ML19141A101

Summary of Exelon'S Proposal for Implementation of TSTF-500-Technical Specification Changes

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 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> (continued)

PBAPS UNIT 2 3.8-28 a Amendment No.

DC Sources

-Operating 3.8.4

ACTIONS (continued)

CONDITION REQUIRED ACTION COMPLETION TIME B C. 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.

---

B C.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 /> C D. On e Unit 2 battery charger on one subsystem inoperable

. C D.1 Restore Unit 2 battery terminal voltage to greater than or equal to the minimum established float voltage.

AND C D.2 Verify battery float current < 2 amps. AND C D.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 D E. One Unit 2 DC electrical power

subsystem inoperable f or re asons other than condition C D.

D E.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 /> E F. Required Action and Associated Completion Time of Condition A, B, C , D, or E not met. E F.1 Be in MODE

3. AND D F.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 hours4.166667e-4 days <br />0.01 hours <br />5.952381e-5 weeks <br />1.3698e-5 months <br /> F G. Two or more inoperable DC electrical power subsystems.

F G.1 Enter LCO 3.0.3.

Immediately

PBAPS UNIT 2 3.8-29 a Amendment No.

D C 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

subsyst em 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 Amendme nt 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

. AN D B.2 Verify battery float current < 2 amps. AN D 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 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> (continued)

PB APS UNIT 3 3.8-28a Amendment No.

DC Sources

-Operating 3.8.4

ACTIONS (continued)

CONDITION REQUIRED ACTION COMPLETION TIME B C. 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.

---

B C.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 /> C D. On e Unit 3 battery charger on one subsystem inoperable.

C D.1 Restore Unit 3 battery terminal voltage to greater than or equal to the minimum established float voltage.

AND C D.2 Verify battery float current < 2 amps.

AND C D.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 D E. One Unit 3 DC electrical power

subsystem inoperable

f or reasons other th an conditions C D. D E.1 Restore Unit 3 DC ele ctrical 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 /> E F. Required Action and Associated Completion

Time of Condition A, B, C, D, or E not met. E F.1 Be in MODE

3. AND E F.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 F G. Two or more inoperable DC elect rical power subsystems.

F G.1 Enter LCO 3.0.3.

Immediately

PBAPS UNIT 3 3.8-29a Amendment No.