P51 - Plant Air

Question 1

When will the lead compressor load and unload?

Answer 1

125 - 135 psig

Question 2

when will the lag compressor load and unload?

Answer 2

120-130 psig

Question 3

What flow will throttle the F501 valve, with 1 compressor running?

Answer 3

> 985 scfm

Question 4

what flow will throttle the F501 valve, with 2 compressors running?

Answer 4

> 1970 scfm

Question 5

When will the air bleed-off valve for instrument and plant air auto open?

Why does it do this?

Answer 5

opens at 30 psig.

it does this to force F532 to fail open, allowing air to vent to Aux bldg to be processed by STBY gas

Question 6

When will standby mode be exited?

Answer 6

Standby pressed a second time
Start button pressed
Shutdown button pressed
It is the only PAC running
Second PAC placed in standby
if it starts 5 times in 24 hours

Question 7

How many PACS can be placed in STBY at same time?

Answer 7

one

Question 8

What is normal and backup cooling for PAC’s?

Answer 8

normal - TBCW

backup - SSW B

Question 9

Will SSW B auto align to PAC in a loss of TBCW?
LOP?
LOCA?

Answer 9

TBCW - NO

LOP - YES

LOCA - NO

Question 10

Will PAC A restart automatically after a BUV/LOP?

Answer 10

No, but it can be manually started 20 SECONDS after diesel takes the bus

Question 11

At what pressure will cause a control rod drift?

Answer 11

70 psig

Question 12

What pressure does the ADS compressors boost instrument air to?

Answer 12

165 psig

Question 13

Will lamp test button alarm the control room?

Answer 13

Yes, after 5 seconds

Question 14

What happens if STBY unit runs unloaded for continuous 60 minute time period?

Answer 14

Turns off - but remains in standby

Question 15

How is PAC reset after a trip?

Answer 15

Push shutdown button locally OR take control room switch to STOP

Question 16

What are the power supplies to Plant Air Compressors and the Aux power supplies?

Answer 16

A - 16 - 16B42
B - 14 - 22B31
C - 13 - 11B31

Question 17

What control Room panels are the PAC’s controlled from?

Answer 17

A - 870
B - 854
C - 854

Question 18

What are the Plant Air Compressor Trips?

Answer 18

1. Low oil pressure
2. Discharge pressure high
3. power failure
4. cabinet high temp
5. oil pump trip
6. cabinet vent fan trip
7. motor contact trip
8. INFI-90 trouble
9. LSS for PAC A

Question 19

Where can a PAC be placed in STBY from?

Answer 19

Locally only

Question 20

When will a STBY PAC auto start?

Answer 20

Trip of running PAC
Service air low 90 psig for 40 seconds
Plant air low 115 psig for 5 seconds

Question 21

When will the F501 close on service air?

Answer 21

100 psig on plant air

Question 22

What pressure does the primary valve for instrument air maintain?

The backup valve?

Answer 22

primary - 110 psig

backup - 100 psig

Question 23

What pressure does service air maintain?

Answer 23

110 psig

Question 24

When will the service air pressure control valve go fully closed?

Answer 24

100 psig on plant air