Containment Spray Flashcards
LCO 3.5.5 “Containment Sump Buffering Agent and Weight Requirements” requirement
Buffer baskets shall contain >= 8,168 lbs and <= 10,553 lbs of Sodium Tetraborate Decahydrate
LCO 3.5.5 “Containment Sump Buffering Agent and Weight Requirements” applicability
Modes 1-3
LCO 3.6.6 “Containment Cooling Systems” requirement
2 containment cooling trains shall be operable
LCO 3.6.6 “Containment Cooling Systems” applicability
Modes 1-3
LCO 3.6.6 “Containment Cooling Systems” required action if less than 100% of the required post accident containment cooling capability available
IMMEDIATELY enter LCO 3.0.3
What are the design parameters of the Containment Spray Pumps?
- 1340 gpm at 195 psia
- 1800 gpm at 175 psia
What is the cooling water supply for the Containment Spray Pumps?
CCW cools the pump, bearings, and casing
How long can the Containment Spray pumps operate without cooling?
- Continuously with a fluid temperature of 130 F
- 10 minutes with a fluid temperature of 320 F
What are the power supplies for the Containment Spray Pumps?
P-54A - D bus
P-54B/C - C bus
What causes the Containment Spray Pumps to auto start?
- 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
How are CV-3001 and CV-3002, Containment Spray Valves, operated?
- 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
What is the purpose of the CV-3001, Containment Spray Valve, CHP Bypass key switch?
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.
How do CV-3001 and CV-3002, Containment Spray Valves, throttle spray flow?
- 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.
What is the power supply for CV-3001?
- 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).
What is the power supply for CV-3002?
D21-1
What is the motive force for operating CV-3001 and CV-3002, Containment Spray Valves?
- Instrument air (normal)
- Nitrogen (backup)
What will cause CV-3001, Containment Spray Valve, to auto close?
CV-3030, Containment Sump Outlet Valve (to left train SI pumps), fails to open after 30 seconds.
What is the capacity of the containment spray headers?
Each header can supply 100% of the required spray flow
What is the purpose of the Sodium Tetraborate Decahydrate baskets?
Maintains containment sump water pH between 7 and 8 during RAS to keep iodine in solution.
How much Sodium Tetraborate Decahydrate do we have in containment?
20 baskets with a total weight of approximately 9,000 lbs
What can be supplied by 1 Containment Spray Pump?
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.
What are alternate uses of the Containment Spray System?
- 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.
