Rationale for determining MCC spent fuel acquisitions

The Yucca Mountain Site Characterization Project of the US Department of Energy (DOE) is investigating the suitability of the Topopah Spring Tuff at Yucca Mountain, Nevada, for use as a disposal site for spent nuclear fuel and other high-level waste forms. The performance of the high-level waste forms and the engineered barrier system at the site must be shown to comply with the requirements in 10 CFR 60. Lawrence Livermore National Laboratory (LLNL) has the responsibility for determining the performance of the US commercial reactor spent nuclear fuels under potential repository conditions. Pacific Northwest Laboratory (PNL) performs testing of these highly radioactive materials in support of the LLNL program. This report summarizes the rationale for selecting additional spent fuels that should be acquired to support the LLNL and PNL testing programs. These programs have identified specific attributes that may affect spent fuel behavior in a repository