List of Approved Spent Fuel Storage Casks: Holtec International HI-STORM Underground Maximum Capacity Canister Storage System, Certificate of Compliance No. 1040

The U.S. Nuclear Regulatory Commission (NRC) is amending its spent fuel storage regulations by adding the Holtec International HI- STORM Underground Maximum Capacity (UMAX) Canister Storage System, Certificate of Compliance (CoC) No. 1040, to the "List of approved spent fuel storage casks." Holtec International intends to provide an underground storage option compatible with the Holtec International HI- STORM FLOOD/WIND (FW) System (CoC No. 1032). The HI-STORM UMAX Canister Storage System stores a hermetically sealed canister containing spent nuclear fuel in an in-ground vertical ventilated module. The HI-STORM UMAX Canister Storage System is designed to provide long-term underground storage of loaded multi-purpose canisters previously certified for storage in CoC No. 1032.