5 C.F.R. § 1201.118
Regardless of any other provision of this part, the Board may at any time reopen any appeal in which it has issued a final order or in which an initial decision has become the Board's final decision by operation of law. The Board will exercise its discretion to reopen an appeal only in unusual or extraordinary circumstances and generally within a short period of time after the decision becomes final. The parties have no right to request reopening and no right to a response from the Board on a request for reopening. Any response to a request for reopening from the Office of the Clerk of the Board does not constitute a final order or decision of the Board, and thus is not subject to judicial review under 5 U.S.C. 7703 or § 1201.120 .
5 C.F.R. §1201.118