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C-1
C
RAM TERMS AND DEFINITIONS
Term Definition
Availability (%) (Avail)
1001 •
+
−
⎟
⎟
⎠
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⎜
⎜
⎝
⎛
HoursPeriodUnit
HoursOutageScheduledHoursOutageForced
where Scheduled Outage Hours = Maintenance
Unscheduled Outage Hours + Maintenance
Scheduled Outage Hours
Reliability (%) (Reliab)
1001 •
⎟
⎟
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⎜
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⎝
⎛
−
HoursPeriodUnit
HoursOutageForced
Forced Outage Factor (%) (FOF)
100•
⎟
⎟
⎠
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⎝
⎛
HoursPeriodUnit
HoursOutageForced
Scheduled Maintenance Factor (%)
100•
⎟
⎟
⎠
⎞
⎜
⎜
⎝
⎛
HoursPeriodUnit
HoursOutageScheduleenanceintMa
Unscheduled Maintenance Factor (%)
100•
⎟
⎟
⎠
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⎝
⎛
HoursPeriodUnit
HoursOutageUnscheduleenanceintMa
Service Factor (%) (SF)
100•
⎟
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⎝
⎛
HoursPeriodUnit
HoursService
Starting Reliability (%) (SR)
100•
⎟
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StartsAttemptedofNumber
StartsSuccessfulofNumber
Service Hours per Start (SH/Start)
⎟
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⎛
StartsSuccessful
HoursService
Average Load
⎟
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⎛
HoursService
GeneratedHoursMegawattGross
Mean Time Between Failure (MTBF)
⎟
⎟
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⎝
⎛
OperationofStateafromTrips
HoursService
Mean Time To Repair (MTTR)
⎟
⎟
⎠
⎞
⎜
⎜
⎝
⎛
OperationofStateafromTrips
TripsfromsultingReHoursOutage
Mission (Running) Reliability
e
-λt
where λ = Failure Rate and
t = Mission Time (SH/Start)