HI-STORM (Holtec International Storage Module) is Holtec International’s Multi-Purpose Canister (MPC) system for the dry storage of used nuclear fuel. The HI-STORM system consists of interchangeable sealed metallic MPCs which contain the used fuel; a vertically ventilated storage overpack or underground Vertical Ventilated Module (VVM), which contains the MPC during storage; and an on-site transfer cask, HI-TRAC, which contains the MPC during loading, unloading, and transfer operations.
