HVAC Flashcards
What sends a signal to BOP-ESFAS, which could provide a FBEVAS signal?
RU-145 (Fuel Blg HVAC effluent)
RU-31 (SFP area rad monitor)
On a SIAS signal; what happens to the Fuel Blg HVAC?
The Essential exhaust AFU and dampeners will auto align to take suction from the 100’ and below of the Aux Blg
What will automatically stop the fuel building normal supply and exhaust fans?
FBEVAS
What will close the fuel building normal supply and exhaust dampers?
FBEVAS or lose of IA
Describe the reaction of the essential fuel building exhaust AFU’s to a SIAS and/or a FBEVAS?
SIAS- aligns to aux building
FBEVAS- aligns to fuel building
Both present- SIAS takes priority
What containment HVAC components are affected on a SIAS?
- Containment Normal ACU’s trip
- CEDM normal ACUs trip
- Reactor cavity fans trip
Following a SIAS, what ACU’s inside of containment are sequenced back on?
- CEDM normal ACU’s
- Containment normal ACU’s
What do the four reactor cavity cooling fans prevent?
deterioration of the cement in the reactor cavity
Where is RU-1 located and where does it take a sample from?
Located in the Aux blg and it draws a sample from the 120’ level of containment
How are the HC normal ACU’s fan suction dampeners operated?
Motor operated and they open when the ACU is started
Where are the MSSS vent supply fans controlled from?
Locally with a 3 position switch (stop-auto-start)
What subsystems makeup containment purge?
Refueling purge
Power access purge
What is power access purge used for?
Control pressure in containment by periodically venting to the plant vent stack
What components makeup the power access purge exhaust AFU?
Moderate filter, HEPA, charcoal, HEPA, Fan
When is the refueling purge supply AHU operated?
In modes 5 and 6
What does the heater that is installed upstream of the charcoal filter in the power access purge normal exhaust AFU do?
prevent the charcoal from being damaged by moisture
How does the loss of 125 VDC affect CP?
- Refueling purge outlet dampers fail closed and prevent AHU ops
- Power access purge inlet dampers fail closed adn prevent AHU ops
What are the RU monitors in the aux building HVAC? What do they monitor?
RU-8- Aux Blg vent exh filter inlet
RU-9- Aux Blg Lower level vent exh monitor
RU-10- Aux Building Upper level vent exh monitor
RU-143- Plant vent lower monitor
RU-144- Plant vent higher monitor
What is the max and min temperature in the Aux building?
Max- 104 degrees F
Min0 50 degrees F
What is the min and max temperature in the access control area?
Max- 80 degrees F
Min- 70 degrees F
What do we have to do when less then both trains of aux building exhaust and supply are operating?
Monitor electrical penetration rooms every 8 hours (104 degrees F)
Where can we start the Aux feed pump room ACU’s?
Locally at the MCC (s). (PHA/PHB)
If we lose cooling to the CEDM ACU, what is our limit on RCS temperature?
If RCS temperature is > 300 degrees F and we lose CEDM cooling; we shouldn’t operate them or they could become damaged.
What is the containment pressure and temperature LCO’s?
Temp- 3.6.5
Pressure- 3.6.4
If there is steam in the main steam lines in the MSSS what are the limits on the MSSS exhaust fans?
At least one exhaust fan must be in service.
If only one is in service then, it can only operate like that for 7 days.
What kind of pressure do we maintain in the Aux blg, fuel blg, and RW?
Slight negative pressure
How do we maintain the negative pressure in the RCA buildings?
By starting the exhaust system before the supply.
If we are stopping the Fuel building HVAC, how should we shutdown the equipment?
Shutdown the supply first and then the exhaust to maintain a slight negative pressure.
Why can’t we open the doors on the FB essential AFU’s?
By opening the doors it inops the PREACS and FBEVAS.. If Mx needs the door open for whatever reason we can open them if;
- we are in constant contact with the control room
- The doors remain functional and can be closed on a moments notice.
If we start a FB essential AFU, how long must we let it run before we shut it down?
The AFU needs to be operated for at least 15 minutes. If the fan isn’t allowed to run for 15 minutes then after it is shutdown; it should remain shutdown for 5 minutes before restoring.
What RU-monitors send a CREFAS signal on hi radiation?
RU-37/38.
Control Room Essential Filtration actuation signal
