Safety Injection

Question 1

What gives a SI Signal?

Answer 1

1. Pressurizer Low Pressure - 1775 psig (2/3)
2. Containment Pressure High - 1.0 psig (2/3)
3. S/G Press Low - 500 psig (1/1 on 2 S/G)
4. S/G Diff Press 1 S/G 100 psid lower than 2 others (2/3)

Question 2

A SI Signal also gives what else?

Answer 2

1. Phase A
2. CVI
3. FWI

Question 3

What Equipment gets autostart signals on a SI Signal?

Answer 3

1. EDG
2. CCPs
3. SI Pumps
4. RHR Pumps
5. CCW Pumps
6. MDAFPs
7. NESW Pumps
8. Both units ESW Pumps
9. Both units CRP Fans
10. AES Fans

Question 4

Which valves close on a SI Signal in the Charging System?

Answer 4

1. CCW to LD Hx
2. VCT Outlet Valves QMO-451/452 after suction source is realigned.
3. CCP ELOs for 2 secs then look at pressure
4. Charging Header Iso Valves QMO-200/201

Question 5

Which valves open on a SI Signal in the Charging System?

Answer 5

1. RWST Suction to CCPs IMO-910/911
2. BIT Inlet Valves IMO-255/256
3. BIT Outlet Valves ICM-250/251

Question 6

How do the CCW Hx Outlet valves change on a SI Signal?

Answer 6

Open

Question 7

How do the ESW from CCW Hx Outlet valves change on a SI Signal?

Answer 7

Throttle Open to ~ 5500 gpm

Question 8

How do the CCW from RHR Hx Outlet valves change on a SI Signal?

Answer 8

Throttle Open to ~ 3000 gpm

Question 9

What are the auto actions on the ECCS Systems on a SI?

Answer 9

1. CCPs autostart
2. Charging pump realigns to RWST
3. CCP ELOs close for 2 secs
4. Charging header isolates
5. BIT valves open
6. SI pumps start
7. RHR pumpms start
8. Accumulator outlet valves get open signal

Question 10

Is the CCW to the RHR Hx actually needed for the initial injection phase ?

Answer 10

No. It’s actually a flow path to protect the CCW pump on the SI so flow has some where to go.

Question 11

How will the CRP system realign on a SI?

Answer 11

Damper 1, normal outside air closes

Damper 2, alternate outside air part opens

Damper 3, recirc stays open