A writ of mandamus issued by the Court of Appeals for the District of Columbia Circuit had res judicata effect in an action before the Court of Federal Claims for breach of the standard contract for spent nuclear fuel storage, because the DC Circuit had statutory jurisdiction, which waived sovereign immunity, and the DC Circuit's decision did not intrude on the CFC's jurisdiction to address the breach claim. At issue was the effect of the DC Circuit's holding the government had an unconditional obligation under the Nuclear Waste Policy Act to begin accepting nuclear waste from utilities by 1998, and the court's order barring the government from defending its failure to meet the deadline under the contract's "Unavoidable Delays" clause (Northern States Power Co. v. Department of Energy 128 F3d 754). The CFC held the DC Circuit's rulings were void because the court lacked jurisdiction to issue the mandamus order without a waiver of sovereign immunity (50 CCF ¶78,653).