Section 3.8.1 AC Sources

Question 1

What is LCO 3.8.1?

Answer 1

The following AC electrical sources shall be OPERABLE:

a. Two qualified circuits between the offsite transmission network and the onsite Class 1E AC Electrical Power Distribution System; and
b. Two Diesel Generators (DGs) each capable of supplying one train of the onsite Class 1E AC Electrical Power Distribution System.

Question 2

When is LCO 3.8.1 Applicable?

Answer 2

MODES 1, 2, 3, and 4.

Question 3

What is condition A of LCO 3.8.1?

Answer 3

One offsite circuit inoperable.

Question 4

What are the required actions and completion times for Condition A of LCO 3.8.1 (one offsite circuit inoperable)?

Answer 4

Perform SR 3.8.1.1 (offsite source check) for OPERABLE offsite circuit within 1 hour and once every 8 hours thereafter.

AND

Restore offsite circuit to OPERABLE status within 72 hours and 10 days from the date of discovery to meet LCO.

Question 5

What is condition B of LCO 3.8.1?

Answer 5

One DG inoperable.

Question 6

What are the required actions and completion times for Condition B of LCO 3.8.1 (one DG inoperable)?

Answer 6

Perform SR 3.8.1.1 (offsite source check) for the OPERABLE offsite circuit(s) within 1 hour and once every 8 hours thereafter.

AND

Declare required feature(s) supported by the inoperable DG inoperable when its redundant required feature(s) is inoperable within 4 hours

AND

Determine OPERABLE DG is not inoperable due to common cause failure with 24 hours OR perform a SR 3.8.1.2 (start test) for OPERABLE DG within 24 hours

AND

Restore DG to OPERABLE status within 7 days.

Question 7

What is condition C of LCO 3.8.1?

Answer 7

Two offsite circuits inoperable.

Question 8

What are the required actions and completion times for Condition C of LCO 3.8.1 (Two offsite circuits inoperable)?

Answer 8

Declare required feature(s) inoperable when its redundant required feature(s) is inoperable within 12 hours.

AND

Restore one offsite circuit to OPERABLE status within 24 hours.

Question 9

What is condition D of LCO 3.8.1?

Answer 9

One offsite circuit inoperable.

AND

One DG inoperable.

Question 10

What are the required actions and completion times for Condition D of LCO 3.8.1 (One offsite circuit inoperable AND One DG inoperable.)?

Answer 10

NOTE: Enter applicable Conditions and Required Actions of LCO 3.8.9, “Distribution Systems - Operating,” when Condition D is entered with no AC power source to any train.

Restore offsite circuit to OPERABLE status.with 12 hours.

OR

Restore DG to OPERABLE status within 12 hours.

Question 11

What is condition E of LCO 3.8.1?

Answer 11

Two DGs inoperable.

Question 12

What are the required actions and completion times for Condition E of LCO 3.8.1 (Two DGs inoperable.)?

Answer 12

Restore one DG to OPERABLE status with 2 hours.

Question 13

What is condition F of LCO 3.8.1?

Answer 13

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

Question 14

What are the required actions and completion times for Condition F of LCO 3.8.1 (Required Action and Associated Completion Time of Condition A, B, C, D, or E not met.)

Answer 14

Be in MODE 3 in 6 hours.

AND

Be in MODE 5 in 36 hours

Question 15

What is condition G of LCO 3.8.1?

Answer 15

Three or more AC sources inoperable.

Question 16

What are the required actions and completion times for Condition G of LCO 3.8.1 (Three or more AC sources inoperable)?

Answer 16

Enter LCO 3.0.3. immediately

Question 17

What is SR 3.8.1.1 and its required frequency?

Answer 17

Verify correct breaker alignment and voltage for

each offsite circuit every 7 days.

Question 18

What is SR 3.8.1.2 and its required frequency?

Answer 18

Every 31 days, Verify each DG starts from standby conditions and
achieves:

a. In ≤ 10 seconds, ready-to-load status; and
b. Steady state voltage ≥ 2280 V and ≤ 2520 V,
and frequency ≥ 59.5 Hz and ≤ 61.2 Hz.

