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AF, SC, SGB/D, CD Demins > AF > Flashcards

AF Flashcards

0
Q

Where does AFN take suction from in shutdown conditions?

A

CST

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1
Q

What is the purpose of the aux feed system?

A

Provides sufficient reserve of feed water to permit the plant to operate in hot standby for 8 hours to the point where SRC can be placed in operation.

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2
Q

Where does AFN discharge to during shutdown conditions?

A

Fills the SGs through the main feed downcomer control valves or the control valve bypass valves.

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3
Q

Where does the recirc flow from AFN discharge?

A

Flow returns to the CST no matter where it’s suction was taken.

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4
Q

What is the backup water source for all AFW pumps?

A

RMWT

Must be manually aligned

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5
Q

What provides room cooling for the I essential pump rooms during normal standby operation?

A

Aux building normal AHUs

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6
Q

What system provides electrical control power for AFA?

A

PK class 125 Vdc

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7
Q

What pump is used during hydrazine and ammonia additions to the secondary?

A

AFN

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8
Q

What is the power source for AFN.

A

PBA

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9
Q

What is the power source for AFB?

A

PBB

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10
Q

What supplies power to all the B train valves?

A

PH

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11
Q

What supplies the motive force for AFA

A

Main steam

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12
Q

What provides the motive force for overspeed trip testing of AFA?

A

Aux steam

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13
Q

What will automatically occur if one aux feed pump room experiences flooding?

A

The air inlet and outlet dampers will close to prevent flooding in both rooms

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14
Q

What are the two sources of control power for AFN?

A

PK and “A”train class battery charger

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15
Q

Where can AFN be controlled from?

A

Locally at the breaker on PBA-S03

Control room

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16
Q

Where does the suction of AFN tap into the CST?

A

Same level as the other AF pumps

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17
Q

What is unique about the hv1 and hv4 and their piping connection to the CST?

A

Between the CST and valves the piping is class (seismically rated) downstream of the valves until the AFN pump is non class.

18
Q

What is the normal position of HV1 & HV4?

A

They are normally closed for seismic considerations

19
Q

Where can an 86 lockout on the AFN pump be reset?

A

Either locally at the breaker or from the control room

20
Q

How is AFB pump cooled and lubricated?

A

It’s provides its own bearing lubrication using dipper rings that throw oil on the bearings.
The lube oil is cooled via two oil coolers that use a slipstream from the first stage pump discharge.

21
Q

Where can and 86 lockout on AFB be reset from?

A

Locally at the breaker or control room.

22
Q

Where is AFB located?

A

81’ of MSSS in a separate room.

23
Q

How is AFA lunricated?

A

It is provided with its own lube oil system. The turbine shaft is coupled with a LO pump that supplies oil to the pumps and turbine governor actuator.

24
Q

What provides cooling to the AFA pump?

A

It provides it’s own cooling water to the LO cooler from the first stage of the pump.

25
Q

What drives the governor actuator?

A

It’s is driven by the same worm gear that drives the LO pump.

26
Q

Under what conditions do we use the AFA pump

A

Blackout

27
Q

Where is steam for AFA provided from?

A

Either SG, upstream of the MSIVs.

28
Q

What can be done to minimize radiological release if one SG has a tube leak and AFA is required?

A

The steam supply for AFA can be switched to the non leaking SG.

29
Q

Where is AFA located?

A

81’ of MSSS in a separate seismic category 1 room.

30
Q

What is the purpose of the AFA turbine trip and throttle valve?

A

Acts as a trip valve during operation. A spring loaded mechanism provides closing force when the valve is tripped and the stem is unmatched from the motor actuator.

31
Q

How can the AFA overspeed trip mechanism be reset when it has tripped due to mechanical overspeed?

A

The NLO will be called upon to reset the valve locally

32
Q

How can the AFA overspeed trip mechanism be reset when it has tripped via pushbutton?

A

The trip can be reset at the control room via hand switch because the mechanical linkage connected to the governor has not changed positions.

33
Q

Where can the manual electrical trip be initiated from?

A

Control room,
remote shutdown panel “a”
and local turbine control panel

34
Q

What is the purpose of the AFW flow regulating valves and where are they located?

A

Controls flow of water to the SGs, located on the discharge piping in the AFW pump rooms

35
Q

What is the purpose and location of the AFW flow isolation valves?

A

Located on the discharge side of the AFW pumps, downstream of the regulating valves and in the associated pump room.

36
Q

What is the power source for the motor operated valves for AFA?

A

PK

37
Q

What is the power source for the motor operated valves on AFB and AFN?

A

PH

38
Q

What feature has been installed in the AFW isolation valve bonnets to prevent them from locking?

A

A relief valve is installed.

Relief discharge is routed to the CST via mini flow lines for the respective pump.

39
Q

If there is a 185 psid between SG 1 and SG 2 what does that indicate?

A

A break in the main steam or main FW line.

40
Q

What happens when an AFAS 2 is signaled?

A

Identical actions as AFAS 1 but only the isolation and flow control valves associated with feeding SG 2 are cycled automatically

41
Q

When is AFN utilized under normal conditions?

A

During start up to maintain SG levels until reactor power reaches 2%

42
Q

What condition could occur if backleakage from the SGs flows into the AFW system through ISO and check valves? What is used to monitor for this condition?

A

Steam binding
Could result in water hammer

Temp indicating strips on the discharge side of the pumps
Will change color from black to blue/green in high temp.

AF, SC, SGB/D, CD Demins (4 decks)

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