Oregon Revised Statutes Public Officers and Employees § 238A.115

(1) Except as provided in subsection (2) of this section, a member of the pension program becomes vested in the pension program on the earliest of the following dates:

(2) If on the date that a person becomes an active member the person has already reached the normal retirement age for the person under ORS 238A.160, the person is vested in the pension program on that date.

(3) If a member of the pension program who is not vested in the pension program performs fewer than 600 hours of service in each of five consecutive calendar years, hours of service performed before the first calendar year of the period of five consecutive calendar years shall be disregarded for purposes of determining whether the member is vested under subsection (1)(a) of this section.

(4) Solely for purposes of determining whether a member is vested under this section, hours of service include creditable service, as defined in ORS 238.005, performed by the person before the person became an eligible employee, as long as the membership of the person under ORS chapter 238 has not been terminated under the provisions of ORS 238.095 on the date the person becomes an eligible employee.