10 C.F.R. § 503.7
State approval—general requirement for new powerplants
(a) Where approvals by the appropriate State regulatory authority are required prior to the construction or use of a new powerplant, a petition for an exemption for consideration by OFE may be submitted to OFE prior to obtaining such approvals from the State regulatory authority.
(b) An exemption granted for a powerplant shall not become effective until an adequate demonstration has been made to OFE that all applicable approvals required by the State regulatory authorities have been obtained.