10 C.F.R. § 205.384
The Department will communicate the contents of an emergency order to the entities subject to the order, utilizing the most expedient form or forms of communication under the circumstances. The Department will attempt to conduct communication of emergency orders in alignment with the existing Emergency Support Function No. 12 structure and established emergency management procedures under the National Response Framework by relying on existing coordinating bodies, such as the ESCC and the E-ISAC, and, recognizing the existence of established crisis communication procedures, any other form or forms of communication most expedient under the particular circumstances. To the extent practicable under the particular circumstances, efforts will be made to declassify eligible information to ensure maximum distribution.
10 C.F.R. §205.384