3.8.1 AC Sources - Operating

Question 1

3.8.1

The following sources of AC electrical power shall be OPERABLE:

Answer 1

a. Two circuits between the offsite power transmission network and the onsite class 1E AC electrical power distribution system.
b. Two Diesel Generators each capable of supplying one train of the onsite Class 1E AC electrical distribution system; and
c. Automatic load sequencers for trains A and B

Question 2

3.8.1

Applicability

Answer 2

MODES 1, 2, 3, and 4

Question 3

3.8.1

A. One required offsite circuit inoperable.

Answer 3

A.1 Perform SR 3.8.1.1 for required OPERABLE offsite circuit (1 hour AND Once per 8 hours thereafter)

AND

A.2 Declare required feature(s) with no offsite power available inoperable when its redundant required feature(s) is inoperable (24 hours from discovery of no offsite power to one train concurrent with inoperability of redundant required feature(s)

AND

A.3 Restore required offsite circuit to OPERABLE status. (72 hours)

Question 4

3.8.1

B. One DG Inoperable

Answer 4

B.1 Perform SR 3.8.1.1 for the required OPERABLE required offsite circuit(s) (1 hour and once per 8 hours thereafter)

AND

B.2 Declare required feature(s) supported by the inoperable DG inoperable when its redundant required feature(s) is inoperable (4 hours from discovery of condition B concurrent with inoperability of redundant required feature(s)

AND

B.3.1 Determine OPERABLE DG is not inoperable due to common cause failure (24 hour)
OR
B.3.2 Perform SR 3.8.1.2 for OPERABLE DG (24 hours)

AND

B.4 Restore DG to OPERABLE status (10 days)

Question 5

3.8.1

C. Two required offsite circuits inoperable.

Answer 5

C.1 Declare required feature(s) inoperable when its redundant required feature(s) is inoperable (12 hours from discovery of Condition C with concurrent inoperability of redundant required feature(s)

AND

C.2 Restore one required offsite circuit to OPERABLE status (24 hours)

Question 6

3.8.1

D. One required offsite circuit inoperable AND One DG inoperable.

Answer 6

NOTE: Enter applicable conditions and actions of LCO 3.8.9 “Distribution Systems - Operating” when condition D is entered with no AC power source to a train.

D.1 Restore required offsite circuits to OPERABLE status (12 hours)

OR

D.2 Restore DG to OPERABLE status (12 hours)

Question 7

3.8.1

E. Two DGs inoperable

Answer 7

E.1 Restore one DG to OPERABLE status (2 hours)

Question 8

3.8.1

F. One automatic load sequencer inoperable.

Answer 8

F.1 Restore automatic load sequencer to OPERABLE status (24 hours)

AND

F.2 Declare required feature(s) supported by the inoperable sequencer INOPERABLE when its redundant required feature(s) is inoperable

Question 9

3.8.1

Note: condition G is not applicable for Class 1E two stage time delay for the degraded voltage relays and a fixed time delay for the loss of voltage relays

G. One or more required offsite circuits do not meet required capability

Answer 9

G.1 Restore required capability of the offsite circuit(s) (1 hour)

OR

NOTE: Enter LCO 3.8.1 condition A or C for required offsite circuits inoperable
G.2 Transfer the ESF bus(es) from the offsite circuit(s) to the EDG(s)

Question 10

3.8.1

H. Required Action and Associated Completion Time of Condition A, B, C, D, E, F, or G not met.

Answer 10

H.1 Be in MODE 3 (6 hours)

AND

H.2 Be in MODE 5 (36 hours)

Question 11

3.8.1

I. Three or more required AC sources inoperable

Answer 11

I.1 Enter LCO 3.0.3 (Immediately)

Question 12

To utilize extended completion time (completion time greater than 72 hours and less than 10 days) the following compensatory measures shall be implemented without delay:

Answer 12

The redundant DG will be verified operable and no discretionary maintenance activities will be scheduled on the redundant DG

No discretionary maintenance will be scheduled on the SBOGs, startup transformers, APS switchyard, 13.8 kV power supply lines, and transformers.

All activity, including access, in the SRP switchyard shall be closely monitored and managed per maintenance rule

Functionality of the SBOGs will be verified by ensuring that the monthly start test has been successfully completed within the previous four weeks

OPERABILITY of the steam driven aux feed pump will be verified before entering extended completion time

System dispatcher will be contacted once a day and informed of the DG status, along with the power needs of the facility

Should a severe weather warning be issued for the local area that could affect the switchyard or offsite power, an operator will be available locally at the SBOG

No discretionary maintenance will be allowed on the main and unit aux transformers associated with the unit.

Question 13

3.8.1 G

Steady State switchyard voltage minimum value is:

Answer 13

528.5 kV or the following calculated value, whichever is less
Base minimum voltage - 518kV
If offsite circuit is connected to 1-E-NAN-S05 or S06 Add 6.5kV
If house load group associated with the offsite circuit is
connected to both NBN-S01 and NBN-S02. Add 4kV
If offsite circuit is connected to another unit’s PBA-S03
or PBB-S04. Add 1.5kV