At any time prior to the issuance by the Board of its decision in a proceeding the Board, after notice to the participants, may without motion reopen the proceeding and remand to a hearing committee or special master for the reception of further evidence, if the Board has reason to believe that conditions of fact or law have so changed as to require, or that the public interest requires, the reopening of such proceeding.
204 Pa. Code § 89.253