SFP

Question 1

What are the SFP Pump trips?

Answer 1

• Load Shed
• Load Conservation
• Overload/Overcurrent

Question 2

If all SFP cooling was lost, how long would it take for the SFP to boil?

Answer 2

• 5.8 hrs with one full core offload

Question 3

What is the boron concentration suppose to be maintained at in the SFP?

Answer 3

≥ 2400 ppm*

Question 4

What is the minimum water level allowed in the SFP?

Answer 4

• 23’ above top of fuel (Basis: Iodine removal)

Question 5

What are the power supplies for the SFP Pumps?

Answer 5

• 11C 12-PP-31N

- 21C 12-PP-31S

Question 6

How do we keep from inadvertently draining the SFP?

Answer 6

• No gravity drains
• No suctions located greater than 19.5” below normal water level
• No inadvertent draining below 629’-4”
  (Tech Spec 4.3.2)

Question 7

What does TS 3.7.14 A (Fuel Storage Pool Water Level) state?

Answer 7

• If Fuel storage pool water level not within limit (>23’)
  IMMEDIATELY
• Suspend fuel movement

Question 8

What does TS 3.7.15 A (Fuel Storage Pool Boron Concentration) state?

Answer 8

• IF Fuel storage pool boron not within limit (>2400 ppm)
  IMMEDIATELY
• Suspend movement of fuel
  AND
• Initiate action to restore compliance
  OR
• Initiate action to perform fuel storage pool verification

Question 9

What is a secondary function of the SFP system?

Answer 9

• clarify and purify the water in the SFP, transfer canal, and purify the RWST

Question 10

Where do SFP discharge lines terminate and what do they do to prevent siphoning?

Answer 10

• The pump discharge lines terminate no lower than 6’ above the top of the fuel assemblies and have anti-siphon holes located about 4” below normal level.

Question 11

What happens to SFP Cooling on a Phase ‘A’?

Answer 11

• CCW to the SFP HX Isolates

Question 12

If U1 is providing cooling to the SFP Hx and has an SI, what happens?

Answer 12

• U2 will take cooling through the South Pump.

Question 13

When does a RWPP trip?

Answer 13

Load Conservation (on bus 11D)

Question 14

Core Alterations are in progress on Unit 2. RCS boron concentration has been verified to be 2360 ppm (two samples analyzed).
The crew is required to …

Answer 14

• suspend core alterations and positive reactivity changes, and initiate boration.

Question 15

Will x-ting between N SFP and S SFP cooling prevent boiling?

Answer 15

• You can x-tie through purification piping but it does not prevent boiling, just will delay it

Question 16

What are the important reactivity design features?

Answer 16

• **Keff ≤ 0.95 even with unborated water. (0.98 foam)
• ** 21” Center to center between fuel assemblies (new racks)
• Nominal enrichment < 4.95% of U-235.

Question 17

How far does the suction for the SFP pumps terminate from the top of normal water level?

Answer 17

• 19.5”

Question 18

What is the primary source of heat production in the SFP?
A. Fission Products
B. Fission Reactions
C. Fuel Cladding
D. Alteration Production

Answer 18

• A. Fission Products

Question 19

What is the basis behind the reactivity design features of the SFP

Answer 19

One misplaced fuel assembly

Question 20

How far below the surface do the SFP skimmers go

Answer 20

6” below normal surface level

Question 21

One SFP cooling loop can maintain SFP temperature below what temperature

Answer 21

180 deg F

Question 22

What level must SFP level be maintained below

Answer 22

24’ 10” to prevent overflowing the wier gate

Question 23

What is the basis behind the level design features of the SFP

Answer 23

Iodine removal