tbr the resolution of the issue of ,li "substantially complete containment" of high-level radioactive waste within the waste package, as

No abstract

This report was prepared as an account of work sponsored by an agency of the United States Government. Neither the UnitNl St,.tr< C:ovPrnment nor any agency thereof, or any of their employees, makes any warranty, expressed or implied, or a3sumcg any legal hab!ltty u• r~..>puu>iLility lu• ""Y thi• J pa• ty's use, Ul the resultS uf such use, of any information, apparatus, product or process disclosed in this report, or represents that its use by such third party would not infringe privately owned rights. The views expressed in this report are not necessari ly those of the U.S. Nuclear Regulatory Commission.