G41/46 Fuel Pool Cooling and Cleanup

Question 1

Fuel pool pump trips

Answer 1

17% drain tank level low
400 gpm pump discharge low flow, 30s TD
8" HgVac pump pressure low, 4 sec TD
141 gpm differential flow for 45 sec
ESF Load shed
BUV

Question 2

What signals isolate a Filter Demin? FPCCU

Answer 2

Hi Hi conductivity 2 umho/cm
Hi Hi precoat dP of 30 psid
Hi Hi effluent strainer dP of 10 psid
Low filter demin flow of 220 gpm after 120 s TD

Question 3

Which trip will the LDS switches bypass? FPCCU

Answer 3

Differential flow 141 gpm for 45 seconds

Question 4

What max percent level does the BWRT for FPCCU have to be at to perform a backwash?

Answer 4

<44%

Question 5

What level trips FPCCU backwash transfer pump?

Answer 5

<7%

Question 6

When does the fpccu holding pump turn on?

Answer 6

<990 gpm

Question 7

When does FPCCU holding pump secure?

Answer 7

> 998gpm

Question 8

Power supply for FPCCU pumps

Answer 8

A = 15AA
B = 16AB

Question 9

What is the FPCCU Hx cooled by? Normal and backup

Answer 9

CCW and SSW

Question 10

What is the purpose of the skimmers?

Answer 10

Maintain normal pool level

Question 11

What’s the purpose of the scuppers?

Answer 11

Maintain level during transients and prevents water from entering ventilation system

Question 12

What’s the purpose of fuel pool sweep?

Answer 12

Sweep airborne contaminates from aux Bldg pools

Question 13

What are the levels for the fuel pool drain tank?

Answer 13

High level 90%

Low level 30%

Low low level 17% (pump trips)

Question 14

What’s the purpose of SFP diffusers?

Answer 14

Reduce turbulence
Prevent stagnant regions in the pool
Enhance mixing of warm water with cool water

Question 15

Where does the water return to the SFP?

Answer 15

Bottom of pool

Question 16

What pressure are the fuel pool gates maintained at?

Answer 16

26psig @ 22 psig swap to backup

Question 17

What pressure is the MSL plug maintained?

Answer 17

30 psig @ 25 psig swaps to backup

Question 18

What’s the max pressure for the plugs?

Answer 18

35 psig

Question 19

What is the design limit temp for SFP?

Answer 19

140°F

Question 20

How Much water coverage is required over fuel?

Answer 20

23 feet

Question 21

What’s the high level for SFP?

Answer 21

9 3/8 inches from top of fuel

Question 22

What is the low level for SFP?

Answer 22

16 1/8 inches from the top of the pool