Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

Systems > Auxiliary feedwater > Flashcards

Auxiliary feedwater Flashcards

1
Q

Purpose of AFW system

A
  1. Provide heat sink upon loss of off site power
  2. Cool RCS down to <350F from RHR operation
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

Design basis of AFW system (5 items)

A
  1. Provide FW to the SG to remove decay heat (requires 420 gpm).
  2. Flow limiting orifice - ensures that in the event of a line rupture at least 160 gpm to intact SG
  3. Deliver flow within one minute of accident (ATWS)
  4. No operator action necessary for 30 minutes
  5. Pump design capacity of 990 gpm @ 1450 psig (assumes 100 gpm recirc flow).
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

Auto starts of AFW pumps (5)

A
  1. Any SI
  2. Low-low SG level; 2/4 detectors in 1/4 SGs U1 18% U2 36.3%
  3. UV on 2/4 RCP busses
  4. A AF PP (only) starts on UV on bus _41 (35 sec TD EDG bkr)
  5. AMS actuation; A AF Pp auto start is disabled for 70 seconds following bus _41 UV U1 15% U2 33.3%
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

A AF pump trips

A
  1. Overcurrent
  2. Low-3 suction pressure of 16.5 psia; disabled for 2.5 seconds during start
  3. UV on bus 141 (2870VAC)
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

B AF pump trips (Diesel) (five)

A
  1. Low-3 suction pressure of 16.5 psia
  2. Overcrank (<350 rpm in 55 seconds)
  3. Overspeed (1900 rpm)
  4. High jacket water temperature (205F)
  5. Low engine lube oil pressure (10 psig) disabled for 10 seconds during start.
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

What are the positions of B AF pump local C/S and what do they do?

A

Manual- starts in room only
Off- Won’t start from any location
Auto- Start from all locations (MCB, RSDP, AB 364’ column M-16)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

What are the positions of the Diesel start switch from 364’ elevation and what do they do?

A

Normal - allows start from normal locations
Start - Start remotely with suction pressure greater than lo-lo suction trip
Start with bypass - Start remotely with suction pressure less than lo-lo suction trip

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

Diesel start sequence and overcrank description:

A

5 second crank, 10 second wait (repeat).
If not running after 55 seconds, engine locks out with a reset P/B at the local panel

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

AF006 and AF017 (SX supply to AF suction) need all of the following to auto open:
What is the time delay for A train?
Do the pumps need to be running for valves to open?

A
  1. Auto start signal (Excluding AMS and 141 UV) SI, or low-low SGWL or UV on 2/4 RCP busses
  2. Low suction pressure of 18.1 psia
  3. For A-train: 4 second time delay after pump start signal
  4. For B-train: Pp does not need to be running and no time delay.
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

AF022A/B and AF024 (normal recircs and recirc to SX) description

A

Recirc also auto swaps to SX: AF022 closes when own SX suction valves (both) not fully closed AF024opens when either AF022 not fully open. When AF006s and AF017s are closed. The recircs automatically re-align (AF022s open and AF024 closes).

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

AF005s (discharges to all 4 SGs)
Loss of air ______
Loss of Inst bus 111 (A) or 114 (B)_____
Loss of DC bus 111/112______

A

Fail open on loss of air

Control signal to zero flow, once pp starts for respective train, associated AF005s fully close to obtain zero flow. Control from RSDP still available in local.

Can’t control AF005s from RSDP or MCR for the associated train.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

AF005s potentiometer set @_____ for a flow of _____, alarm if the pot is <_____.

A

6.8
170 gpm
6.7

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

B train flow lights >_____ gpm, >_____ gpm. Powered from DC bus _____.

A

80 gpm
160 gpm
DC bus 112

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

Affects of a loss of DC bus 112(212) to the B AF Pp:

A
  1. 80 gpm and 160 gpm flow lights are lost.
  2. The Pp will not autostart from any autostart signal or from the MCB or RSDP C/S.
  3. The only way to start the B AF Pp on a loss of 112 DC is from the local panel or from the C/S on 364’ elevation.
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

AF004A/B are the _______, get a signal to open when _____, fail ____ on loss of air and has own air receiver to _____ on low air pressure (70#).

A

Normally open AF pump discharge valves
Start when respective AF pump starts
Fails as is on loss of air
has own air receiver to auto open on low air pressure

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

AF suction pressure setpoints:
AF051/055 (suction of pumps)

A

47 psia Resets block of associated AF pump start
20.1 psia Low pressure alarm
18.1 psia Low pressure auto swap suction to SX if auto start present
16.5 psia Lo-2 Pps trip (2.5 sec time delay on A train)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

AF suction pressure setpoints:
AF300/301 (CST to AF line)

A

20.46 psia Blocks associated train AF pump start
Arms SX suction valves (AF006 and 017)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
18
Q

Purpose of flow limiting orifices on the discharge lines.

A

Limit break flow so that other SGs will get >160 gpm each and provide AF Pp runout protection.

19
Q

Diesel AF pump flex bypass switch details:

A

Normal allows remote start.
Flex bypass removes low pressure pump start block signal.
Start with bypass starts the pump.

20
Q

Engine start control switch must be in ______ to allow start from _____, _____, or ______.