Question 19

What is SR 3.8.1.3 and its required frequency?

Answer 19

Every 31 days, Verify each DG is synchronized and loaded, and operates for ≥ 60 minutes:
a. For ≥ 15 minutes loaded to greater than or
equal to peak accident load; and
b. For the remainder of the test at a load
≥ 2300 kW and ≤ 2500 kW.

NOTE: 1. Momentary transients outside the load range
do not invalidate this test. 2. This Surveillance shall be conducted on only one DG at a time. 3. This Surveillance shall be preceded by and immediately follow without shutdown a successful performance of SR 3.8.1.2.

Question 20

What is SR 3.8.1.4 and its required frequency?

Answer 20

Every 31 days, Verify each day tank contains ≥ 2500 gallons of fuel oil.

Question 21

What is SR 3.8.1.5 and its required frequency?

Answer 21

Every 18 months, Verify each DG rejects a load greater than or equal to its associated single largest post-accident load, and: a. Following load rejection, the frequency is ≤ 68 Hz; b. Within 3 seconds following load rejection, the voltage is ≥ 2280 V and ≤ 2640 V; and c. Within 3 seconds following load rejection, the frequency is ≥ 59.5 Hz and ≤ 61.5 Hz.

Question 22

What is SR 3.8.1.6 and its required frequency?

Answer 22

Every 18 months, Verify each DG, operating at a power factor ≤ 0.9, does not trip, and voltage is maintained ≤ 4000 V during and following a load rejection of ≥ 2300 kW and ≤ 2500 kW.

Question 23

What is SR 3.8.1.7 and its required frequency?

Answer 23

NOTE: This Surveillance shall not be performed in MODE 1, 2, 3, or 4.

Every 18 months, Verify on an actual or simulated loss of offsite power signal:
a. De-energization of emergency buses;
b. Load shedding from emergency buses;
c. DG auto-starts from standby condition and:
1. energizes permanently connected loads in ≤ 10 seconds,
2. energizes auto-connected shutdown
loads through automatic load
sequencer,
3.Maintains steady state voltage ≥ 2280 V and ≤ 2520 V,
4.Maintains steady state frequency ≥ 59.5 Hz and ≤ 61.2 Hz, and
5. supplies permanently connected loads for ≥ 5 minutes.

Question 24

What is SR 3.8.1.8 and its required frequency?

Answer 24

Every 18 months, Verify each DG, operating at a power factor ≤ 0.9, operates for ≥ 24 hours:
a. For ≥ 100 minutes loaded ≥ its peak
accident loading; and
b. For the remaining hours of the test loaded
≥ 2300 kW and ≤ 2500 kW.

Question 25

What is SR 3.8.1.9 and its required frequency?

Answer 25

NOTE: This Surveillance shall not be performed in
MODE 1, 2, 3, or 4.

Every 18 months, Verify each DG:
a. Synchronizes with offsite power source while
supplying its associated 2400 V bus upon a
simulated restoration of offsite power;
b. Transfers loads to offsite power source; and
c. Returns to ready-to-load operation.

Question 26

What is SR 3.8.1.10 and its required frequency?

Answer 26

NOTE: This Surveillance shall not be performed in MODE 1, 2, 3, or 4.

Every 18 months, Verify the time of each sequenced load is within ± 0.3 seconds of design timing for each automatic load sequencer.

Question 27

What is SR 3.8.1.11 and its required frequency?

Answer 27

NOTE: This Surveillance shall not be performed in MODE 1, 2, 3, or 4.

Every 18 months, Verify on an actual or simulated loss of offsite power signal in conjunction with an actual or
simulated safety injection signal:
a. De-energization of emergency buses;
b. Load shedding from emergency buses;
c. DG auto-starts from standby condition and:
1. energizes permanently connected
loads in ≤ 10 seconds,
2. energizes auto-connected emergency
loads through its automatic load
sequencer,
3. achieves steady state voltage
≥ 2280 V and ≤ 2520 V,
4. achieves steady state frequency
≥ 59.5 Hz and ≤ 61.2 Hz, and
5. supplies permanently connected loads
for ≥ 5 minutes.