To temporarily suspend the duty on certain lead fuel test assemblies.

Directs the Secretary of the Treasury to: (1) liquidate or reliquidate as free of duty any partially assembled lead fuel assembly that was or is imported on March 9, 1990, on September 9, 1990, or before December 31, 1993; and (2) refund any duties paid with respect to such imports if a specified certification is made and submitted to the appropriate customs officer. Describes such an assembly as composed of nuclear fuel rods of zircaloy tubes filled with slightly enriched uranium dioxide pellets.