A

Auto
MCB, RSDP, or 364’ C/S

21
Q

364’ C/S details. The ______ position will disable the _____.
Control switch must be returned to _____ to allow _____.

A

Start with bypass position; Suction pressure trip

Normal position to allow remote pump shutdown.

22
Q

The B train flow lights (>80gpm, >160 gpm) are located on ____.

A

1pm06j

23
Q

Diesel AF pp specs

A

1500 HP, 16 cylinder, 10 stage pump

24
Q

SX interfaces with diesel AF pump

A

Self driven SX booster pump (needs a flow path, but no SX pump required).
Speed increaser, oil and water jacket cooled by SX

25
Q

There are ____ sets of batteries for the diesel AF pump. One normally in service for starting and the other reserved for ____. Each bank is sufficient for _____ cranking cycles of 55 seconds each.

A

2 sets of 24 VDC batteries
Control power
4

26
Q

Fuel oil specs

A

500 gallon tank, 75%/420 gallons TS minimum, 50% pp running minimum. Burn rate of 70 gph at max rate.

27
Q

Pump oil pressure must be ____ and gear oil pressure ____ for starts from _____ and _____.

A

8#
15#
MCR and RSDP

28
Q

Diesel AFP can be started from what 4 locations?

A

MCB
RSP
Pump room on 383’
U1: C/S on 364’ between CC HX
U2: C/S on 364’ M18

29
Q

AF005
From MCR: sets _____
From RSP: sets ______
Local handwheel _____

A

Flow demand signal
Sets valve position (must energize to select local first)
Operated from 364’ (fail air first)

30
Q

Two AF trains must be operable in modes ______. IF one inoperable _____ to restore. If both inoperable _______.
LCO 3.0.3 _____.

A

1, 2, and 3
72 hours
restore one immediately

LCO 3.0.3 and all
other LCO Required
Actions requiring
MODE changes are
suspended until
one AF train is
restored to OPERABLE
status.
———————

31
Q

AF013A-H are _____ operated valves with the following operation limitation_____.

A

Motor
Throttleable motor driven, duty= 3 starts in 1 minute

32
Q

CST level bases:
Accident analysis_____
Tech spec Basis______

A

Accident analysis assumes that there is enough water to remove decay heat from a 102% trip, stay in MODE 3 for 30 minutes and cooldown to RHR at the design cooldown rate, with a loss of offsite power and “the most adverse single failure”

TS Basis Document: 212,000 gallons will maintain RCS stable at NOT/NOP for 2 hours, then cooldown to RHR entry conditions at 50F/hr, and allow a 1 hour warmup of the RHR pumps before beginning shutdown cooling

33
Q

For AF006 and AF017 to auto open, the control switch must not be in ____ and the ___ signal must be present.

A

Close
Arming

34
Q

PS-AF-300/301 reaches pressure of ______ psia and PT-AF-051/055 reaches pressure of _____ psia are inputs to the ______ annunciator.

A

20.46 psia
18.1 psia
AF PP SX SUCT VLVS ARMED ALARM

35
Q

_AF006 and _AF017 will Auto Open if:

A

Control switch – not in CLOSE
AND
AF PUMP SX SUCT VLVS ARMED annunciator LIT
AND
2/4 Lo-2 SG Level (1/4 SG)
OR
2/4 RCP bus undervoltage
OR
Any SI

36
Q

To reset the 20.46 psia AF block signal, pressure must be raised to ______.

A

47 psia

37
Q

A AF pump control switches and locations:

A

Main Control Board
Remote Shutdown Panel
Local/Remote Switch at Remote Shutdown Panel

38
Q

Sequence of manual start for the A AF pump:

A
  1. Control Switch to “START”
  2. Aux Lube Oil Pump starts
  3. When pump lube oil pressure is > 8 psig
  4. AF pump breaker will close and pump should start
    Note that breaker closing keeps aux lube oil pp running
  5. When shaft driven lube oil pump raises lube oil pressure to > 15 psig, aux lube oil pump stops
39
Q

Sequence for auto start of A AF pump

A
  1. AUTO signal received
  2. AF Pump and Aux Lube Oil Pump start at the same time
  3. When lube oil pressure > 15 psig, aux lube oil pump stops
40
Q

To clear a diesel AF pump lockout, There is a ____ and a local ______.

A

PB reset at the local control panel
Reset device near air intake manifold

41
Q

B AF pump manual starting sequence

A

C/S held in start
_B AF pp aux. L.O. pump starts
At the same time, speed increaser aux. lube oil pump starts
When oil press > 15 psig for speed increaser and oil pressure > 8 psig for the _B AF pp lube oil system, _B AF pump starts
Shaft driven pumps operate
When oil press > 23 psig for speed increaser its aux lube oil pump stops
When oil pressure > 15 psig in _B AF pp lube oil sys, its aux lube oil pump stops

42
Q

B AF pump starting sequence

A

AF pump starts
At same time both speed increaser and _B AF pp aux oil pps start
When oil press > 23 psig for speed increaser its aux L.O. pp stops
When oil pressure > 15 psig in _B AF pp L.O. Sys., its aux L.O. pp stops

43
Q

_____ gpm will bring in a high AF flow alarm.

A

190 gpm

44
Q

CST recirc valves fail ______ and SX recirc valves fail _____ on loss of power or IA.

A

Open
Closed

Systems (80 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions