IA/SA Flashcards
_____supplies _____.
Service air supplies instrument air.
Power supplies of SAC
1A SAC bus 143
1B SAC bus 144
2A SAC bus 243
2B SAC bus 244
Lockout devices are located on the breaker for each SAC. Actuated by _______
UV
Phase OC
Ground OC
Normally 2 SAC in operation, one lead loads ____ unloads____. One lag loads ____ unloads_____.
113 psig
119 psig
107 psig
116 psig
SA header pressure is normally _____ and IA header pressure is normally ______.
115#
110#
Phase A isolation effects on IA:
- Closes IA 065 (A train)
- Closes IA 066 (B train)
- Letdown isolates
- Excess letdown isolates
- PZR level will increase
- PZR sprays have no air to operate
(PZR pressure will increase) - All AOVs in containment go to failed position
- PZR PORVs lose air to operate
(Use air accumulators)
What is preferred location for starting and stopping SAC?
Local
IA dryers are automatically bypassed at _____
90 psig
Order of components from SAC to IA dryers
SAC to SA receiver to IA dryers to IA receivers to IA header
SA headers come off SA receivers
Are SA or IA required for safe shutdown?
No
List the components in order between a station air compressor and the Instrument Air Dryers.
Aftercoolers, Moisture Separators, Station Air Receivers.
Where do the SAC pressure switches sense pressure?
At the SAC discharge piping.
List the components in order starting with the IA dryer prefilters and ending with a component that uses IA.
Prefilters, dryers, afterfilters, IA receivers, piping,
What components can be controlled from the MCR associated with the RSH air system?
Both RSH Compressors via RSH Supervisory
SAC Trips (that feed SAC trip alarm)
Phase A or C overcurrent actuates 86 lockout relay Ground overcurrent actuates 86 lockout relay Bus undervoltage actuates 86 lockout relay Loss of power to control cabinet
