On September 22, 1999 (64 FR 51187), the NRC published a direct final rule amending its regulations to revise the Pacific Sierra Nuclear Associates (PSNA) VSC-24 cask listing within the ``List of Approved Spent Fuel Storage Casks'' to include Amendment No. 1 to the Certificate of Compliance. The direct final rule was to have become effective December 6, 1999, absent significant adverse comments. The NRC is delaying the effective date of this action for 30 days to allow it sufficient time to consider the issues raised by public comment.