5 C.F.R. § 843.314
Amount of survivor annuity where service includes credit for service with a nonappropriated fund instrumentality
(a) The survivor annuity based on service that includes service with a nonappropriated fund instrumentality made creditable by an election under 5 CFR part 847, subpart D, is computed under 5 CFR part 847, subpart F.
(b) The survivor annuity based on service that includes service with a nonappropriated fund instrumentality made creditable by an election under 5 CFR part 847, subpart H, is computed under 5 CFR part 847, subpart I.