10 U.S.C. § 6280 — Availability of funds

Except as provided in subsection (b), amounts appropriated pursuant to a DOE national security authorization^* for operation and maintenance or for plant projects may, when so specified in an appropriations Act, remain available until expended.

Amounts appropriated for program direction pursuant to a DOE national security authorization for a fiscal year shall remain available to be obligated only until the end of that fiscal year.