3.8.7 Inverters - Operating

Question 1

3.8.7 Inverters Operating
The required Train A and Train B inverters shall be OPERABLE.

Note: ??

Applicability: ??

Answer 1

Note: One inverter may be disconnected from its associated DC bus for <24 hours to perform an equalizing charge on its associated battery, provided:
A. The associated AC vital instrument bus is energized from its Class 1E constant voltage source regulator; and
B. All other AC vital instrument buses are energized from their associated OPERABLE inverters.

Applicability: Modes 1, 2, 3, and 4

Question 2

3.8.7

A. One required inverter inoperable

Answer 2

A.1 Note: Enter applicable Conditions and Required Actions of LCO 3.8.9 “Distribution Systems - Operating” with any vital instrument bus be-energized.

Restore inverter to OPERABLE status (7 days)

Question 3

3.8.7

B. Required Action and associated Completion Time not met.

Answer 3

B.1 Be in Mode 3 (6 hours)

AND

B.2 Be in Mode 5 (36 hours)

Question 4

3.8.7 Bases

Planned inverter maintenance or other activities that require entry into Required Action A.1 will not be undertaken concurrent with the following: ???

Answer 4

A. Planned maintenance on the associated Diesel Generator: or
B. Planned maintenance on another RPS or ESFAS channel that results in that channel being in a tripped condition.