PCIG - 1.0

Question 1

What are the instrument gas compressor trips?

Answer 1

• Low Oil Pressure (15 psig, 30 sec TD)
• Hi Oil Temp (180F)
• Hi Discharge Temp (250F b/f intclr or 300F b/f aftclr)
• Hi Suction Temp (160F air temp in Drywell)
• Hi Cooling Water Temp (125 exiting compressor)
• Low Water Pressure (44 psig(a) 45 psig(b), 30 sec TD)
• High Discharge Pressure (117# rec / 127# comp outlet)
• Low Suction Pressure (10” Hg Vac)

Question 2

Describe the PCIG compressor operations.

Answer 2

• Remotely at 1A(B)C213 [power supply C/D 480v 1-E AC]
• Manually in MCR (No Auto Start and Stop)
• Auto (85 to 106 psig)
• Auto Lead (94 to 106 psig)

Question 3

When does the PCIG local restart PB have to be used?

Answer 3

1. Compressors Locally Stopped
2. Any Normal, safety type comp trip
3. On a LOP – EO to reset safety lockout in the field

Question 4

Describe the cooling flow for the PCIG compressors.

Answer 4

SACS cools the inter and after coolers as well as the thermo syphon which contains a 50% water 50% glycol solution.

Question 5

Can the PCIG compressors be restored after a LOCA has occurred? if so, what is the process?

Answer 5

via manual override on 10C650 (MCR). – DW suctions closed, then RB opened, to prevent safety lockout!

Question 6

Can you place a running PCIG compressor in auto?

Answer 6

If the compressor is started using the manual button, it must be STOPPED, then placed in auto. If it is not stopped, the compressor will continue to run until it trips on overpressure

Question 7

Does a PCIG LOCA isolation signal result in a compressor safety lockout?

Answer 7

No, meaning the LOCA compressor trip can be reset from the control room.

Question 8

What should be done to the PCIG system if drywell temperature gets to high during a LOP? and what is the setpoint?

Answer 8

During a LOP, if Drywewll temperatures
are > 135F, the PCIG suction should be
re-aligned to RB air. First CLOSE DW
suctions, then open RB suction.

Question 9

If one PCIG compressor is secured, can that sides 1E and non-1E headers still be supplied if the cross-tie valves are shut?

Answer 9

Yes because 1E, Non 1-E and backup to instrument air for the Rx building to Torus Vacuum Breakers are connected downstream of HV-5124A and B

Question 10

When do you have to Locally reset a PCIG compressor?

Answer 10

Normal Trip
LOP
Local Stop

Question 11

1.0What are the power supplies for the compressors?

Answer 11

AK202-232
BK202-242