The objective of these calculations is to perform intact and degraded mode criticality evaluations of the Department of Energy's (DOE) Fort Saint Vrain (FSV) commercial High Temperature Gas Reactor (HTGR) spent nuclear fuel. This analysis evaluates codisposal in a 5-Defense High-Level Waste (5-DHLW/DOE SNF) Long Waste Package (WP)(CRWMS M&O 2000c, Attachment V), which is to be placed in a potential monitored geologic repository (MGR).