ML19141A101
| ML19141A101 | |
| Person / Time | |
|---|---|
| Site: | Peach Bottom  |
| Issue date: | 05/21/2019 |
| From: | Jennifer Tobin Plant Licensing Branch 1 |
| To: | Bryan Hanson Exelon Nuclear |
| Tobin J 415-2328 | |
| References | |
| Download: ML19141A101 (9) | |
Text
Summary of Exelon's Proposal for Implementation of TSTF-500-Technical Specification Changes The proposed changes modify the wording in TS Limiting Condition for Operation (LCO) 3.8.4, DC Sources - Operating to add an additional LCO for the opposite Unit's inoperable battery charger condition. The proposed changes are required to fix simultaneous conflicting LCO Required Action Completion Times of 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> for one unit and 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> for the other unit for a single inoperable battery charger on one Unit. The current conflicting concurrent 12-hour and 72-hour Completion Times for Unit 2 and Unit 3 for one unit's inoperable battery charger was an unidentified imbedded error incorporated under TS Amendments 320 and 323, which adopted TSTF-500.
Please see attached Technical Specification proposed markups for Unit 2 and Unit 3, respectively.
DC Sources Operating 3.8.4 3.8 ELECTRICAL POWER SYSTEMS 3.8.4 DC Sources Operating LCO 3.8.4 The following DC electrical power subsystems shall be OPERABLE:
- a.
Unit 2 Division I and Division II DC electrical power subsystems; and
- b.
Unit 3 Division I and Division II DC electrical power subsystems.
APPLICABILITY:
MODES 1, 2, and 3.
ACTIONS CONDITION REQUIRED ACTION COMPLETION TIME A. One Unit 3 DC electrical power subsystem inoperable due to performance of SR 3.8.4.7 or SR 3.8.6.6.
NOTE------------
Enter applicable Conditions and Required Actions of LCO 3.8.7, "Distribution Systems Operating," when Condition A results in de-energization of a Unit 2 4 kV emergency bus or de-energization of a Unit 3 DC bus.
A.1 Restore Unit 3 DC electrical power subsystem to OPERABLE status.
7 days (continued)
PBAPS UNIT 2 3.8-28 Amendment No.
DC Sources Operating 3.8.4 ACTIONS (continued)
CONDITION REQUIRED ACTION COMPLETION TIME B. One Unit 3 battery charger on one subsystem inoperable.
B.1 Restore Unit 3 battery terminal voltage to greater than or equal to the minimum established float voltage.
AND B.2 Verify battery float current < 2 amps.
AND B.3 Restore battery charger to OPERABLE status.
12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> Once per 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> 72 hours (continued)
PBAPS UNIT 2 3.8-28a Amendment No.
DC Sources Operating 3.8.4 ACTIONS (continued)
CONDITION REQUIRED ACTION COMPLETION TIME BC. One Unit 3 DC electrical power subsystem inoperable for reasons other than Condition A or B.
NOTE------------
Enter applicable Conditions and Required Actions of LCO 3.8.7, "Distribution Systems Operating," when Condition B results in de-energization of a Unit 2 4 kV emergency bus.
BC.1 Restore Unit 3 DC electrical power subsystem to OPERABLE status.
12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> CD. One Unit 2 battery charger on one subsystem inoperable.
CD.1 Restore Unit 2 battery terminal voltage to greater than or equal to the minimum established float voltage.
AND CD.2 Verify battery float current < 2 amps.
AND CD.3 Restore battery charger to OPERABLE status.
2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br /> Once per 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> 72 hours (continued)
PBAPS UNIT 2 3.8-29 Amendment No.
DC Sources Operating 3.8.4 ACTIONS (continued)
CONDITION REQUIRED ACTION COMPLETION TIME DE. One Unit 2 DC electrical power subsystem inoperable for reasons other than condition CD.
DE.1 Restore Unit 2 DC electrical power subsystem to OPERABLE status.
2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br /> EF. Required Action and Associated Completion Time of Condition A, B, C, D, or E not met.
EF.1 Be in MODE 3.
AND DF.2 Be in MODE 4.
12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> 36 hours FG. Two or more inoperable DC electrical power subsystems.
FG.1 Enter LCO 3.0.3.
Immediately PBAPS UNIT 2 3.8-29a Amendment No.
DC Sources Operating 3.8.4 3.8 ELECTRICAL POWER SYSTEMS 3.8.4 DC Sources Operating LCO 3.8.4 The following DC electrical power subsystems shall be OPERABLE:
- a.
Unit 3 Division I and Division II DC electrical power subsystems; and
- b.
Unit 2 Division I and Division II DC electrical power subsystems.
APPLICABILITY:
MODES 1, 2, and 3.
ACTIONS CONDITION REQUIRED ACTION COMPLETION TIME A. One Unit 2 DC electrical power subsystem inoperable due to performance of SR 3.8.4.7 or SR 3.8.6.6.
NOTE------------
Enter applicable Conditions and Required Actions of LCO 3.8.7, "Distribution Systems Operating," when Condition A results in de-energization of a Unit 3 4 kV emergency bus or de-energization of a Unit 2 DC bus.
A.1 Restore Unit 2 DC electrical power subsystem to OPERABLE status.
7 days (continued)
PBAPS UNIT 3 3.8-28 Amendment No.
DC Sources Operating 3.8.4 ACTIONS (continued)
CONDITION REQUIRED ACTION COMPLETION TIME B. One Unit 2 battery charger on one subsystem inoperable.
B.1 Restore Unit 2 battery terminal voltage to greater than or equal to the minimum established float voltage.
AND B.2 Verify battery float current < 2 amps.
AND B.3 Restore battery charger to OPERABLE status.
12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> Once per 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> 72 hours (continued)
PBAPS UNIT 3 3.8-28a Amendment No.
DC Sources Operating 3.8.4 ACTIONS (continued)
CONDITION REQUIRED ACTION COMPLETION TIME BC. One Unit 2 DC electrical power subsystem inoperable for reasons other than Condition A or B.
NOTE------------
Enter applicable Conditions and Required Actions of LCO 3.8.7, "Distribution Systems Operating," when Condition B results in de-energization of a Unit 3 4 kV emergency bus.
BC.1 Restore Unit 2 DC electrical power subsystem to OPERABLE status.
12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> CD. One Unit 3 battery charger on one subsystem inoperable.
CD.1 Restore Unit 3 battery terminal voltage to greater than or equal to the minimum established float voltage.
AND CD.2 Verify battery float current < 2 amps.
AND CD.3 Restore battery charger to OPERABLE status.
2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br /> Once per 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> 72 hours (continued)
PBAPS UNIT 3 3.8-29 Amendment No.
DC Sources Operating 3.8.4 ACTIONS (continued)
CONDITION REQUIRED ACTION COMPLETION TIME DE. One Unit 3 DC electrical power subsystem inoperable for reasons other than conditions CD.
DE.1 Restore Unit 3 DC electrical power subsystem to OPERABLE status.
2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br /> EF. Required Action and Associated Completion Time of Condition A, B, C, D, or E not met.
EF.1 Be in MODE 3.
AND EF.2 Be in MODE 4.
12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> 36 hours FG. Two or more inoperable DC electrical power subsystems.
FG.1 Enter LCO 3.0.3.
Immediately PBAPS UNIT 3 3.8-29a Amendment No.