ML050630223

Tech Spec Pages for Amendment Nos. 133 and 112, Adoption of TSTF-360 Rev. 1

ML050630223
Person / Time
Site:	Vogtle
Issue date:	03/02/2005
From:	NRC/NRR/DLPM
To:
Gratton C, NRR/DLPM, 415-1055
Shared Package
ML050660234	List: ML050630223
References
TAC MC1029, TAC MC1030
Download: ML050630223 (29)

Text

TABLE OF CONTENTS 3.8 ELECTRICAL POWER SYSTEMS ........................ 3.8.1-1 3.8.1 AC Sources - Operating ................ 3.8.1-1 3.8.2 AC Sources - Shutdown ................ 3.8.2-1 3.8.3 Diesel Fuel Oil, Lube Oil, Starting Air, and Ventilation ... 3.8.3-1 3.8.4 DC Sources - Operating .................................................. 3.8.4-1 3.8.5 DC Sources - Shutdown ................................................... 3.8.5-1 3.8.6 BatteryParameters .................................................. 3.8.6-16l 3.8.7 Inverters - Operating .............. .................................... 3.8.7-1 3.8.8 Inverters - Shutdown.3.8.8-1 3~~~.8.8 netr hto..................................................3.8.8-1.........

3.8.9 Distribution Systems - Operating .................................................. 3.8.9-1 3.8.10 Distribution Systems - Shutdown ................................................... 3.8.10-1 3.9 REFUELING OPERATIONS................................................................

S3.9.1-1 3.9.1 Boron Concentration ................... 3.9.1-1 3.9.2 Unborated Water Source Isolation Valves ................... 3.9.2-1 3.9.3 Nuclear Instrumentation ................... 3.9.3-1 3.9.4 Containment Penetrations ................... 3.9.4-1 3.9.5 Residual Heat Removal (RHR) and Coolant Circulation

- High Water Level ............ 3.9.5-1 3.9.6 Residual Heat Removal (RHR) and Coolant Circulation

- Low Water Level 3.9.6-1 3.9.7 Refueling Cavity Water Level .3.9.7-1 4.0 DESIGN FEATURES .4.0-1 4.1 Site .4.0-1 4.2 Reactor Core ........ 4.0-1 4.3 Fuel Storage .4.0-2 5.0 ADMINISTRATIVE CONTROLS 5.1-1 5.1 Responsibility .5.1-1 5.2 Organization .5.2-1 5.3 Unit Staff Qualifications 5.3-1 5.4 Procedures .5.4-1 5.5 Programs and Manuals .5.5-1 5.6 Reporting Requirements .5.6-1 5.7 High Radiation Area .5.7-1 (continued)

Vogtle Units 1 and 2 iv Amendment No.1'33(Unit 1)

Amendment No.1 12 (Unit 2)

TABLE OF CONTENTS LIST OF TABLES 1.1-1 MODES ............................................................................................... 1.1-7 3.3.1-1 Reactor Trip System Instrumentation ................................................... 3.3.1-14 3.3.2-1 Engineered Safety Feature Actuation System Instrumentation ............................................................................. 3.3.2-9 3.3.3-1 Post Accident Monitoring Instrumentation ............................................ 3.3.3-6 3.3.4-1 Remote Shutdown System Instrumentation and Controls..................... 3.3.4-3 3.3.6-1 Containment Ventilation Isolation Instrumentation................................ 3.3.6-5 3.3.7-1 CREFS Actuation Instrumentation........................................................ 3.3.7-6 3.7.1-1 Maximum Allowable Power Range Neutron Flux High Trip Setpoint with Inoperable Main Steam Safety Valves..................... 3.7.1-3 3.7.1-2 Main Steam Safety Valve Lift Settings.................................................. 3.7.14 I

5.5.9-1 Minimum Number of Steam Generators to Be' Inspected During Inservice Inspection.......................................... 5.5-12 5.5.9-2 Steam Generator Tube Inspection........................................................ 5.5-13 (continued)

Vogtle Units 1 and 2 V Amendment No.1 33(Unit 1)

Amendment No.1 12(Unit 2)

DC Sources - Operating 3.8.4 3.8 ELECTRICAL POWER SYSTEMS 3.8.4 DC Sources - Operating LCO 3.8.4 Four class 1E 125 V DC electrical power sources shall be OPERABLE.

APPLICABILITY: MODES 1, 2,3, and 4.

ACTIONS CONDITION REQUIRED ACTION COMPLETION TIME A. One DC electrical power --------NOTE-------

source inoperable due to Enter applicable Conditions and inoperable battery A or B. Required Actions of LCO 3.8.1, "AC Sources - Operating," for emergency diesel generator made Inoperable by Inoperable battery A or B.

A.1 Restore DC electrical 24 hours1 days <br />0.143 weeks <br />0.0329 months <br /> power source to OPERABLE status.

B. One DC electrical power B.1 Verify SAT available 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> source Inoperable due to Inoperable battery C or D. AND Once per 12 hours0.5 days <br />0.0714 weeks <br />0.0164 months <br /> thereafter AND B.2 Restore DC electrical 24 hours1 days <br />0.143 weeks <br />0.0329 months <br /> power source to OPERABLE status.

(continued)

Vogtle Units 1 and 2 3.8.4-1 Amendment No.133(Unit 1)

Amendment No.11 2(Unit 2)

DC Sources - Operating 3.8.4 ACTIONS (continued)

CONDITION REQUIRED ACTION COMPLETION TIME C. One DC electrical power C.1 Restore DC electrical 2 hours0.0833 days <br />0.0119 weeks <br />0.00274 months <br /> source inoperable for power source to reasons other than OPERABLE status.

Condition A or B.

