SPMU

Question 1

What’s the range for narrow range?

Answer 1

18’ - 19’

Question 2

What’s the range for wide range?

Answer 2

10.5’ - 25.5’

Question 3

What’s the range for accident range?

Answer 3

25’ - 35’ it indicates the status of CTMT water overflowing the weir wall and into the drywell to enter RPV through the break

60’ - 75’ water adequate to cover the top of active fuel. CTMT pressure is lost @ 75’ due to highest tap being covered

Question 4

How much water will SPMU dump into the supp pool?

Answer 4

270,000 gallons

Question 5

Why is the volume limited to the separator pool?

Answer 5

So if dump occurs in Refuel bundle at highest point on grapple, approximately 1 foot of water would still cover the bundle

Question 6

When do we disable SPMU?

Answer 6

In refuel

Question 7

Will placing handswitch in TEST after a little LOCA stop the 29 minute timer?

Answer 7

NO

Question 8

How can SPMU be manually initiated?

Answer 8

Mode switch in Auto

SPMU switch in TEST

Both SPMU manual initiation pushbuttons pressed

Question 9

what’s the purpose of SPMU?

Answer 9

Provides sufficient water to the suppression pool to keep drywell vents covered during and after a LOCA

Question 10

where does suppression pool make-up water come from?

Answer 10

separator pool

Question 11

when are the valves for SPMU located?

Answer 11

161’ CTMT 180 degrees apart

Question 12

what are the setpoints for a large LOCA?

Answer 12

• 150.3” rx water level OR
  1. 39 psig DW pressure OR

LPCI/LPCS manual initiation AND

Low-low suppression pool level 17.5’ or both SPMU manual initiation pushbuttons

Question 13

What are the setpoints for a small LOCA?

Answer 13

• 41.6” Rx water level OR
  1. 23 psig DW pressure OR

NSSSS manual initiation AND

29 minute timer