List of Approved Spent Fuel Storage Casks: Holtec International HI-STORM UMAX Canister Storage System, Certificate of Compliance No. 1040, Amendment No. 4

The U.S. Nuclear Regulatory Commission (NRC) is confirming the effective date of January 25, 2021, for the direct final rule that was published in the Federal Register on November 9, 2020. This direct final rule amended the Holtec International HI-STORM UMAX Canister Storage System listing in the "List of approved spent fuel storage casks" to include Amendment No. 4 to Certificate of Compliance No. 1040. Amendment No. 4 revises the certificate of compliance to update the technical specifications for radiation protection regarding the dose rate limit for the vertical ventilated module lid, update the technical specifications for the vent blockage limiting condition for operation, and add a Type 1 version of multi-purpose canister MPC-37.