AF

Question 0

Where does AFN take suction from in shutdown conditions?

Answer 0

CST

Question 1

What is the purpose of the aux feed system?

Answer 1

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.

Question 2

Where does AFN discharge to during shutdown conditions?

Answer 2

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

Question 3

Where does the recirc flow from AFN discharge?

Answer 3

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

Question 4

What is the backup water source for all AFW pumps?

Answer 4

RMWT

Must be manually aligned

Question 5

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

Answer 5

Aux building normal AHUs

Question 6

What system provides electrical control power for AFA?

Answer 6

PK class 125 Vdc

Question 7

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

Answer 7

AFN

Question 8

What is the power source for AFN.

Answer 8

PBA

Question 9

What is the power source for AFB?

Answer 9

PBB

Question 10

What supplies power to all the B train valves?

Answer 10

PH

Question 11

What supplies the motive force for AFA

Answer 11

Main steam

Question 12

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

Answer 12

Aux steam

Question 13

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

Answer 13

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

Question 14

What are the two sources of control power for AFN?

Answer 14

PK and “A”train class battery charger

Question 15

Where can AFN be controlled from?

Answer 15

Locally at the breaker on PBA-S03

Control room

Question 16

Where does the suction of AFN tap into the CST?

Answer 16

Same level as the other AF pumps

Question 17

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

Answer 17

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

Question 18

What is the normal position of HV1 & HV4?

Answer 18

They are normally closed for seismic considerations

Question 19

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

Answer 19

Either locally at the breaker or from the control room

Question 20

How is AFB pump cooled and lubricated?

Answer 20

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.

Question 21

Where can and 86 lockout on AFB be reset from?

Answer 21

Locally at the breaker or control room.

Question 22

Where is AFB located?

Answer 22

81’ of MSSS in a separate room.

Question 23

How is AFA lunricated?

Answer 23

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.

Question 24

What provides cooling to the AFA pump?

Answer 24

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

Question 25

What drives the governor actuator?

Answer 25

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

Question 26

Under what conditions do we use the AFA pump

Answer 26

Blackout

Question 27

Where is steam for AFA provided from?

Answer 27

Either SG, upstream of the MSIVs.

Question 28

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

Answer 28

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

Question 29

Where is AFA located?

Answer 29

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

Question 30

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

Answer 30

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.

Question 31

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

Answer 31

The NLO will be called upon to reset the valve locally

Question 32

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

Answer 32

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

Question 33

Where can the manual electrical trip be initiated from?

Answer 33

Control room, remote shutdown panel "a" and local turbine control panel

Question 34

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

Answer 34

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

Question 35

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

Answer 35

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

Question 36

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

Answer 36

PK

Question 37

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

Answer 37

PH

Question 38

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

Answer 38

A relief valve is installed. Relief discharge is routed to the CST via mini flow lines for the respective pump.

Question 39

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

Answer 39

A break in the main steam or main FW line.

Question 40

What happens when an AFAS 2 is signaled?

Answer 40

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

Question 41

When is AFN utilized under normal conditions?

Answer 41

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

Question 42

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?

Answer 42

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.