PSO Based Optimization of Testing and Maintenance Cost in NPPs

Table 3

Meanings of the notations in (11).

Notation	Meanings
	Yearly cost due to testing
()	Yearly cost due to preventive maintenance
()	Overhaul cost due to replacing a component with a new one
	Yearly cost due to corrective maintenance
	Outage cost due to technique specification (TS)
	Constant cost due to the plant outage
	Average time required to start up NPP after shutdown
	Hourly cost for conducting surveillance test
	Hourly cost for preventive maintenance
	Hourly cost for corrective maintenance
	Hourly cost for loss of production for plant downtime
	The total cost of replacing a component