Whether the federal district court had subject-matter jurisdiction over the constitutional challenge.
Holding
Yes. The plaintiffs' substantial constitutional claims against the Nuclear Regulatory Commission supported federal-question jurisdiction under 28 U.S.C. § 1331, even though the complaint had invoked § 1337.
Reasoning
The Court concluded that the complaint was best read as alleging a direct Fifth Amendment claim against the NRC, the federal agency administering the allegedly unconstitutional statutory scheme. The plaintiffs did not merely anticipate that Duke might raise Price-Anderson as a defense to a state-law tort claim; they sought to challenge the constitutionality of federal governmental action before an accident occurred.
A federal claim supplies § 1331 jurisdiction unless it is so insubstantial, implausible, or plainly foreclosed that it fails to present a federal controversy. The plaintiffs' due process and takings theories were at least colorable under prior decisions recognizing that courts may furnish remedies for constitutional violations. The Court therefore did not need to decide whether those theories ultimately stated a cause of action on which relief could be granted.
The Court also declined to decide whether Duke itself was a proper party. Jurisdiction over the claims against the NRC was sufficient, and Duke's presence did not materially affect the Court's ability to resolve the constitutional issues or grant the requested relief.