(1) The director may pay a member eligible to receive a retirement allowance or the member's beneficiary a lump sum payment in lieu of a monthly benefit if the initial monthly benefit would be less than one hundred dollars. The one hundred dollar limit shall be increased annually as determined by the director. The lump sum payment shall be the actuarial equivalent of the monthly benefit.

(2) Persons covered under the provisions of subsection (1) of this section may upon returning to member status reinstate all previous service by depositing the lump sum payment received, with interest as computed by the director, within two years of returning to service or prior to retiring again, whichever comes first. In computing the amount due, the director shall exclude the accumulated value of the normal payments the member would have received while in beneficiary status if the lump sum payment had not occurred.

(3) Any member who receives a settlement under this section is deemed to be retired from this system.