P41 - SSW Flashcards
What are the types of auto starts for SSW A/B, and what is cooled with each type of start?
Component start - cools that component
LOCA - cools all divisional components
Manual initiation - cools all divisional components
LOP - switchgear room
What powers the logic to each SSW pump?
A - 11DA
B - 11DB
C - 11DC
What are the SSW A/B pump and fan trips?
Will pumps re-start when power is restored?
MPD and LOP
YES
How does SSW C auto start regardless of the signal?
Return valve opens, THEN
10 seconds later - Pump starts
If H22-P152 is placed in ON position what features are lost?
Control room indication
hand switches
Auto start features are disabled for Div 1
What will cause a component start for SSW A?
RHR A/LPCS breaker closed
E51-F045 not full closed (RCIC steam supply)
Diesel > 200 rpm
What will cause a component start for SSW B?
RHR B/C breaker closed
Diesel > 200 rpm
How does the make-up valve F113 respond to a LOCA?
closed and cannot be re-opened until signal is clear
When does the makeup valve F113 open/close?
Open 17”
Close 33.5”
When does the HI/LO Alarm come in for the head tank
Hi 41”
Low 17”
Can SSW fan be secured with auto initiation signal sealed in?
NO
Where can fans be operated from?
P870, remote shutdown panel, and alternate shutdown panel (P299)
What’s the make-up water for SSW?
PSW (P21 back-up)
How long is SSW available with no make-up water
30 days
How much water is in the SSW basins?
15 million gallons
What do the blowdown valves do on a LOCA signal?
Close and cannot be opened until signal is clear
Where can Div 1 blowdown valve be operated from other than the main control room?
Alternate Shutdown Panel
What’s the purpose of the recirc valve F002A/B?
It’s throttled and de-energized to maintain pump discharge below relief valve setpoint
When will it auto close? (recirc valve)
Auto start and heat exchanger inlet/outlet are full open or if LOCA or CTMT spray signal present
Can it manually be opened with LOCA or CTMT spray signal sealed in? (recirc valve)
NO
When does the discharge valve F001A/B open?
On auto start signal and cannot be closed until the signal is clear
When does the F005 A/B test return auto-open?
on auto start
is it throttleable?
Yes during normal OPS (no auto start)
What are the COMPONENT auto starts for SSW C?
HPCS breaker closed
DG > 800 rpm
What are the LOCA starts for SSW C?
-41.6” Rx water level
1.39 psig drywell pressure
HPCS manual initiation
Is a LOP an auto start?
NO, but will start on component start
Will CCW auto align after a LOP?
YES
When will CRAC A/B auto align?
After a LOP or LOCA
What happens to CRAC if SSW only initiates for 1 division?
The other division doesn’t have cooling water
What else lines up with SSW B to CRAC B?
ESF switchgear room coolers
When does CCW to FPCCU heat exchangers isolate?
Low flow through the heat exchanger
< 1,000gpm
Can FPCCU manually be aligned to SSW B?
Yes,
BUT ONLY, if PSW valves are closed and no LOCA signal present
What happens on a SSW A/B component start? (sequence)
Pump starts tower fans start pumphouse ventilation starts discharge and return valve open Recirc opens If DG starts and DG inlet valve opens
What happens (sequence) on SSW A/B LOCA start?
Like component start, EXCEPT: Recirc close Blowdown closes RHR heat exchanger IN and OUT open SSW tank outlet closes (Normal/LOCA components align and/or isolate
What happens on a LOP? (sequence)
Component start
ESF switchgear room aligns
(LOP components auto align)
When does the F018 DG inlet valve auto open? Div 1 and 2
> 200rpm on diesel
When do the drywell purge compressors auto align?
LOCA
Can it be overridden? (drywell purge compressors auto align on LOCA)
Yes
What’s the normal level for the SSW basin?
8’5”
When does the Hi and LO alarm come in for SSW basin level?
HI 9’11”
LO 7’9”
When does the fill valve open and close?
Open 8’ 1.5”
close 8’ 8.5”
What position is the recirc valve in after SSW A/B starts on a LOCA signal?
Closed
What is not automatically cooled by SSW B on a LOCA start?
Drywell chillers, PACs, CCW heat exchangers
What 3 main things that are cooled by SSW B that SSW A does not cool?
Drywell chillers, PACS, CCW heat exchangers
What does SSW A cool that SSW B doesn’t?
RCIC room cooler
What’s the power supplies for SSW tower fans?
C003A/B 15AA
C003C/D 16AB
What’s the purpose of the head tank?
keep discharge lines full to prevent water hammer
What’s the power supply to the SSW pumps?
SSW A - 15
SSW B - 16
SSW C - 17
What’s the purpose of SSW?
Remove heat from plant auxiliaries that require cooling during emergency shutdown
Ultimate heatsink for decay removal
CTMT/DW flooding
Cooldown components during normal cooldown
How does SSW C cool if SSW A is not running?
Natural draft
Are there any conditions associated with rad monitors
No
When will low discharge pressure alarm come in for SSW A/B?
< 73 psig after a 2 second TD
When will PSW valves go closed for switchgear room cooler relative to air pressure?
< 60 psig on instrument air
When will leak HI alarm come in for SSW A/B?
> 1200 gpm on return
When will leak HI alarm in for SSW C
> 50 gpm in return
If SSW is manually aligned to CCW and drywell chillers, what is isolated?
Plant chillers?????
Why is an operator dispatched to the pump room after an initiation?
Verify relief valve doesn’t need re-seating
What is the temp of SSW maintained at? why?
85 deg F to maintain < 90 deg F basin temp
What should flow to SSW pumps be above?
> 3700 gpm
