CRHVAC Flashcards
LCO 3.7.10 “Control Room Ventilation (CRV) Filtration” requirement
2 CRV Filtration trains shall be operable
LCO 3.7.10 “Control Room Ventilation (CRV) Filtration” required actions if 1 or more CRV Filtration trains inoperable due to inoperable C.R. Envelope boundary in Modes 1-4
Initiate action to implement mitigating actions IMMEDIATELY.
LCO 3.7.10 “Control Room Ventilation (CRV) Filtration” required actions if 2 CRV Filtration trains inoperable during core alterations, movement of irradiated fuel assemblies, or during movement of a cask over the SFP
Suspend core alterations, stop movement of irradiated fuel assemblies, stop movement of cask over the SFP IMMEDIATELY
LCO 3.7.10 “Control Room Ventilation (CRV) Filtration” required actions if 1 or more CRV Filtration trains inoperable due to inoperable C.R. Envelope boundary during core alterations, movement of irradiated fuel assemblies, or during movement of a cask over the SFP
Suspend core alterations, stop movement of irradiated fuel assemblies, stop movement of cask over the SFP IMMEDIATELY
LCO 3.7.10 “Control Room Ventilation (CRV) Filtration” required actions if 2 CRV Filtration trains inoperable for something other than C.R. Envelope boundary in modes 1-4
Initiate action to implement mitigating actions IMMEDIATELY.
LCO 3.7.11 “Control Room Ventilation (CRV) Cooling” requirement
2 CRV cooling trains shall be operable
LCO 3.7.11 “Control Room Ventilation (CRV) Cooling” required actions if 2 CRV Cooling trains inoperable during core alterations, movement of irradiated fuel assemblies, or during movement of a cask over the SFP
Suspend core alterations, stop movement of irradiated fuel assemblies, stop movement of cask over the SFP IMMEDIATELY
LCO 3.7.11 “Control Room Ventilation (CRV) Cooling” required actions if One CRV Cooling train inoperable and completion time not met during core alterations, movement of irradiated fuel assemblies, or during movement of a cask over the SFP
Place operable CRV cooling train in operation IMMEDIATELY
or
Suspend core alterations, stop movement of irradiated fuel assemblies, andstop movement of cask over the SFP IMMEDIATELY
When is CRHVAC recirc mode used
When outside air may have smoke or other gas that would make the C.R. uninhabitable
What functions are lost when CRHVAC is in recirc mode
C.R. envelope positive pressure.
RIA’s aren’t in the flow path, therefore will not be able to detect adverse radiological conditions.
Whose permission is needed to put CRHVAC in recirc mode
Shift Manager or Site Emergency Director
When is CRHVAC purge mode used
Used to clear C.R. of smoke or other gases.
What actuates CRHVAC emergency mode
Manual - 1 side actuates
Automatic (CHP/CHR) - both sides actuate
How does CRHVAC respond to a loss of D-11A/21A
CRHVAC fails to emergency mode.
VC-11/10 trips and will not restart.
How does CRHVAC respond to a loss of Y-10/20
Can’t be operated in emergency mode.
Fails to recirc mode.
VC-11/10 trips and will not restart.
Where can V-95/96 be operated from
Control Room or locally at C-186A/B (in CRHVAC rooms)
V-95/96 Control Room handswitch positions
On - starts unit and aligns the dampers for normal mode.
Auto - Starts unit on CHP/CHR after a 1 minute time delay.
Off/Reset - Secures unit and aligns dampers. Resets load shed circuitry if fan was not started by sequencer.
V-95/96 C-186A/B handswitch positions
Off - stops the unit
Remote - normal position
On - starts the unit and aligns dampers for normal mode
V-95/96 filter High DP alarm
0.75” H2O
VC-10 power supply
MCC-25
VC-11 power supply
MCC-26
VC-10/11 cooling water supply
Critical Service Water
Operation of CV-1655/1666, Condensing Unit VC-11/10 Service Water
As temperature increases, valve modulates open to lower condenser temperature and pressure.
How does CV-1655/1666, Condensing Unit VC-11/10 Service Water, fail
Valves fail open, which causes condenser temperature and pressure to lower to the point of a low suction pressure trip.
