The U.S. Nuclear Regulatory Commission (NRC) is withdrawing a direct final rule that would have revised its spent fuel storage regulations to include Amendment No. 3 to Certificate of Compliance (CoC) No. 1031, NAC International, Inc. (NAC) Modular Advanced Generation Nuclear All-purpose Storage (MAGNASTOR[supreg]) System listing within the "List of Approved Spent Fuel Storage Casks." The NRC is taking this action because it has received a significant adverse comment for the vendor of MAGNASTOR[supreg] in response to a companion proposed rule which was concurrently published with the direct final rule.