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High Integrity Can
1.0 Introduction and Scope
The National Spent Nuclear Fuel Program is chartered with facilitating the disposition of
DOE-owned spent nuclear fuel to allow disposal at a geologic repository. This is done
through coordination with the repository program and by assisting DOE Site owners of
SNF with needed information, standardized requirements, packaging approaches, etc.
The high integrity can concept grew out of the need to manage a number of
miscellaneous spent nuclear fuel items, fuels that represent very small lots, or fuel pieces
that have been sectioned, damaged, or otherwise degraded. Sufficient characterization of
such items to meet all repository criteria has been judged to be quite expensive and in
come cases is not feasible.
The High Integrity Can (HIC) will be manufactured to provide a substitute or barrier
enhancement for normal fuel geometry and cladding. The can would be nested inside the
DOE standardized canister which is designed to interface with the repository waste
package. The HIC approach may provide the following benefits over typical canning
approaches for DOE SNF.
" It allows ready calculation and management of criticality issues for miscellaneous
pieces and parts of spent fuel items.
" It segments and further isolates damaged or otherwise problem materials from normal
SNF in the repository package.
" It provides a very long term corrosion barrier
" It provides an extra internal pressure barrier for particulates, gaseous fission products,
hydrogen, and water vapor.
" It delays any potential release of fission products to the repository environment.
" It maintains an additional level of fuel geometry control during design basis
accidents, rock-fall, and seismic events.
" When seal welded, it could provide the additional containment required for shipments
involving plutonium content in excess of 20 Ci. (10 CFR 71.63.b) if integrated with
an appropriate cask design.
Long term corrosion protection is central to the HIC concept. The material selected for
the HIC (Hastelloy C-22) has undergone extensive testing for repository service. The
most severe theoretical interactions between iron, repository water containing chlorides
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Shaber, E.L. High Integrity Can Design Interfaces, report, August 1, 1998; Idaho Falls, Idaho. (https://digital.library.unt.edu/ark:/67531/metadc690602/m1/6/: accessed May 26, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.