3.8.9 Distribution Systems - Operating

Question 1

3.8.9 Train A and Train B AC, DC, and AC vital instrument bus electrical power distribution subsystems shall be OPERABLE

Applicability: ???

Answer 1

Modes 1, 2, 3, and 4

Question 2

3.8.9

A. One AC electrical power distribution subsystem inoperable

Answer 2

A.1 Restore AC electrical distribution subsystem to OPERABLE status. (8 hours)

Question 3

3.8.9

B. One AC vital instrument bus electrical power distribution subsystem inoperable

Answer 3

B.1 Restore AC vital instrument bus electrical power distribution subsystem to OPERABLE status (2 hours)

Question 4

3.8.9

C. One DC electrical power distribution subsystems inoperable

Answer 4

C.1 Restore DC electrical power distribution subsystem to OPERABLE status (2 hours)

Question 5

3.8.9

D. Required Action and associated Completion Time not met

Answer 5

D.1 Be in mode 3 (6 hours)
AND
D.2 Be in mode 5 (36 hours)

Question 6

3.8.9

E. Two or more inoperable distribution subsystems that result in a loss of safety function.

Answer 6

E.1. Enter LCO 3.0.3 (immediately)