Aux Feed

Question 1

Where do the Aux feed pumps receive water from for the Steam Generators?

Answer 1

CST

Question 2

What provides the motive force for Aux Feed ‘A’?

Answer 2

Steam from main steam

Question 3

What is the mission time for the Aux Feed system?

Answer 3

13 hours and 20 minutes

Question 4

What is the backup source of water for the class aux feed pumps?

Answer 4

RMWT thru V019

Question 5

During a loss of off-site power. What can AFN do for us?

Answer 5

It can provide aux feed to the SG’s for 8 hours using the downcomer FW control and isolation valves

Question 6

When do we get an AFAS?

Answer 6

25.8% SGWL WR 2 out of 4

Question 7

What happens on an AFAS?

Answer 7

Both class AF pumps start (A and B)
Both EDG's start and their auxiliaries
S/G blowdown and sampling isolates
Flow control and block valves open until 40.8% wide range is acheived

Question 8

What happens on a SIAS/CSAS?

Answer 8

B AFP starts. N AFP trips if runnings

Both EDG’s start and their auxiliaries

Question 9

Sias and LOP or LOP. DG autostart.

Answer 9

B Aux feed pump starts. N AFP trips if runnings.

Question 10

Where do the class aux feed pump room drains go to?

Answer 10

RD system

Question 11

What provides cooling to the room coolers in the class aux feed pump rooms?

Answer 11

Essential Chill water

Question 12

What are the class AFP rooms normally cooled by?

Answer 12

Aux Bldg normal AHU

Question 13

What happens on a high level in a class aux feed pump room?

Answer 13

At approximately 3’ 6” the room dampers will close

Question 14

What is a delta-p lockout?

Answer 14

When one SG is 185 psig lower then the other one. Feed is stopped to the lower pressure generator.

Question 15

What is the minimum pump speed to provide adequate oil lubrication of the pump sleeve bearings and pump internals from the shaft driven LO pump?

Answer 15

1000 RPM

Question 16

Where does AF lube oil cooling water come from?

Answer 16

1st stage of the pump

Question 17

Where do AF pump room drains go to?

Answer 17

RD system

Question 18

What cools to the Aux feed pump room coolers inside the pump rooms?

Answer 18

EC

Question 19

When Aux feed is in its normal standby alignment. What cools the rooms?

Answer 19

Aux Building normal AHU’s

Question 20

If one of the Aux feed pump rooms has a high level, what happens?

Answer 20

At 3’ 6” the adjoining room dampener will automatically close.

Question 21

What is a delta-p lockout?

Answer 21

During an AFAS if one of the SG has a 185 psid then the other one. The lower pressure SG will stop receiving feed to prevent feeding a steam leak.

Question 22

If Aux Feed ‘A’ is running and we lose PKA, what is going to happen?

Answer 22

Lose governor control power, trips on overspeed
Steam supply valves fail as is
Aux feed isolation valves fail as is

Question 23

What happens to Aux feed ‘N’, if we lose PKA?

Answer 23

Lose control power. Switch to alternate off of ‘A’ class battery charger. Downcomer isolation valves fail open.

Question 24

Why do we have the temperature indicating strips in the aux fed discharge piping?

Answer 24

We don’t want steam getting back into the discharge piping. It could gas bind the pump and cause water hammer upon flow initiation.

Question 25

Why do the main steam supply bypass valves open for 30 seconds on a start signal to AFA?

Answer 25

- Allow the turbine to gain sufficient speed to raise governor oil pressure. This allows the governor to close down on the steam admission valve (HV-54); which prevents a turbine overspeed.

Question 26

How is HV-54 (trip and throttle valve) maintained in standby or normal operation?

Answer 26

It is maintained open

Question 27

What are the indications locally that AFA has tripped on overspeed?

Answer 27

-HV-54 linkage will not be latched - On AFA local panel Motor light will be green Valve position light will be green Over-speed light will be illuminated (white)

Question 28

If HV-54 has been manually tripped what indications do you have locally?

Answer 28

On AFA local panel - Motor light will be red - Valve light will be green Can be reset from CR, RSP or locally at panel

Question 29

What is AFA's rpm set at?

Answer 29

Approx. 3600 RPM

Question 30

Explain local operation of AFA.

Answer 30

- Check HV-54 is closed - Open control power breaker on PKA-D21 - Place local pressure gauge in service - Check HV-54 is reset - Open steam supply valve (134/138) - Open iso valve to SG - Contact w/ CR, throttle HV-54 to obtain req flow

Question 31

Explain local operation of AFA during a delta-10.

Answer 31

- Safe travel path - D-10 box (leather gloves, tach, procedure, phone) - Contact CR - HV-54 closed - Dis. Pressure gauge in service - HV-54 is reset - Isolation's to SG's closed - Open HV-54 to obtain 3560 RPM or 1800 psig - Throttle SG iso to obtain 1400-1410 psig (10 minutes) - Adjust HV-54 to obtain 3560 RPM - Throttle SG iso 1680-1690 psig (15 minutes) - Throttle SG iso 1730-1740 psig - HV-54 to 3560 RPM

Question 32

What allows for constant draining of the aux feed pump 'A' steam supply line?

Answer 32

A large condensing pot located in the aux building

Question 33

How does the aux feed pump oil system work?

Answer 33

- Oil pump is driven off of worm gear arrangement - Oil pump provides own lubrication using dipper rings to throw oil onto bearings. - supplies oil to the turbine bearings and governor actuator

Question 34

In the standby position, what position would the trip/throttle valve be in?

Answer 34

Open

Question 35

What position is the turbine governor valve when AFA is in standby?

Answer 35

Open by spring pressure

Question 36

How is the aux feed pumps bearing oil cooled?

Answer 36

By two integral oil coolers that utilize a slipstream from the pumps 1st stage discharge. This water is then directed back to the pumps suction

Question 37

Where is the valve to align aux steam to aux feed 'A'?

Answer 37

V055. 100 foot TB on west side behind IA compressors

Question 38

What are the AF critical steam traps; where are they?

Answer 38

M23 and M24. Both on the 100' TB on west side near V055.

Question 39

Explain CST levels

Answer 39

550,000 gallon capacity | 330,000 gallons reserved for AF and emergency makeup

Question 40

What are the AFA pre-starts?

Answer 40

- Pump bearing oil levels (inboard and outboard) - Turbine inboard bearing - AFA-P01 overspeed linkage reset - Temperature strip

Question 41

What are the AFB pre-starts?

Answer 41

- Pump bearing levels - Motor bearing levels - motor space heater energized - Temperature strip

Question 42

What is the preferred method to vent the AF pumps?

Answer 42

Using high point vent while flushing with CST water

Question 43

What is the alternate method to vent an AF pump that is potentially steam bound?

Answer 43

Using the drain valve on the pressure instrument while flushing with CST water

Question 44

At about what flow is AFA set to maintain?

Answer 44

3590 RPM