مفاعل نووي
Nuclear reactor response properties such as Temperature coefficient of reactivity and Void coefficient of reactivity usually refer to the thermodynamic and phase-change response of the neutron moderator heat transfer "process" respectively. Reactors whose heat transfer process has the operational property of a negative void coefficient of reactivity are said to possess an "inherent safety" process feature. An operational failure mode could potentially alter the process to render such a reactor unsafe.