Section 831.808 - Mandatory separation(a) Effective on and after October 17, 1999, the mandatory separation provisions of 5 U.S.C. 8335(b) apply to all nuclear materials couriers in primary and secondary positions. A mandatory separation under 5 U.S.C. 8335(b) is not an adverse action under part 752 of this chapter or a removal action under part 359 of this chapter. Section 831.502 provides the procedures for requesting an exemption from mandatory separation.(b) In the event an employee is separated mandatorily under 5 U.S.C. 8335(b) , or is separated for optional retirement under 5 U.S.C. 8336(c) , and OPM finds that all or part of the minimum service required for entitlement to immediate annuity was in a position which did not meet the requirements of a primary or secondary position and the conditions set forth in this subpart, such separation will be considered erroneous.