Orders of Succession

A formal, sequential assumption of a position’s authorities and responsibilities, to the extent not otherwise limited by law, by the holder of another specified position as identified in statute, executive order, or other presidential directive, or by relevant Departmental policy, order, or regulation if there is no applicable executive order, other presidential directive, or statute in the event of a vacancy in office or a position holder dies, resigns, or is otherwise unable to perform the functions and duties of that pertinent position.

a. Department of Energy (DOE) Orders of succession are listed in DOE Order (O) 100.1E (or current version), Secretarial Succession, Threat Level Notification,
and Successor Tracking. 

b. National Nuclear Security Administration (NNSA) Succession is listed in NNSA Supplemental Directive (SD) 150.1A, (or current version) Lines of Succession.