3.8

Question 1

3.8.1 AC Sources - Operating
M1 - 4
Condition A: One off-site circuit inoperable

Answer 1

1 hour then every 8 hours: verify the other off-site circuit is available
24 hours: declare required supported features inop when its redundant feature is inop

Question 2

3.8.1 AC Sources - Operating
M1 - 4
Condition B: One DG inoperable

Answer 2

1 hour then every 8 hours: verify the other off-site circuit is available
4 hours: declare required supported features inop when its redundant feature is inop
24 hours: common cause evaluation, or run the good DG
10 days: restore the DG. Extended DG outages (> 72 hours) require comp actions

Question 3

3.8.1 AC Sources - Operating
M1 - 4
Condition C: Two off-site circuits inop

Answer 3

12 hours: declare required supported features inop when its redundant feature is inop
Restore one within 24 hours

Question 4

3.8.1 AC Sources - Operating
M1 - 4
Condition D: One off-site and one DG

Answer 4

12 hours: restore one
Enter 3.8.9 if power is lost to a bus (use 3.0.6)

Question 5

3.8.1 AC Sources - Operating
M1 - 4
Condition E: Two DGs

Answer 5

2 hours: restore one

Question 6

3.8.1 AC Sources - Operating
M1 - 4
Condition F: One load sequencer

Answer 6

24 hours: restore it
4 hours: declare required supported features inop when its redundant feature is inop

Question 7

3.8.1 AC Sources - Operating
M1 - 4
Condition G: 3 or more AC sources

Answer 7

1 hour: Restore one

Question 8

3.8.2 AC Sources - Shutdown
M5 - 6
Moving fuel

Answer 8

One off-site and one DG

IMMEDIATELY
- suspend core alts
- stop moving fuel
- stop Rx additions
- initiate actions to restore

Question 9

3.8.3 DG fuel oil, lube oil, starting air
Whenever a DG is required to be operable

Answer 9

A. < 7 days but > 6 of fuel: 48 hours to restore
B. < 7 days but > 6 of lube oil: 48 hours to restore
E. < 230# but > 185 air pressure: 48 hours to restore
Only one air receiver needed, > 250#. Enough for 5 starts
If you don’t meet the times, or < 185#, declare the associated DG inop (3.8.1 B)

Question 10

3.8.4 DC Sources - Operating
M1 - 4
2 Trains of Buses, Batteries and Chargers

Answer 10

One charger inop: 2 hours to restore voltage (130 VDC), 72 hours to restore the charger
If a train is inop for other reasons: 2 hours to restore

2 Trains inop: 1 hour to restore one

Question 11

3.8.6 Battery Parameters
When DC power is required

Answer 11

Float current
Cell voltage
Electrolyte level
Pilot cell temp
Battery capacity

Declare the battery inop and enter 3.8.4 B

Question 12

3.8.7 Inverters
M1 - 4
2 trains required

Answer 12

Operable = a PN bus is powered via its inverter with good voltage and frequency, and the inverter is powered by its charger.

1 inverter inop: 7 days to restore.
2 or more inop: 1 hour to restore all but 1

If an inverter is inop:
- no maintenance allowed on associated DG or PPS/ESFAS train

Question 13

3.8.9 Distribution Systems - Operating
M1 - 4
2 trains, each train:
One PB bus
Three PG buses
Four PH MCCs
PNA/PNC
PKA/PKC

Answer 13

One AC train inop (PB/PG/PH): 8 hours to restore
One PK or PN bus inop: 2 hours to restore
Two or more buses inop: 1 hour to restore