Radwaste Building HVAC Flashcards
How is smoke removal accomplished in the Radwaste building?
Fire and smoke detectors alarm in the control room; smoke is removed by exhaust AFUs and supplemented by portable smoke ejectors.
State the function of Radwaste building HVAC
1) maintains temps within limits during normal plant operating and shutdown conditions.
2) provide ventilation air to Radwaste building
3) minimize airborne radioactivity release with a negative building pressure
4) monitor and filter exhaust air discharged out the plant vent stack
What components in the GR system vent to the HR system?
1) release path discharges upstream of the AFUs
2) waste gas surge tank relief valve
3) GR compressor pre-filter
4) GR compressor suction filter
5) GR compressor package
What LR system components vent to the HR system?
1) LR system evaporator surface condenser and heater
2) concentrate monitor tanks
3) LR holdup tanks
What happens to the HR system on a loss of IA?
Dampers fail closed and AHUs and AFUs trip on overload
Where does the Radwaste building HVAC system discharge to?
Plant vent
What components makeup the RW control room normal AHU?
Moderate efficiency air filter, chilled water cooling coil, fan, and an electric heater
At what temperature does the rad waste control room duct heater energize?
Supply air temperature less than 75F if the heater air flow is not low and the breaker is closed.
How are the OSA dampers interlocked with the AHUs?
When the fan is running, the damper is open and when the fan is stopped, the damper is closed.
What is required for an OSA AHU air washer pump to start?
A permissive signal from the associated running AHU fan and a signal from the intake temperature controller that the outside air temp is >80F .
What will cause the exhaust normal AFUs to trip?
Receipt of an electrical protection signal
Where does RU-14 sample from?
All exhaust from the rad waste building which will sound an alarm.
What does RU-15 monitor?
Combined exhaust from the waste gas system.
What is the sequence for starting the decon facility HVAC subsystem?
Place the AFU on line first, then the AHU to keep from pressurizing the building.
What happens to the RW building dampers on a loss of NK?
Dampers fail closed and AHUs and AFUs trip on overload.
