CV spray system

Question 1

Containment vessel spray system purpose?

Answer 1

• serves to reduce the containment pressure and temperature following a LOCA or main steam line break to near normal conditions. (42psig, and 263F)
• Also removes radioactive iodine from the containment atmosphere.

Question 2

CV spray pumps

Location, power supply, suction supplied from?

Answer 2

• Located in SI pump room
• powered by E1 and E2. A/B
• RWST is used for suction of pumps, but can get suction from RHR pumps.
• CCW cooling is available if suction is coming from RHR. Not needed while RWST is in service. (start of actuation)

Question 3

Motor Operated Valves power supplies

Answer 3

• A and C valves are MCC-5

- B and D valves are MCC-6

Question 4

SI-845s A,B,C

Discharge of SAT

Answer 4

Spray additive tank discharge. (NaOH)

• A and B normally closed, open on spray signal.
• C always open, but is throttled to 12gpm after signal. Open at 80gpm.

Question 5

SI-880s A,B,C,D

Answer 5

• CS pumps discharge valves.

- Normally closed, open on signal.

Question 6

NaOH why?

Answer 6

-Corrosion and iodine capture.

Question 7

Spray signal needs what containment pressure and the logic

Answer 7

-10psig setpoint in Containment showing on 2/3 of 2/2

Question 8

Automatic actuation causes? 10psig Hi-Hi CV alarm

Answer 8

• Main Steam Line Isolation actuation
• Spray actuation
• Safety Injection actuation
• Phase B CV isolation

Question 9

Manual actuation causes?

Both spray buttons simultaneously depressed

Answer 9

• Spray Actuation
• Phase B CV isolation
• CV Ventilation Isolation

(No MSIV close)