Containment Spray

Question 1

LCO 3.5.5 “Containment Sump Buffering Agent and Weight Requirements” requirement

Answer 1

Buffer baskets shall contain >= 8,168 lbs and <= 10,553 lbs of Sodium Tetraborate Decahydrate

Question 2

LCO 3.5.5 “Containment Sump Buffering Agent and Weight Requirements” applicability

Answer 2

Modes 1-3

Question 3

LCO 3.6.6 “Containment Cooling Systems” requirement

Answer 3

2 containment cooling trains shall be operable

Question 4

LCO 3.6.6 “Containment Cooling Systems” applicability

Answer 4

Modes 1-3

Question 5

LCO 3.6.6 “Containment Cooling Systems” required action if less than 100% of the required post accident containment cooling capability available

Answer 5

IMMEDIATELY enter LCO 3.0.3

Question 6

What are the design parameters of the Containment Spray Pumps?

Answer 6

• 1340 gpm at 195 psia

- 1800 gpm at 175 psia

Question 7

What is the cooling water supply for the Containment Spray Pumps?

Answer 7

CCW cools the pump, bearings, and casing

Question 8

How long can the Containment Spray pumps operate without cooling?

Answer 8

• Continuously with a fluid temperature of 130 F

- 10 minutes with a fluid temperature of 320 F

Question 9

What are the power supplies for the Containment Spray Pumps?

Answer 9

P-54A - D bus

P-54B/C - C bus

Question 10

What causes the Containment Spray Pumps to auto start?

Answer 10

• Auto start on CHP if “armed”

- P-54C has a 20 second time delay to prevent starting too many loads on C bus at a time

Question 11

How are CV-3001 and CV-3002, Containment Spray Valves, operated?

Answer 11

• Normally closed
• Gets an open signal on CHP
• Will throttle on RAS to give more NPSH to the Containment Spray Pumps
• 3 position hand switch CLOSE/OPEN/THROTTLE

Question 12

What is the purpose of the CV-3001, Containment Spray Valve, CHP Bypass key switch?

Answer 12

Cuts out the CHP signal to CV-3001, to allow closing of the valve in the event that only 1 Containment Spray Pump is operating and we have a CHP signal.

Question 13

How do CV-3001 and CV-3002, Containment Spray Valves, throttle spray flow?

Answer 13

• Valve disk has holes in it that are big enough that debris from the containment sump won’t clog the valve and stop flow.
• When valves are placed in the THROTTLE position, they go to a pre-set throttled postion.

Question 14

What is the power supply for CV-3001?

Answer 14

• D11-1, and D21-1
• This valve has a right train power supply in order to close the valve (valve fails open) on a loss of left train. This valve needs to close because we would only have 1 Containment Spray Pump available to supply 2 spray headers, and a subcooling valve (P-66B subcooling valve would be closed due to P-66B not operating).

Question 15

What is the power supply for CV-3002?

Answer 15

D21-1

Question 16

What is the motive force for operating CV-3001 and CV-3002, Containment Spray Valves?

Answer 16

• Instrument air (normal)

- Nitrogen (backup)

Question 17

What will cause CV-3001, Containment Spray Valve, to auto close?

Answer 17

CV-3030, Containment Sump Outlet Valve (to left train SI pumps), fails to open after 30 seconds.

Question 18

What is the capacity of the containment spray headers?

Answer 18

Each header can supply 100% of the required spray flow

Question 19

What is the purpose of the Sodium Tetraborate Decahydrate baskets?

Answer 19

Maintains containment sump water pH between 7 and 8 during RAS to keep iodine in solution.

Question 20

How much Sodium Tetraborate Decahydrate do we have in containment?

Answer 20

20 baskets with a total weight of approximately 9,000 lbs

Question 21

What can be supplied by 1 Containment Spray Pump?

Answer 21

2 spray headers or 1 spray header and 1 HPSI subcooling valve. 2 or more Containment Spray Pumps can supply both spray headers and both HPSI subcooling valves.

Question 22

What are alternate uses of the Containment Spray System?

Answer 22

• Can be used to fill SITs when in Modes 5 and 6 (not normal method of filling)
• Can be used to boost discharge pressure of the HPSI pumps in the event of a fire that has disabled all charging pumps.