(a) The accumulated contributions without interest of a member who is neither eligible for a service nor disability pension, nor has a vested right to a service pension, shall be refunded upon his withdrawal from service. There shall be a rebuttable presumption that a former member who fails to apply for a withdrawal benefit within five (5) years after the date of withdrawal has waived his right to such benefit.
(b) If a member has a vested right to a service pension and withdraws from service and is not immediately eligible for a service or disability benefit, he may request a refund of his accumulated contributions without interest. Refund of such contributions extinguishes all rights to any benefits under this article.