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LOIT Questions > Circulating Water > Flashcards

Circulating Water Flashcards

1
Q

Which Circ Water pump has the highest full load amp rating? Why?

A

2B (full load amp rating of 225 amps vs 208 amps that the other CW pumps have. This due to CW pmp 2B having a 7000HP motor vs. the 5000HP motors on the rest of the CW pumps).

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2
Q

What is the power supply for each CW pump?

A

NAN-S01 for A/B CW pumps, NAN-S02 for C/D CW pumps.

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3
Q

What interlocks are associated with the water box outlet valves?

A

The “water box full permissive” must be met to open the outlet valves (pressure switch upstream of the valve), and the valve must be open to start CW pumps in same CW loop.

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4
Q

What interlock can be bypassed from B07?

A

The CW start interlock associated with respective waterbox outlet valve being open can be bypassed with a push button on B07. However there is no procedural guidance to use this.

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5
Q

Where can PW return be aligned?

A

Normally PW return is aligned to the CW return to the cooling towers, but can be alternately aligned to only the #2 CW tower.

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6
Q

The CW system is in normal operation with all pumps running, and CWN-HV-11 open when the ‘A’ CW pump is secured. After all automatic operations are complete, what is the lineup of the CW system?

A

The remaining CW pumps are all running with discharge valves 100% open, and CWN-HV-11 is still open.

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7
Q

What supplies cooling to the CW pumps?

A

Turbine Cooling water. (TC)

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8
Q

What conditions must be met to start a CW pump?

A

Discharge valve shut, and same side water box outlet valve open or “Condenser Outlet Valve Interlock Override” depressed.

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9
Q

The Circulating Water system is in a normal lineup with all four pumps running.
The CO places CWN-HS-1A for the ‘A’ CW pump to STOP and releases it.
What is the expected response of CWN-P01 and its discharge valve CWN-UV-5?
A. ‘A’ CW pump will stop, and then its discharge valve will close to 8%.
B. ‘A’ CW pump will stop, and then its discharge valve will close to 44%.
C. CWN-UV-5 will close to 8%, and then ‘A’ CW pump will stop.
D. CWN-UV-5 will close to 44%, and then ‘A’ CW pump will stop.

A

C

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10
Q

The Circulating Water system is in a normal lineup with all four pumps running.
The CO placed CWN-HV-11 to CLOSE. Afterward, the CO places
CWN-HS-1A for the ‘A’ CW pump to STOP and releases it.
What is the expected response of the ‘B’ CW pump discharge valve CWN-UV-6?
A. After a two minute delay, CWN-UV-6 will close to 44% open.
B. CWN-UV-6 will close to 44% after CWN-P01A stops.
C. CWN-UV-6 will close to 44% as soon as the switch is released.
D. CWN-UV-6 will remain 100% open.

A

B

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11
Q

The Circulating Water system is in a normal lineup with all four pumps running.
CWN-HS-11 is in AUTO.
The CO places CWN-HS-1A for the ‘A’ CW pump to STOP and releases it.
What is the expected response of the ‘B’ CW pump discharge valve CWN-UV-6?
A. After a two minute delay, CWN-UV-6 will close to 44% open.
B. CWN-UV-6 will close to 44% after CWN-P01A stops.
C. CWN-UV-6 will close to 44% as soon as the switch is released.
D. CWN-UV-6 will remain 100% open.

A

D

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12
Q

Unit 1 is in Mode 3 preparing for reactor startup.
CWN-HV-11 is closed. All Circulating Water Pump discharge isolation valves are closed, and all pumps are off. The CW canal is filled to 22.5 feet.
The CO takes CWN-HS-1A for CWN-P01A to START. What is the expected response of the pump and its discharge valve CWN-UV-5?
A. Pump starts, and then the discharge valve opens to 100%
B. Pump starts, and then the discharge valve opens to 44%
C. Discharge valve opens to 100%, and then the pump starts
D. Discharge valve opens to 44%, and then the pump starts

A

B

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13
Q

What is the stroke time for the CW pump discharge valves? Main Condenser Inlet and Outlet isolations?

A
  • 30 seconds for the CW pump discharge valves.

- 60 seconds for the Main Condenser Inlet and Outlet Isolation Valves.

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14
Q 
What is the power supply for the MOVs in the CW system?
A. NG
B. NK
C. NH
D. PH
A

C. NH (Non-Class 480 V MCC’s)

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15
Q

List the conditions required for a CW pump to start upon taking its associated handswitch to “START”.

A

The associated discharge valve is fully closed
-and-
Either the same flow train condenser outlet valve is open
-or-
the CONDENSER OUTLET VALVE INTERLOCK OVERRIDE pushbutton is depressed.

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16
Q

How many CW pumps can you run with one Cooling Tower isolated? With two Cooling Towers isolated?

A

No more than 2 CW pumps with one tower isolated, and no more than 1 CW pump with two towers isolated.

17
Q

Discuss electrical plant limitations when starting a CW pump.

A
  • Starting a CW pump with DGs from any unit paralleled to the same S/U Transformer may result in damage to the DGs.
  • Starting a CW pump while any PK battery is disconnected from its respective bus may result in an interruption of power to a PN distribution panel. The drop in Voltage to the NAN-S01/S02 bus, due to the pump start, may cause the inverter supplying the PN D-panel to shutdown due to low charger output voltage.
18
Q

Cooling Tower #1 fan CWN-A01C has tripped on high vibration.
This is indicated by which of the following?
A. Bright Green light on the STOP pushbutton for CWN-A01C on B07
B. Bright Green light on the breaker for CWN-A01C
C. Blue light on the STOP pushbutton for CWN-A01C on B07
D. Blue light on the breaker for CWN-A01C

A

D

19
Q

Cooling Tower #3 fan CWN-A03F has tripped on high vibration.
The condition that caused the trip has not been fixed.
Which of the following statements is true?
A. The trip will reset if the fan is started from the control room. If started, the fan will trip after thirty seconds.
B. The trip will reset if the fan is started from the control room. If started, the fan will trip immediately.
C. The trip must be reset locally at the breaker. If started, the fan will trip after thirty seconds.
D. The trip must be reset locally at the breaker. If started, the fan will trip immediately.

A

C

20
Q

What does the push button CIRCULATING WTR PUMP A EMERGENCY TRIP do and where is it located?

A

Each pump is provided with a pushbutton on B07 and at the switchgear that, when pressed, will trip the associated pump’s circuit breaker and send a close signal to its discharge valve. This feature bypasses the valve logic and is used when the pump is required to be tripped immediately.

21
Q

The jog control switches are __(1)__ during CW pump/valve shutdown sequencing but __(2)__ interrupt the normal opening sequence if placed in the __(3)__ position

A

(1) ineffective
(2) WILL
(3) JOG CLOSE

LOIT Questions (86 decks)

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