Section 842.908 - Mandatory separation(a) Effective on and after October 17, 1999, the mandatory separation provisions of 5 U.S.C. 8425 apply to all nuclear materials couriers including those in secondary positions. A mandatory separation under 5 U.S.C. 8425 is not an adverse action under part 752 of this chapter or a removal action under part 359 of this chapter.(b) Exemptions from mandatory separation are subject to the conditions set forth under 5 U.S.C. 8425 . An exemption may be granted at the sole discretion of the head of the employing agency or by the President in accordance with 5 U.S.C. 8425(c) .(c) In the event that an employee is separated mandatorily under 5 U.S.C. 8425 , or is separated for optional retirement under 5 U.S.C. 8412(d) or (e) , and OPM finds that all or part of the minimum service required for entitlement to immediate annuity was in a position that did not meet the requirements of a primary or secondary position and the conditions set forth in this subpart or, if applicable, in part 831 of this chapter, such separation will be considered erroneous.