D. Required Action and D.1 Be in MODE 3. 6 hours0.25 days <br />0.0357 weeks <br />0.00822 months <br /> Associated Completion Time not met. AND D.2 Be in MODE 5. 36 hours1.5 days <br />0.214 weeks <br />0.0493 months <br /> I SURVEILLANCE REQUIREMENTS SURVEILLANCE FREQUENCY SR 3.8.4.1 Verify battery terminal voltage is greater than or 7 days equal to the minimum established float voltage.

SR 3.8.4.2 Verify the battery charger supplies: 18 months I

. 400 amps for System A and B 2 300 amps for System C, and 2 200 amps for System D at greater than or equal to the minimum established float voltage for 2 8 hours0.333 days <br />0.0476 weeks <br />0.011 months <br /> for Systems A and B and 2 3 hours0.125 days <br />0.0179 weeks <br />0.00411 months <br /> for Systems C and D.

OR Verify each battery charger can recharge the battery to the fully charged state within 12 hours0.5 days <br />0.0714 weeks <br />0.0164 months <br /> while supplying the largest combined demands of the various continuous steady state loads, after a battery discharge to the bounding design basis event discharge state.

(continued)

Vogtle Units I and 2 3.8.4-2 Amendment No. 133(Unit 1)

Amendment No. 112(Unit 2)

DC Sources - Operating 3.8.4 SURVEILLANCE REQUIREMENTS (continued)

SURVEILLANCE FREQUENCY SR 3.8.4.3 ----------------------- NOTES----------

1. The modified performance discharge test in SR 3.8.6.6 may be performed in lieu of the I service test in SR 3.8.4.3.

2. This Surveillance shall not be performed In MODE 1, 2, 3, or 4. However, credit may be taken for unplanned events that satisfy this SR.

Verify battery capacity Is adequate to supply, and 18 months maintain In OPERABLE status, the required emergency loads for the design duty cycle when subjected to a battery service test.

Vogtle Units 1 and 2 3.8.4-3 Amendment No.1 33(Unit 1)

Amendment No. 11 2(Unit 2)

DC Sources - Shutdown 3.8.5 SURVEILLANCE REQUIREMENTS SURVEILLANCE FREQUENCY SR 3.8.5.1 --------------------NOTE --------------------

The following SRs are applicable but not required to be performed:

SR 3.8.4.2 SR 3.8.4.3 For the DC electrical power sources required to be In accordance with OPERABLE, the following SRs of Specification applicable SRs 3.8.4 are applicable:

SR 3.8.4.1 SR 3.8.4.2 (see Note) -

SR 3.8.4.3 (see Note)

.I Vogtle Units 1 and 2 3.8.5-2 Amendment No.133(Unit 1)

Amendment No.11 2(Unit 2)

Battery Parameters I 3.8.6 3.8 ELECTRICAL POWER SYSTEMS 3.8.6 Battery Parameters I

LCO 3.8.6 Battery parameters for the required Class 1E 125 V batteries shall be within limits.

APPLICABILITY: When associated DC electrical power sources are required to be OPERABLE.

ACTIONS CONDITION REQUIRED ACTION COMPLETION TIME A. One battery with one or A.1 Perform SR 3.8.4.1. 2 hours0.0833 days <br />0.0119 weeks <br />0.00274 months <br /> more battery cells float

-voltage < 2.07 V. AND A.2 Perform SR 3.8.6.1. 2 hours0.0833 days <br />0.0119 weeks <br />0.00274 months <br /> AND A.3 Restore affected cell 24 hours1 days <br />0.143 weeks <br />0.0329 months <br /> voltage 2 2.07 V.

t B. Battery A or B with float B.1 Perform SR 3.8.4.1. 2 hours0.0833 days <br />0.0119 weeks <br />0.00274 months <br /> current > 2 amps.

AND OR B.2 Restore battery float 12 hours0.5 days <br />0.0714 weeks <br />0.0164 months <br /> Battery C or D with float current to within limit.

current > 1 amp.

(continued)

Vogtle Units 1 and 2 3.8.6-1 Amendment No.1 33(Unit 1)

Amendment No. 11 2(Unit 2)

Battery Parameters 3.8.6 ACTIONS (continued)

CONDITION REQUIRED ACTION COMPLETION TIME NOTE - --- NOTE ---

Required Action C.2 shall be Required Actions C.1 and C.2 are completed if electrolyte-level only applicable -if-electrolyte level was below the top pf plates. was below the tofpof plates.

C. One battery with one or C.1 Restore electrolyte level to 8 hours0.333 days <br />0.0476 weeks <br />0.011 months <br /> more cells electrolyte above top of plates.

level less than minimum established design limits. AND C.2 Verify no evidence of 12 hours0.5 days <br />0.0714 weeks <br />0.0164 months <br /> leakage.

AND C.3 Restore electrolyte level to 31 days greater than or equal to minimum established design limits.

D. One battery with pilot cell D.1 Restore battery pilot cell 12 hours0.5 days <br />0.0714 weeks <br />0.0164 months <br /> electrolyte temperature temperature to greater less than minimum than or equal to minimum established design limits. established design limits.

E. Two or more batteries E.1 Restore battery 2 hours0.0833 days <br />0.0119 weeks <br />0.00274 months <br /> with battery parameters parameters for at least not within limits. three batteries to within limits.

F. Required Action and F.1 Declare associated battery Immediately associated Completion inoperable.

Time of Condition A, B, C, D, or E not met.

OR (continued)

Vogtle Units I and 2 3.8.6-2 Amendment No. 1 33(Unit 1)

Amendment No.1 12(Unit 2)

Battery Parameters I 3.8.6 ACTIONS SURVEILLANCE FREQUENCY F. (continued)

One battery with one or more battery cells float voltage < 2.07 V and float current > 2 amps for systems A or B batteries, or > 1 amp for system CorD.

SURVEILLANCE REQUIREMENTS SURVEILLANCE FREQUENCY SR 3.8.6.1 NOTE Not required to be mnet when battery terminal voltage is less than the minimum established float voltage of SR 3.8.4.1.

