Rolls-Royce 1004227 - Manual (Page 69)

EPRI Proprietary Licensed Material
C-1
C
RAM TERMS AND DEFINITIONS
Term Definition
Availability (%) (Avail)
100 1
•
+
− ⎟⎟
⎠
⎞
⎜⎜
⎝
⎛
Hours Period Unit
Hours Outage Scheduled Hours Outage Forced
where Scheduled Outage Hours = Maintenance
Unscheduled Outage Hours + Maintenance
Scheduled Outage Hours
Reliability (%) (Reliab)
100 1
•
⎟⎟
⎠
⎞
⎜⎜
⎝
⎛
−
Hours Period Unit
Hours Outage Forced
Forced Outage Factor (%) (FOF)
100
•
⎟⎟
⎠
⎞
⎜⎜
⎝
⎛
Hours Period Unit
Hours Outage Forced
Scheduled Maintenance Factor (%)
100
•
⎟⎟
⎠
⎞
⎜⎜
⎝
⎛
Hours Period Unit
Hours Outage Schedule enance int Ma
Unscheduled Maintenance Factor (%)
100 •
⎟⎟
⎠
⎞
⎜⎜
⎝
⎛
Hours Period Unit
Hours Outage Unschedule enance int Ma
Service Factor (%) (SF)
100
•
⎟⎟
⎠
⎞
⎜⎜
⎝
⎛
Hours Period Unit
Hours Service
Starting Reliability (%) (SR)
100
•
⎟⎟
⎠
⎞
⎜⎜
⎝
⎛
Starts Attempted of Number
Starts Successful of Number
Service Hours per Start (SH/Start)
⎟⎟
⎠
⎞
⎜⎜
⎝
⎛
Starts Successful
Hours Service
Average Load
⎟⎟
⎠
⎞
⎜⎜
⎝
⎛
Hours Service
Generated Hours Megawatt Gross
Mean Time Between Failure (MTBF)
⎟⎟
⎠
⎞
⎜⎜
⎝
⎛
Operation of State a from Trips
Hours Service
Mean Time To Repair (MTTR)
⎟⎟
⎠
⎞
⎜⎜
⎝
⎛
Operation of State a from Trips
Trips from sulting Re Hours Outage
Mission (Running) Reliability e
- λt
where
λ = Failure Rate and
t = Mission Time (SH/Start)