ARC

Question 1

What system provides makeup water to the water seals on the ARC Pumps?

Answer 1

MWS

Question 2

Above what level in the condenser are you not allowed to run the ARC Pumps?

Answer 2

Above 264’ (Suction is at 266’)

Question 3

What is the max power that the ARC Pumps can be used at and why?

Answer 3

5% power, After that H2 becomes a concern, may damage stack on explosion…

Question 4

What will trip an ARC Pump?

Answer 4

• MSL Rad Monitor >3 times NFPB
• Low Seal water Flow (<10gpm for 10 Sec)
• Under Voltage

Question 5

What happens on a MSL Hi/Hi(or INOP) Rad Alarm to the ARC System?

Answer 5

• ARC Pumps Trip

- ARC-AOV105, ARC Pump Suction Line Isolation, will close

Question 6

What is the limit for operating at low power with low vacuum?

Answer 6

If vacuum is below 24.6”Hg, and Turbine load is less than 410MWe (30%), Trip the Turbine