Verify each system A and B battery float current is 7 days s 2 amps. Verify each system C and D battery float current is s 1 amp.

SR 3.8.6.2 Verify each battery pilot cell voltage is 2 2.07 V. 31 days SR 3.8.6.3 Verify each battery connected cell electrolyte level is 31 days

-greater than or equal to minimum established design limits.

SR 3.8.6.4 Verify each battery pilot cell temperature is greater 31 days than or equal to minimum established design limits.

(continued)

Vogtle Units 1 and 2 3.8.6-3 Amendment No. 133(Unit 1)

Amendment No.1 12(Unit 2)

Battery Parameters I 3.8.6 SURVEILLANCE REQUIREMENTS (continued)

SURVEILLANCE FREQUENCY SR 3.8.6.5 Verify each battery connected cell voltage is a 2.07 V. 92 days I SR 3.8.6.6 - NOTE This Survelliance shall not be performed in MODE 1, 2, 3, or 4. However, credit may be taken for unplanned events that satisfy this SR.

Verify battery capacity is 2 80% of the manufacturer's 60 months rating when subjected to a performance discharge test or a modified performance discharge test. AND 12 months when battery shows degradation or has reached 85% of expected life with capacity < 100% of manufacturers rating AND 24 months when battery has reached 85% of the expected life with capacity a 100% of manufacturers rating Vogtle Units 1 and 2 3.8.6-4 Amendment No.1 33(Unit 1)

Amendment No. 11 2(Unit 2)

Programs and Manuals 5.5 5.5 Programs and Manuals 5.5.18 Configuration Risk Manaaement Program (continued)

d. Provisions for assessing the need for additional actions after the discovery of additional equipment out of service conditions while in the LCO Condition.

e. Provisions for considering other applicable risk significant contributors such as Level 2 issues and external events, qualitatively or quantitatively.

5.5.19 Battery Monitoring and Maintenance Program This program provides for restoration and maintenance, based on the recommendations of IEEE Standard 450-1995, 'IEEE Recommended Practice for Maintenance, Testing, and Replacement of Vented Lead-Acid Batteries for Stationary Applications," of the following:

a. Actions to restore battery cells with float voltage < 2.13 V, and

b. Actions to equalize and test battery cells that had been discovered with electrolyte level below the top of the plates.

Vogtle Units 1 and 2 5.5-22 Amendment No. 133 (Unit 1)

Amendment No. 112 (Unit 2)

TABLE OF CONTENTS B3.7 PLANT SYSTEM S.......................................................................... B 3.7.1-1 B 3.7.1 Main Steam Safety Valves (MSSVs). B 3.7.1-1 B 3.7.2 Main Steam Isolation Valves (MSIVs). B 3.7.2-1 B 3.7.3 Main Feedwater Isolation Valves (MFIVs) and Main Feedwater Regulation Valves (MFRVs) and Associated Bypass Valves...................................................... B 3.7.3-1 B 3.7.4 Atmospheric Relief Valves (ARVs) ................................................ B 3.7.4-1 B 3.7.5 Auxiliary Feedwater (AFW) System ......................... ; B 3.7.5-1 B 3.7.6 Condensate Storage Tank (CST)................................................... B 3.7.6-1 B 3.7.7 Component Cooling Water (CCW) System .................................... B 3.7.7-1 B 3.7.8 Nuclear Service Cooling Water (NSCW) System ........................... B 3.7.8-1 B 3.7.9 Ultimate Heat Sink (UHS)............................................................... B 3.7.9-1 B 3.7.10 Control Room Emergency Filtration System (CREFS) -

Both Units Operating.............................................................. B 3.7.1 0-1 B 3.7.11 Control Room Emergency Filtration System (CREFS) -

One Unit Operating................................................................. B 3.7.11-1 B 3.7.12 Control Room Emergency Filtration System (CREFS) -

Both Units Shut Down............................................................. B 3.7.12-1 B 3.7.13 Piping Penetration Area Filtration and Exhaust System (PPAFES).................................................................. B 3.7.13-1 B 3.7.14. Engineered Safety Feature (ESF) Room Cooler and Safety-Related Chiller System.. B 3.7.14-1 B 3.7.15 Fuel Storage Pool Water Level...................................................... B 3.7.15-1 B 3.7.16 Secondary Specific Activity............................................................. B 3.7.16-1 B 3.7.17 Fuel Storage Pool Boron Concentration......................................... B 3.7.17-1 B 3.7.18 Fuel Assembly Storage in the Fuel Storage Pool ........................... B 3.7.18-1 B 3.8 ELECTRICAL POWER SYSTEMS................................................. B 3.8.1-1 B 3.8.1 AC Sources - Operating .................. B 3.8.1-1 B 3.8.2 AC Sources - Shutdown ................. . B 3.8.2-1 B 3.8.3 Diesel Fuel Oil, Lube Oil, and Starting Air...................................... B 3.8.3-1 B 3.8.4 DC Sources - Operating................................................................ B 3.8.4-1 B 3.8.5 DC Sources - Shutdown B 3.8.5-1 B 3.8.6 Battery Parameters. ................................................................ B 3.8.6-1 I B 3.8.7 Bateter InvertersPaameerstn .......................................................................

- Operating ..................................................................... B 3.8.7-1 B 3.8.8 inverters - Shutdown B 3.8.8-1 B 3.8.9 Distribution Systems -Operating................................................... B 3.8.9-1 B 3.8.10 Distribution Systems - Shutdown................................................... B 3.8.1 0-1 (continued)

Vogtle Units 1 and 2 ... Revision 2

DC Sources-Operating B 3.8.4 BASES BACKGROUND Batteries are sized in accordance with IEEE 485 (Ref. 3) to have (continued) sufficient capacity to supply the required loads for a loss of coolant/

loss of offsite power (LOCANLOSP) duration of 2 3/4 hours0.167 days <br />0.0238 weeks <br />0.00548 months <br /> and a station blackout (SBO) duration of 4 hours0.167 days <br />0.0238 weeks <br />0.00548 months <br />. For LOSP/LOCA, they are sized at a minimum temperature of 700 F; their initial capacity was increased by 10% for load growth and 25% for aging. The required final (end of duty cycle and end of life) battery cell voltages for each load group have been analyzed to demonstrate that adequate voltage Is provided to the loads. The battery voltage specifications are discussed in detail for each load group in FSAR, Chapter 8 (Ref. 4).

