PSO Based Optimization of Testing and Maintenance Cost in NPPs

Table 2

Meanings of the notations in (6).

Notation	Meanings
	Unavailability caused by testing
	Unavailability caused by preventive maintenance
	Unavailability caused by corrective maintenance
	The rate of testing events
	The rate of preventive maintenance events
	The rate of corrective maintenance events
	Mean time of testing
	Mean time of preventive maintenance
	Mean downtime of corrective maintenance
	Fraction of the total time t with the component down
	Fraction of the total time with the component down