| Summary: | This is a progress report covering work through July 2010 under a Sandia-MIT contract
dealing with design and siting/licensing criteria for deep borehole disposal of spent nuclear
fuel or its separated constituents.
The principal focus is on conceptual design of a m ultilayer plug for our reference case
borehole. It is similar to configurations recommended earlier by Swedish and Russian
specialists.
A secondary set of contributions update previous work in the areas such as multi-branch
borehole configurations, use of cast iron canister inserts to resist crushing, and prospects for
faster drilling.
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