The battery cells are of flooded lead acid construction with a nominal specific gravity of 1.215. This specific gravity corresponds to an open circuit battery voltage of approximately 121.8 V for a 59 cell battery (i.e., cell voltage of 2.065 volts per cell (Vpc)). The open circuit voltage is the voltage maintained when there is no charging or discharging. Once fully charged with its open circuit voltage ? 2.065 Vpc, the battery cell will maintain its capacity for.30 days without further charging per manufacturer's instructions. Optimal long term performance however, Is obtained by maintaining a float voltage 2.20 to 2.25 Vpc. This provides adequate over-potential, which limits the formation of lead sulfate and self discharge: The nominal float voltage of 2.23 Vpc corresponds to a total float voltage output of 131.6 V for a 59 cell battery as discussed In the FSAR, Chapter 8 (Ref. 4).

Each 125 VDC battery is provided with two battery chargers, each of which is sized to supply the continuous (long term) demand on its associated DC system while providing sufficient power to replace 110% of the equivalent ampere-hours removed from the battery during a design basis battery discharge cycle within a 12 hour1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> period after charger Input power is restored. Normally, both battery chargers are on line with load sharing circuitry to ensure that the DC load is properly shared between the two chargers. Only one charger Is required OPERABLE to support the associated DC power system.

The sizing of each battery charger meets the requirements of IEEE 308 (Ref. 1) and Regulatory Guide 1.32 (Ref. 5).

The battery chargers are normally in the float-charge mode. Float-charge is the condition In which the charger is supplying the connected loads and the battery cells are receiving adequate current to optimally charge the battery. This assures the internal losses of a battery are overcome and the battery is maintained in a fully charged state.

(continued)

Vogtle Units 1 and 2 B 3.8.4-2 Revi si on 2

DC Sources-Operating B 3.8.4 BASES BACKGROUND When desired, the chargers can be placed in the equalize mode. The (continued) equalize mode is at a higher voltage than the float mode and charging current is correspondingly higher. The battery charger is operated in the equalize mode after a battery discharge or for routine maintenance. Following a battery discharge, the battery recharge characteristic accepts current at the current limit of the battery charger (ifthe discharge was significant, e.g., following a battery service test) until the battery terminal voltage approaches the charger voltage setpoint. Charging current then reduces exponentially during the remainder of the recharge cycle. Lead-calcium batteries have recharge efficiencies of greater than 95%, so once at least 105% of the ampere-hours discharged have been returned, the battery capacity would be restored to the same condition as Itwas prior to the discharge. This can be monitored by direct observation of the exponentially decaying charging current or by evaluating the amp-hours discharged from the battery and amp-hours returned to the battery.

The DC power distribution system is described in more detail in Bases for LCO 3.8.9, "Distribution System-Operating," and LCO 3.8.10, "Distribution Systems-Shutdown."

APPLICABLE The initial conditions of Design Basis Accident (DBA) and transient SAFETY ANALYSES analyses in the FSAR, Chapter 6 (Ref. 6), and in the FSAR, Chapter 15 (Ref. 7), assume that Engineered Safety Feature (ESF) systems are OPERABLE. The DC electrical power system provides normal and emergency DC electrical power for the DGs, emergency auxiliaries, and control and switching during all MODES of operation.

The OPERABILITY of the DC sources is consistent with the initial assumptions of the accident analyses and is based upon meeting the design basis of the unit. This includes maintaining the DC sources OPERABLE during accident conditions in the event of:

a. An assumed loss of all offsite AC power or all onsite AC power; and

b. A worst case single failure.

The DC sources satisfy Criterion 3 of 10 CFR 50.36 (c)(2)(ii).

(continued)

Vogtle Units 1 and 2 B 3.8.4-3 Revision 3

DC Sources-Operating B 3.8.4 BASES (continued)

LCO The DC electrical power sources, each source consisting of one battery, battery charger, and the corresponding control equipment and interconnecting cabling supplying power to the associated bus within the train are required to be OPERABLE to ensure the availability of the required power to shut down the reactor and maintain it in a safe condition after an anticipated operational occurrence (AOO) or a postulated DBA. Loss of any train DC electrical power source does not prevent the minimum safety function from being performed (Ref. 4).

An OPERABLE DC electrical power source requires the battery and one charger per battery to be operating and connected to the associated DC bus.

APPLICABILITY The DC electrical power sources are required to be OPERABLE In MODES 1, 2, 3, and 4 to ensure safe unit operation and to ensure that:

a. Acceptable fuel design limits and reactor coolant pressure boundary limits are not exceeded as a result of AOOs or abnormal transients; and

b. Adequate core cooling is provided, and containment Integrity and other vital functions are maintained in the event of a postulated DBA.

The DC electrical power requirements for MODES 5 and 6 are addressed in the Bases for LCO 3.8.5, 'DC Sources- Shutdown.'

