Except for the Secretary, the responsibilities and authorities conferred in this part may be exercised by persons who have been designated in writing as acting for, or in the temporary capacity of, the following DOE positions: The Local Director of Security; the Manager; the Director, or the General Counsel. The responsibilities and authorities of the Deputy Associate Under Secretary for Environment, Health, Safety and Security may be exercised by persons in senior security-related positions within the Office of Environment, Health, Safety and Security who have been designated in writing as acting for, or in the temporary capacity of, the Deputy Associate Under Secretary for Environment, Health, Safety and Security, with the approval of the Associate Under Secretary for Environment, Health, Safety and Security.