In this chapter, the following terms have the meanings indicated. Terms Defined. “Adverse job action” means a disruption to the normal operational order of the institution by concerted action or inaction of an institution's employees. “Disturbance” means a situation which disrupts the normal operational order of an institution, and for which the assistance of additional off-duty staff may be required. “Division” means Division of Correction. “Major emergency” means a situation occurring within a facility or on surrounding State property under the jurisdiction of the Division requiring the deployment of resources internal or external to save lives, protect property and public safety, or to avert or lessen the severity of the situation. An emergency condition exists if the situation poses a severe threat to maintaining the desired level of security and safety of those inside. “Maximum security” means the second highest security level which provides secure housing for an inmate who: Poses a high risk of violence; Is a significant escape risk; Has a history of serious institutional disciplinary problems; or Is likely to have serious disciplinary problems. “Medium security” means the third highest security level which provides housing for an inmate who: Poses some risk of violence; Is a moderate escape risk; or Has a limited history of institutional disciplinary problems. “Minimum security” means the next to lowest security level which provides housing for an inmate who: Poses less risk of violence; Poses less risk of escape; or Has a minimal history of disciplinary problems. “Perimeter” means the wall or fence surrounding an institution. “Prerelease security” means the lowest security level which provides housing for an inmate who: Presents the least risk of violence; Presents the least risk of escape; and Has a record of satisfactory institutional behavior. “Security”means an institution's physical features which help control inmate behavior and prevent escape. “Super maximum security” means the highest security level. A super maximum security institution provides secure housing within a secure perimeter. Features include single-celling, extremely limited institutional movement, constant observation, and limited inmate-to-staff and inmate-to-inmate contact to control the behavior of an inmate who has demonstrated an inability to be housed in an institution of lesser security.