ACTIONS A.1 Condition A represents one DC electrical source Inoperable due to an inoperable battery A or B. Because battery A Is necessary for emergency diesel generator (EDG) A to start and for generator field flashing, and similarly battery B for EDG B, Required Action A.1 Is modified by a Note directing that the applicable Conditions and Required Actions of LCO 3.8.1 be entered for the EDG made inoperable by the inoperable battery. In addition, with either battery A or B inoperable, the associated DC bus Is being supplied by the OPERABLE battery charger. Any event that results in a loss of the AC bus supporting the (continued)

Vogtle Units 1 and 2 B 3.8.4-4 Revision 1

DC Sources-Operating B 3.8.4 BASES ACTIONS A.1 (continued) battery charger will also result in loss of DC to the associated 120 V vital AC bus. Recovery of the AC bus supporting the charger, especially If It Is due to a loss of offsit6 power, will be hampered by the fact that many of the components necessary for the recovery (e.g.,

diesel generator control and field flash, AC load shed and diesel generator output circuit breakers, etc.) likely rely upon the battery. In addition, the energization transients of any DC loads that are beyond the capability of the battery charger and normally require the assistance of the battery will not be able'to be brought online. The 24 hour2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> limit allows sufficient time to effect restoration of an inoperable battery given that the majority of the conditions that lead to battery inoperability (e.g., loss of battery charger, battery cell voltage less than 2.07 V, etc.) are Identified in Specifications 3.8.4, 3.8.5, and 3.8.6 together with additional specific completion times.

B.1 and B.2 Condition B represents one DC electrical source inoperable due to an Inoperable battery C or D. Neither batteries C nor D are necessary for the EDGs to start and for generator field flashing. However, they are required for breaker control power, instrumentation, RHR suction Isolation valve Inverters, etc. Therefore, It Is prudent to verify the availability of the standby auxiliary transformer (SAT), and Required Action B.1 does that within 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> and once per 12 hours0.5 days <br />0.0714 weeks <br />0.0164 months <br /> thereafter.

With either battery C or D inoperable, the associated DC bus is being supplied by the OPERABLE battery charger. Any event that results in a loss of the AC bus supporting the battery charger will also result in loss of DC to the associated 120 V vital AC bus. Recovery of the AC bus supporting the charger, especially if it Is due to a loss of offsite power, may be hampered by the fact that components necessary for the recovery likely rely upon the battery. The 24 hour2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> limit allows sufficient time to effect restoration of an inoperable battery given that the majority of the conditions that lead to battery inoperability (e.g.,

loss of battery charger, battery cell voltage less than 2.07 V, etc.) are identified in Specifications 3.8.4, 3.8.5, and 3.8.6 together with additional specific completion times.

C.1 Condition C represents one train with a loss of ability to completely respond to an event, and/or a potential loss of ability to remain (continued)

Vogtle Units 1 and 2 B 3.8.4-5 Revi si on 1

DC Sources-Operating B 3.8.4 BASES ACTIONS C.1 (continued) energized during normal operation. The 2 hour2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br /> limit is consistent with the allowed time for an inoperable DC distribution system train.

If one of the required DC electrical power sources is inoperable for reasons other than Condition A or B (e.g., inoperable battery charger or inoperable battery charger and associated inoperable battery), the remaining DC electrical power sources have the capacity to support a safe shutdown and to mitigate an accident condition. Since a subsequent worst case single failure could, however, result in the loss of the minimum necessary DC electrical sources to mitigate a worst case accident, continued power operation should not exceed 2 hours0.0833 days <br />0.0119 weeks <br />0.00274 months <br />.

The 2 hour2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br /> Completion Time is based on Regulatory Guide 1.93 (Ref. 8) and reflects a reasonable time to assess unit status as a function of the Inoperable DC electrical power source and, if the DC electrical power source Is not restored to OPERABLE status, to prepare to effect an orderly and safe unit shutdown.

D.1 and D.2 If the inoperable DC electrical power source cannot be restored to OPERABLE status within the required Completion Time, the unit must be brought to a MODE in which the LCO does not apply. To achieve this status, the unit must be brought to at least MODE 3 within 6 hours0.25 days <br />0.0357 weeks <br />0.00822 months <br /> and to MODE 5 within 36 hours1.5 days <br />0.214 weeks <br />0.0493 months <br />. The allowed Completion Times are reasonable,-based on operating experience, to reach the required unit conditions from full power conditions in an orderly manner and without challenging plant systems. The Completion Time to bring the unit to MODE 5 is consistent with the time required in Regulatory Guide 1.93 (Ref. 8).

SURVEILLANCE SR 3.8.4.1 REQUIREMENTS Verifying battery terminal voltage while on float charge for the batteries helps to ensure the effectiveness of the battery chargers, which support the ability of the batteries to perform their intended function. Float charge is the condition in which the charger Is supplying the continuous charge required to overcome the internal losses of a battery and maintain the battery In a fully charged state while supplying the continuous steady state loads of the associated (continued)

Vogtle Units 1 and 2 B 3.8.4-6 Revi si on I

DC Sources -Operating B 3.8.4 BASES SURVEILLANCE SR 3.8.4.1 (continued)

REQUIREMENTS DC subsystem. On float charge, battery cells will receive adequate current to optimally charge the battery. The voltage requirements are based on the nominal design voltage of the battery and are consistent with the minimum float voltage established by the battery manufacturer (2.20 Vpc times the number of connected cells for the battery terminal voltage). This voltage maintains the battery plates In a condition that supports maintaining the grid life (expected to be approximately 20 years). The 7 day Frequency Is consistent with manufacturer recommendations and IEEE-450 (Ref. 9).

SR 3.8.4.2 This SR verifies the design capacity of the battery chargers (Ref. 4).

According to Regulatory Guide 1.32 (Ref. 5), the battery charger supply Is recommended to be based on the largest combined demands of the various steady state loads and the charging capacity to restore the battery from the design minimum charge state to the fully charged state, Irrespective of the status of the unit during these demand occurrences. The minimum required amperes and duration ensures that these requirements can be satisfied.

