20 CFR § 261.2 - Conditions for reopening.
A final decision may be reopened:
(a) Within 12 months of the date of the notice of such decision, for any reason;
(b) Within four years of the date of the notice of such decision, if there is new and material evidence or there was adjudicative error not consistent with the evidence of record at the time of adjudication; or
(c) At any time if:
(1) The decision was obtained by fraud or similar fault;
(3) A person previously determined to be dead on whose earnings record a survivor annuity is based is found to be alive;
(4) A claim was denied because of the absence of proof of death of the employee, and the death is later established:
(i) By reason of an unexplained absence from his or her residence for a period of 7 years; or
(ii) By location or identification of his or her body;
(5) The Social Security Administration has awarded duplicate benefits on the same record of compensation;
(i) To enter items transferred by the Social Security Administration which were credited under the Social Security Act when they should have been credited to the employee's railroad retirement compensation record; or
(ii) To correct an error made in the allocation of earnings to an individual which, if properly allocated, would have given him or her an insured status at the time of the decision and the evidence of these earnings was in the possession of the Railroad Retirement Board or the Social Security Administration at the time of the decision;
(7) The decision is wholly or partially unfavorable to a party, but only to correct clerical error or an error that appears on the face of the evidence that was considered when the determination or decision was made;
(8) The decision found the claimant entitled to an annuity or to a lump sum payment based on the earnings record of a deceased person, and it is later established that:
(ii) If the claimant was subject to the juvenile justice system, he or she was found by a court of competent jurisdiction to have intentionally caused that person's death by committing an act which, if committed by an adult, would have been considered a felony or an act in the nature of a felony;
(9) The claimant shows that it is to his or her advantage to select a later annuity beginning date and refunds, by cash payment or setoff, past payments applying to the period prior to the later beginning date, subject, however, to the provisions of subpart D of part 217 and § 218.9 of this chapter;
(10) The decision is incorrect because of a failure to apply a reduction, or the proper reduction, to the tier I component of an annuity, but the Board shall apply the reduction only for the months following the month the Board first takes corrective action.
(d) Revision of the amount or payment of a separation allowance lump sum amount pursuant to section 6(e) of the Railroad Retirement Act is limited to 60 days from the date of notification of the award of the separation allowance lump sum payment.