As used in this chapter, unless the context requires otherwise:
(1) “Institution” means the institutions designated in ORS 179.321.
(2) “Agency” means:
(a) The Department of Corrections when the institution is a Department of Corrections institution, as defined in ORS 421.005;
(b) The Department of Human Services when the institution is the facility formerly used as the Eastern Oregon Training Center; or
(c) The Oregon Health Authority when the institution is an Oregon State Hospital campus.