E21 - LPCS Flashcards
What pressure does Inj valve open?
476 psig
what will trip LPCS motor?
LSS
Motor Protection
When does min flow valve open? close?
opens with pump running, and <1333 gpm
closes @ >1376 gpm
How long is allowable to run LPCS on min flow?
30 minutes
Does injection valve receive auto open signal on initiation?
yes, but does not open until <476 psig
When will inj valve auto close?
NEVER
When will the suction valve auto open?
NEVER. it will never auto close or open
what flow should not be exceeded to prevent pump damage?
9100
What is motor cold and how many start attempts?
80 minutes idle, 2 starts allowed
what is motor hot? How many start attempts allowed?
Pump running for 30 minutes
1 restart allowed. additional allowed after 20 minutes idle
What is the flow rate of LPCS?
7115 gpm @ 290 psid, 7450 gpm @ 125 psid
What low pressure pumps start first and when? when do the other pumps start?
- 5 seconds - LPCS/RHR C
7. 5 seconds - RHR A/B
what does the min/flow line restrict flow to?
1250 gpm
what flow will the jockey pump provide?
40 gpm @ 47 psig
what’s the purpose of test return valve?
used for full flow testing returning to suppression pool
when does LPCS initiate?
- 150.3” Rx level
1. 39 psig DW pressure
what level is required in suppression pool for NPSH
> 14.5’ or
18’ 4 1/2” to be operable
what cools LPCS pump room?
SSW A
When can the inj valve F005 be manually opened after initiation?
<530 psig
If pressure drops below 530 psig (manually open setpoint after initiation), how long after it goes back up can it still be manually opened?
15 minutes
what pressure can LPCS inject at?
< 476 psig (pump starts… valve opens at 476)
What is the suction source for LPCS?
Suppression pool
What is the purpose of LPCS?
Automatically initiate to restore and maintain Rx water level to mitigate effects of a LOCA.
Sprays inside core shroud and directly onto fuel bundles.
LPCS power supply?
15AA
Purpose of the LPCS jockey pump?
keeps discharge line full to prevent water hammer and minimize injection time
what is the additional purpose of the jockey pump?
provides fill water to div 1 suppression pool instrument reference leg
what provides the manual over-ride of LPCS?
Loss of 15AA bus
Loss of logic power
Div 1 ECCS initiation signal is reset
