E22 - HPCS Flashcards
What flow does the restricting orifices restrict flow to?
9100 gpm
How long after initiation should HPCS be injecting?
32 seconds
Does HPCS Jockey pump ever auto stop?
NO
What happens on initiation? (sequence of events)
- F001 (CST suction) opens IF F015 (SP suction) is NOT full open.
- F004 OPENS (inj valve)
- F010 & F011 CLOSE (test return to CST)
- F023 CLOSES (test return to SP)
- Pump starts
- Diesel starts
- SSW C and Room cooler start 10 seconds later
Purpose of HPCS?
Designed to mitigate the effects of Post Loca
normal suction source of HPCS?
CST
Where does HPCS test return back to?
Either CST or Supp pool, depending on the suction source
What are the pump trips?
time overcurrent
instant overcurrent
underfrequency
HPCS logic can be reset with what signal still in?
High drywell pressure
What are the initiation signals for HPCS?
- 41.6” Rx level
1. 39 DW
Whats the power supply for HPCS
17AC
What suppression pool level is required for HPCS to be operable?
14’6”
Will HPCS lose its logic if power is lost?
Will you lose overrides?
NO!
When will F001 (CST suction) Auto close?
If F015 (supp pool suction) is full open
what must level be at to reset the low level logic?
Above -41.6”
When can hi drywell pressure be reset?
whenever bro
What happens if level drops below +53.5” and hi level initiation is reset?
injection valve comes back open if low level has not been reset
When will the min flow valve open?
< 1206 gpm AND > 130 psig
When will the min flow valve close?
> 1206 gpm OR < 130 psig
when does the pump suction from suppression pool open?
< 5’ CST or > 18’9” in suppression pool
what pressure is HPCS able to inject into Rx?
1177 psid
What flow rate is it injected at? High and low?
550 gpm
7115 is rated flow @ > 445 psid
when will HPCS isolate from the Rx?
When will it re-open isolation valve?
53.5” Rx water level
When high level signal is reset or -41.6” Rx water level
