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Advanced Systems > CRHVAC > Flashcards

CRHVAC Flashcards

1
Q

LCO 3.7.10 “Control Room Ventilation (CRV) Filtration” requirement

A

2 CRV Filtration trains shall be operable

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2
Q

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

A

Initiate action to implement mitigating actions IMMEDIATELY.

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3
Q

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

A

Suspend core alterations, stop movement of irradiated fuel assemblies, stop movement of cask over the SFP IMMEDIATELY

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4
Q

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

A

Suspend core alterations, stop movement of irradiated fuel assemblies, stop movement of cask over the SFP IMMEDIATELY

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5
Q

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

A

Initiate action to implement mitigating actions IMMEDIATELY.

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6
Q

LCO 3.7.11 “Control Room Ventilation (CRV) Cooling” requirement

A

2 CRV cooling trains shall be operable

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7
Q

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

A

Suspend core alterations, stop movement of irradiated fuel assemblies, stop movement of cask over the SFP IMMEDIATELY

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8
Q

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

A

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

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9
Q

When is CRHVAC recirc mode used

A

When outside air may have smoke or other gas that would make the C.R. uninhabitable

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10
Q

What functions are lost when CRHVAC is in recirc mode

A

C.R. envelope positive pressure.

RIA’s aren’t in the flow path, therefore will not be able to detect adverse radiological conditions.

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11
Q

Whose permission is needed to put CRHVAC in recirc mode

A

Shift Manager or Site Emergency Director

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12
Q

When is CRHVAC purge mode used

A

Used to clear C.R. of smoke or other gases.

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13
Q

What actuates CRHVAC emergency mode

A

Manual - 1 side actuates

Automatic (CHP/CHR) - both sides actuate

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14
Q

How does CRHVAC respond to a loss of D-11A/21A

A

CRHVAC fails to emergency mode.

VC-11/10 trips and will not restart.

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15
Q

How does CRHVAC respond to a loss of Y-10/20

A

Can’t be operated in emergency mode.
Fails to recirc mode.
VC-11/10 trips and will not restart.

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16
Q

Where can V-95/96 be operated from

A

Control Room or locally at C-186A/B (in CRHVAC rooms)

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17
Q

V-95/96 Control Room handswitch positions

A

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.

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18
Q

V-95/96 C-186A/B handswitch positions

A

Off - stops the unit
Remote - normal position
On - starts the unit and aligns dampers for normal mode

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19
Q

V-95/96 filter High DP alarm

A

0.75” H2O

20
Q

VC-10 power supply

A

MCC-25

21
Q

VC-11 power supply

A

MCC-26

22
Q

VC-10/11 cooling water supply

A

Critical Service Water

23
Q

Operation of CV-1655/1666, Condensing Unit VC-11/10 Service Water

A

As temperature increases, valve modulates open to lower condenser temperature and pressure.

24
Q

How does CV-1655/1666, Condensing Unit VC-11/10 Service Water, fail

A

Valves fail open, which causes condenser temperature and pressure to lower to the point of a low suction pressure trip.

25
Q

VC-10/11 handswitch positions

A

Off/Reset - turns unit off, resets load shed logic to allow starting, resets CHP/CHR logic for VC-10/11 (signal stays locked in after CHP/CHR reset)

Auto - Starts VC-10/11 when its associated AHU (V-95/96) starts after a 45 second delay

OVRD-CHP/CHR - override to allow VC-10/11 to start with a CHP/CHR signal

26
Q

What is indicated by the amber trouble light on the VC-10/11 handswitch

A

Shows that the unit has either tripped or is in alarm

27
Q

VC-10/11 trips

A

high discharge pressure
high oil temperature
low suction pressure
low differential oil pressure

28
Q

VC-10/11 alarms

A

Condenser high differential cooling water pressure

High vibrations

29
Q

VH-13, CRHVAC Humidifier - Train A, power supply

A

MCC-79

30
Q

VH-12, CRHVAC Humidifier - Train B, power supply

A

MCC-80

31
Q

VH-12/13 water supply

A

Domestic water

32
Q

VH-12/13 auto trips

A 
V-95/95 shutdown
V-26A/B start (minimize water into the charcoal filters)
CHP/CHR
High water level
High humidity - 90%
33
Q

VF-26A/B pre-filter purpose

A

protects the heater

34
Q

VF-26A/B electric heater purpose and power supply

A

remove moisture to protect the charcoal filters
VHX-26A - MCC-25
VHX-26B - MCC-26

35
Q

HEPA filter high dp alarm

A

2” H2O (1st hepa filter only)

36
Q

Charcoal filter purpose

A

removes iodine

37
Q

Charcoal filter temperature alarm

A

High temp alarm in C.R. at 220 F

Hi Hi local alarm light at 280 F is a positive indication of a fire

38
Q

V-26A/B, emergency fan, power supply

A

V-26A - MCC-25

V-26B - MCC-26

39
Q

Where can V-26A/B be controlled from

A

Control Room handswitch

Locally at C-186A/B (in CRHVAC rooms)

40
Q

V-26A/B Control Room handswitch positions

A

Off - stops fan and repositions dampers
Auto - Fan starts 1 minute after CHP/CHR
On - starts fan and repostions dampers

41
Q

V-26A/B C-186A/B handswitch positions

A

On - starts fan and repositions dampers
Auto - normal
Off - stops fan and repostions dampers

42
Q

V-94, Control Room Purge Exhaust Fan, purpose

A

purge smoke/gas from C.R.

43
Q

V-94, Control Room Purge Exhaust Fan, power supply

A

MCC-79

44
Q

V-94, Control Room Purge Exhaust Fan, trip

A

trips on CHP/CHR (purge mode is blocked)

45
Q

LCO 3.7.10 “Control Room Ventilation (CRV) Filtration” applicability

A

Modes 1-4, during core alterations, movement of irradiated fuel assemblies, and during movement of a cask over the SFP.

46
Q

LCO 3.7.11 “Control Room Ventilation (CRV) Cooling” applicability

A

Modes 1-4, and during core alterations, movement of irradiated fuel assemblies, and movement of a cask in or over the SFP.

Advanced Systems (36 decks)

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