This SR provides two options. One option requires that each battery charger be capable of supplying the necessary current for each system at the minimum established float voltage for 8 hours0.333 days <br />0.0476 weeks <br />0.011 months <br /> for systems A and B and 3 hours0.125 days <br />0.0179 weeks <br />0.00411 months <br /> for systems C and D. The ampere requirements are based on the output rating of the chargers. The voltage requirements are based on the charger voltage level after a response to a loss of AC power. The time period is sufficient for the charger temperature to have stabilized and to have been maintained for at least 2 hours0.0833 days <br />0.0119 weeks <br />0.00274 months <br />.

The other option requires that each battery charger be capable of recharging the battery after a service test coincident with supplying the largest combined demands of the various continuous steady state loads (irrespective of the status of the plant during which these demands occur). This level of loading may not normally be available following the battery service test and will need to be supplemented with additional loads. The duration for this test may be longer than the charger sizing criteria since the battery recharge is affected by (continued)

Vogtle Units 1 and 2 B 3.8.4-7 Revision 2

DC Sources -Operating B 3.8.4 BASES SURVEILLANCE SR 3.8.4.2 (continued)

REQUIREMENTS float voltage, temperature, and the exponential decay in charging current. The systems A and B batteries are recharged when the measured charging current Is 5 2 amps. The system C and D batteries are recharged when the measured charging current is S 1 amp.

The Surveillance Frequency Is acceptable, given the unit conditions required to perform the test and the other administrative controls existing to ensure adequate charger performance during these 18 month intervals. In addition, this Frequency is intended to be consistent with expected fuel cycle lengths.

For a battery charger with charger output aligned to the associated 1E 125 VDC bus, this Surveillance is required to be performed during MODES 5 and 6 since it would require the DC electrical power subsystem to be Inoperable during performance of the test.

SR 3.8.4.3 A battery service test is a special test of battery capability, as found, to satisfy the design requirements (battery duty cycle) of the DC electrical power system. The discharge rate and test length should correspond to the design duty cycle requirements as specified in Reference 4.

The Surveillance Frequency of 18 months is consistent With the recommendations of Regulatory Guide 1.32 (Ref. 5) and Regulatory Guide 1.129 (Ref. 10), which state that the battery service test should be performed during refueling operations or at some other outage, with Intervals between tests, not to exceed 18 months.

This SR Is modified by two Notes. Note 1 allows the performance of a modified performance discharge test in lieu of a service test.

The reason for Note 2 is that performing the Surveillance would perturb the electrical distribution system and challenge safety systems. Credit may be taken for unplanned events that satisfy this SR. Examples of unplanned events may include:

1. Unexpected operational events which cause the equipment to perform the function specified by this Surveillance, for which adequate documentation of the required performance Is available; and (continued)

Vogtle Units 1 and 2 B 3.8.4-8 Revision 3

DC Sources-Operating B 3.8.4 BASES SURVEILLANCE SR 3.8.4.3 (continued)

REQUIREMENTS

2. Post Corrective maintenance testing that requires performance of this Surveillance In order to restore the component to OPERABLE, provided the maintenance was required, or performed in conjunction with maintenance required to maintain OPERABILITY or reliability.

I REFERENCES 1. IEEE-308-1 978.

2. 10 CFR 50, Appendix A, GDC 17.

3. IEEE-485-1983, June 1983.

4. FSAR, Chapter 8.

5. Regulatory Guide 1.32, February 1977.

6. FSAR, Chapter 6.

7. FSAR, Chapter 15.

8. Regulatory Guide 1.93, December 1974.

9. IEEE-450-1975 and 1987.

10. Regulatory Guide 1.129, December 1974 I

Vogtle Units 1 and 2 B 3.8.4-9 Revision 2

DC Sources-Shutdown B 3.8.5 BASES ACTIONS A.1, A.2.1. A.2.2. A.2.3. and A.2.4 (continued) maintain or increase reactor vessel inventory, provided the required SDM is maintained.

Suspension of these activities shall not preclude completion of actions to establish a safe conservative condition. These actions minimize probability of the occurrence of postulated events. It is further required to immediately initiate action to restore the required DC electrical power subsystems and to continue this action until restoration is accomplished in order to provide the necessary DC electrical power to the unit safety systems.

The Completion Time of immediately is consistent with the required times for actions requiring prompt attention. The restoration of the required DC electrical power subsystems should be completed as quickly as possible in order to minimize the time during which the unit safety systems may be without sufficient power.

SURVEILLANCE SR 3.8.5.1 REQUIREMENTS SR 3.8.5.1 requires performance of all Surveillances required by SR 3.8.4.1 through SR 3.8.4.3. Therefore, see the corresponding Bases for LCO 3.8.4 for a discussion of each SR.

This SR is modified by a Note. The reason for the Note is to preclude requiring the OPERABLE DC sources from being discharged below their capability to provide the required power supply or otherwise rendered inoperable during the performance of SRs. It is the intent that these SRs must still be capable of being met, but the actual performance is not required.

REFERENCES 1. FSAR, Chapter 6.

2. FSAR, Chapter 15.

Vogtle Units 1 and 2 B 3.8.5-4 Rev sition 1

Battery Parameters I B 3.8.6 B 3.8 ELECTRICAL POWER SYSTEMS B 3.8.6 Battery Parameters I BASES BACKGROUND This LCO delineates the limits on battery float current as well as electrolyte temperature, level, and float voltage for the DC power I source batteries. A discussion of these batteries and their OPERABILITY requirements is provided in the Bases for LCO 3.8.4, "DC Sources-Operating," and LCO 3.8.5, "DC Sources-Shutdown." In addition to the limitations of this Specification, the Battery Monitoring and Maintenance Program also implements a program specified in Specification 5.5.19 for monitoring various battery parameters that is based on the recommendations of IEEE Standard 450-1995, "IEEE Recommended Practice For Maintenance, Testing, And Replacement of Vented Lead-Acid Batteries For Stationary Applications" (Ref. 1).

