Section 225.31 - PIA's to which DRC's are added(a) DRC's can be added to the following PIA's when used in computing the following benefits: (1) Tier I PIA used in computing a retirement employee annuity.(2) Overall Minimum PIA used in computing a retirement employee annuity.(3) Survivor Tier I PIA used in computing a widow(er), remarried widow(er) or surviving divorced spouse annuity based on age or disability.(4) Employee RIB PIA used in computing a widow(er), remarried widow(er) or surviving divorced spouse annuity based on age or disability.(5) RLS PIA used in computing the amount of the residual lump-sum payable (as explained in part 234 of this chapter).