E22 - HPCS

Question 1

What flow does the restricting orifices restrict flow to?

Answer 1

9100 gpm

Question 2

How long after initiation should HPCS be injecting?

Answer 2

32 seconds

Question 3

Does HPCS Jockey pump ever auto stop?

Answer 3

NO

Question 4

What happens on initiation? (sequence of events)

Answer 4

1. F001 (CST suction) opens IF F015 (SP suction) is NOT full open.
2. F004 OPENS (inj valve)
3. F010 & F011 CLOSE (test return to CST)
4. F023 CLOSES (test return to SP)
5. Pump starts
6. Diesel starts
7. SSW C and Room cooler start 10 seconds later

Question 5

Purpose of HPCS?

Answer 5

Designed to mitigate the effects of Post Loca

Question 6

normal suction source of HPCS?

Answer 6

CST

Question 7

Where does HPCS test return back to?

Answer 7

Either CST or Supp pool, depending on the suction source

Question 8

What are the pump trips?

Answer 8

time overcurrent
instant overcurrent
underfrequency

Question 9

HPCS logic can be reset with what signal still in?

Answer 9

High drywell pressure

Question 10

What are the initiation signals for HPCS?

Answer 10

• 41.6” Rx level

1. 39 DW

Question 11

Whats the power supply for HPCS

Answer 11

17AC

Question 12

What suppression pool level is required for HPCS to be operable?

Answer 12

14’6”

Question 13

Will HPCS lose its logic if power is lost?

Will you lose overrides?

Answer 13

NO!

Question 14

When will F001 (CST suction) Auto close?

Answer 14

If F015 (supp pool suction) is full open

Question 15

what must level be at to reset the low level logic?

Answer 15

Above -41.6”

Question 16

When can hi drywell pressure be reset?

Answer 16

whenever bro

Question 17

What happens if level drops below +53.5” and hi level initiation is reset?

Answer 17

injection valve comes back open if low level has not been reset

Question 18

When will the min flow valve open?

Answer 18

< 1206 gpm AND > 130 psig

Question 19

When will the min flow valve close?

Answer 19

> 1206 gpm OR < 130 psig

Question 20

when does the pump suction from suppression pool open?

Answer 20

< 5’ CST or > 18’9” in suppression pool

Question 21

what pressure is HPCS able to inject into Rx?

Answer 21

1177 psid

Question 22

What flow rate is it injected at? High and low?

Answer 22

550 gpm

7115 is rated flow @ > 445 psid

Question 23

when will HPCS isolate from the Rx?

When will it re-open isolation valve?

Answer 23

53.5” Rx water level

When high level signal is reset or -41.6” Rx water level