The battery cells are of flooded lead acid construction with a nominal specific gravity of 1.215. This specific gravity corresponds to an open circuit battery voltage of approximately 121.8 V for a 59 cell battery (i.e., cell voltage of 2.065 volts per cell (Vpc)). The open circuit voltage is the voltage maintained when there is no charging or discharging. Once fully charged with its open circuit voltage 2 2.065 Vpc, the battery cell will maintain its capacity for 30 days without further charging per manufacturer's instructions. Optimal long term.

performance however, is obtained by maintaining a float voltage 2.20 to 2.25 Vpc. This provides adequate over-potential which limits the formation of lead sulfate and self discharge. The nominal float voltage of 2.23 Vpc corresponds to a total float voltage output of 131.6 V for a 59 cell battery as discussed in the FSAR, Chapter 8 (Ref. 2).

APPLICABLE The initial conditions of Design Basis Accident (DBA) and SAFETY ANALYSES transient analyses in the FSAR, Chapter 6 (Ref. 3) and Chapter 15 (Ref. 4), assume Engineered Safety Feature systems are OPERABLE. The DC electrical power system provides normal and emergency DC electrical power for the diesel generators, emergency auxiliaries, and control and switching during all MODES of operation.

The OPERABILITY of the DC subsystems is consistent with the initial assumptions of the accident analyses and is based upon meeting the design basis of the unit. This includes maintaining at least one train of DC sources OPERABLE during accident conditions, in the event of:

(continued)

Vogtle Units 1 and 2 B 3.8.6-1 Revision 2

Battery Parameters I B 3.8.6 BASES APPLICABLE a. An assumed loss of all offsite AC power or all onsite AC power; SAFETY ANALYSES and (continued)

b. A worst case single failure.

Battery parameters satisfy Criterion 3 of 10 CFR 50.36 (c)(2)(ii). I LCO Battery parameters must remain within acceptable limits to ensure I availability of the required DC power to shut down the reactor and maintain it in a safe condition after an anticipated operational occurrence or a postulated DBA. Battery parameter limits are conservatively established, allowing continued DC electrical system function even with limits not met. I Additional preventative maintenance, testing, and monitoring

- performed in accordance with the Battery Monitoring and -- -

Maintenance Program are conducted as specified in Specification 5.5.19.

APPLICABILITY The battery parameters are required solely for the support of the I associated DC electrical power sources. Therefore, battery parameter limits are only required when the DC power source is I required to be OPERABLE. Refer to the Applicability discussion in Bases for LCO 3.8.4 and LCO 3.8.5.

ACTIONS A.1, A.2. and A.3 With one or more cells in one battery < 2.07 V, battery capacity may be reduced. Within 2 hours0.0833 days <br />0.0119 weeks <br />0.00274 months <br /> verification of the required battery charger OPERABILITY is made by monitoring the battery terminal voltage (SR 3.8.4.1) and of the overall battery state of charge by monitoring the battery float charge current (SR 3.8.6.1). This assures that there is still sufficient battery capacity to perform the intended function.

Therefore, the affected battery is not required to be considered inoperable solely as a result of one or more cells < 2.07 V, and continued operation is permitted for a limited period up to 24 hours1 days <br />0.143 weeks <br />0.0329 months <br />.

Since the Required Actions only specify "perform," a failure of SR 3.8.4.1 or SR 3.8.6.1 acceptance criteria does not result in this Required Action not met. However, if one of the SRs is failed the appropriate Condition(s), depending on the cause of the failures, is entered.

(continued)

Vogtle Units 1 and 2 B 3.8.6-2 Revi si on 1

Battery Parameters B 3.8.6 BASES ACTIONS B.1 and B.2 (continued)

Condition B addresses the case where battery A or B has float current

> 2 amps; or battery C or D has float current > 1 amp. This indicates that a partial discharge of the battery capacity has occurred. This may be due to a temporary loss of a battery charger or possibly due to one or more battery cells in a low voltage condition reflecting some loss of capacity. Within 2 hours0.0833 days <br />0.0119 weeks <br />0.00274 months <br /> verification of the required battery charger OPERABILITY is made by monitoring the battery terminal voltage. If the terminal voltage is found to be less than the minimum established float voltage there are two possibilities, the battery charger is inoperable or is operating in the current limit mode.

Condition A addressed charger inoperability. If the charger is operating in the current limit mode after 2 hours0.0833 days <br />0.0119 weeks <br />0.00274 months <br /> that is an indication that the battery has been substantially discharged and likely cannot perform its required design functions. The time to return the battery to its fully charged condition in this case is a function of the battery charger capacity, the amount of loads on the associated DC system, the amount of the previous discharge, and the recharge characteristic of the battery. The charge time can be extensive, and there is not adequate assurance that it can be recharged within 12 hours0.5 days <br />0.0714 weeks <br />0.0164 months <br /> (Required Action B.2). The battery must therefore be declared inoperable.

If the float voltage is found to be satisfactory but there are one or more battery cells with float voltage less than 2.07 V, the associated "OR" statement in Condition F is applicable and the battery must be declared inoperable immediately. If float voltage is satisfactory and there are no cells less than 2.07 V there is good assurance that, within 12 hours0.5 days <br />0.0714 weeks <br />0.0164 months <br />, the battery will be restored to its fully charged condition (Required Action B.2) from any discharge that might have occurred due to a temporary loss of the battery charger. A discharged battery with float voltage (the charger setpoint) across its terminals indicates that the battery is on the exponential charging current portion (the second part) of its recharge cycle. The time to return a battery to its fully charged state under this condition is simply a function of the amount of the previous discharge and the recharge characteristic of the battery. Thus there is good assurance of fully recharging the battery within 12 hours0.5 days <br />0.0714 weeks <br />0.0164 months <br />, avoiding a premature shutdown with its own attendant risk.

If the condition is due to one or more cells in a low voltage condition but still greater than 2.07 V and float voltage is found to be satisfactory, this is not indication of a substantially discharged battery and 12 hours0.5 days <br />0.0714 weeks <br />0.0164 months <br /> is a reasonable time prior to declaring the battery inoperable.

