Inspection policies for stand-by systems
Thomas, L. C.
Jacobs, Patricia A.
Gaver, Donald Paul
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An auxiliary service unit is normally idle, or in cold standby. If a demand for the unit's service occurs, the unit must be available to satisfy it, or else "catastrophe" occurs. Policies for periodic inspection and maintenance of such a unit are derived in this paper that maximize the expected time until a catastrophe occurs. The policies recognize that inspection, maintenance, and repair periods are of non-zero duration, during which the unit is vulnerable. They also account for the possibility of hazardous inspection that may damage the unit, and various forms of imperfect repair. Important examples occur in the nuclear power industry: a unit may be a pump, or emergency diesel generator, and a demand may be caused by an initiating event such as pipe break or loss of off site power; "catastrophe" equates to loss-of coolant accident or melt down. Other examples occur in the military, and in emergency services to hospitals.
NPS Report NumberNPS55-84-004
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