(continued)

Vogtle Units 1 and 2 B 3.8.6-3 Revis i on 1

Battery Parameters I B 3.8.6 BASES ACTIONS B.1 and B.2 (continued)

Since Required Action B.1 only specifies perform," a failure of SR 3.8.4.1 acceptance criteria does not result in the Required Action not met. However, if SR 3.8.4.1 is failed, the appropriate Condition(s),

depending on the cause of the failure, is entered.

C.1, C.2, and C.3 With one battery with one or more cells electrolyte level above the top of the plates, but below the minimum established design limits, the battery still retains sufficient capacity to perform the intended function.

Therefore, the affected battery is not required to be considered inoperable solely as a result of electrolyte level not met. Within 31 days the minimum established design limits for electrolyte level must be re-established.

With electrolyte level below the top of the plates there is a potential for dryout and plate degradation. Required Actions C.1 and C.2 address this potential (as well as provisions in Specification 5.5.19, Battery Monitoring and Maintenance Program). They are modified by a note that indicates they are only applicable if electrolyte level is below the top of the plates. Within 8 hours0.333 days <br />0.0476 weeks <br />0.011 months <br /> level is required to be restored to above the top of the plates. The Required Action C.2 requirement to verify that there is no leakage by visual inspection and the Specification 5.5.1 9.b item to initiate action to equalize and test in accordance with manufacturer's recommendation are taken from Annex D of IEEE Standard 450-1995. They are performed following the restoration of the electrolyte level to above the top of the plates.

Based on the results of the manufacturer's recommended testing the battery may have to be declared inoperable and the affected cell(s) replaced.

D.1 With one battery with pilot cell temperature less than the minimum established design limits, 12 hours0.5 days <br />0.0714 weeks <br />0.0164 months <br /> is allowed to restore the temperature to within limits. A low electrolyte temperature limits the current and power available. Since the battery is sized with margin, while battery capacity is degraded, sufficient capacity exists to perform the intended function and the affected battery is not required to be considered inoperable solely as a result of the pilot cell temperature not met.

(continued)

Vogtle Units 1 and 2 B 3.8.6-4 Revision I

Battery Parameters I B 3.8.6 BASES ACTIONS E.1 (continued)

With two or more batteries with battery parameters not within limits there is not sufficient assurance that battery capacity has not been affected to the degree that the batteries can still perform their required function, given that more than one battery is involved. With more than one battery involved, this potential could result in a total loss of function on multiple systems that rely upon the batteries. The longer completion times specified for battery parameters on a single battery not within limits are therefore not appropriate, and the parameters must be restored to within limits on at least three batteries within 2 hours0.0833 days <br />0.0119 weeks <br />0.00274 months <br />.

F.1 With one or more batteries with any battery parameter outside the allowances of the Required Actions for Condition A, B, C, D, or E, sufficient capacity to supply the maximum expected load requirement is not assured and the corresponding DC battery must be declared inoperable. Additionally, discovering a battery with one or more battery cells float voltage less than 2.07 V and float current greater than 2 amps for batteries A and B, or 1 amp for batteries C and D indicates that the battery capacity may not be sufficient to perform the intended functions. The battery must therefore be declared inoperable immediately. This condition is intended to apply when the battery is in the float mode. For example, if an individual cell is discovered below the 2.07 V limit, a possible corrective action would be to place the battery in the equalize mode. In this condition, the charger amperage is elevated and a measurement of 'float' current may be above the stated limits with an individual cell below the 2.07 V criteria. This is an expected condition; therefore, in this case, it is not appropriate to enter Condition F.

SURVEILLANCE SR 3.8.6.1 REQUIREMENTS Verifying battery float current while on float charge is used to determine the state of charge of the battery. Float charge is the condition in which the charger is supplying the continuous charge required to overcome the internal losses of a battery and maintain the battery in a charged state. The float current requirements are based on the float current indicative of a charged battery. Use of float current to determine the state of charge of the battery is consistent with IEEE-450 (Ref. 1). The 7 day Frequency is consistent with IEEE 450 (Ref. 1).

(continued)

Vogtle Units 1 and 2 B 3.8.6-5 Revision 1

Battery Parameters I B 3.8.6 BASES SURVEILLANCE SR 3.8.6.1 (continued)

REQUIREMENTS This SR is modified by a Note that states the float current requirement is not required to be met when battery terminal voltage is less than the minimum established float voltage of SR 3.8.4.1. When this float voltage is not maintained the Required Actions of LCO 3.8.4 ACTION A.1 are being taken, which provide the necessary and appropriate verifications of the battery condition. Furthermore, the float current limits of 2 amps for batteries A and B, and 1 amp for batteries C and D are established based on the nominal float voltage value and are not directly applicable when this voltage is not maintained.

SR 3.8.6.2 and SR 3.8.6.5 Optimal long term battery performance is obtained by maintaining a float voltage greater than or equal to the minimum established design limits provided by the battery manufacturer, which corresponds to 129.8 V at the battery terminals, or 2.20 Vpc. This provides adequate over-potential, which limits the formation of lead sulfate and self discharge, which could eventually render the battery inoperable. Float voltage in this range or less, but greater than 2.07 Vpc, is addressed in Specification 5.5.19. SRs 3.8.6.2 and 3.8.6.5 require verification that the cell float voltages are equal to or greater than the short term absolute minimum voltage of 2.07 V. The frequency for cell voltage verification every 31 days for pilot cell and 92 days for each connected cell is consistent with IEEE-450 (Ref. 1).

SR 3.8.6.3 The limit specified for electrolyte level ensures that the plates suffer no physical damage and maintains adequate electron transfer capability. The Frequency is consistent with IEEE-450 (Ref. 1).

SR 3.8.6.4 This Surveillance verifies that the pilot cell temperature is greater than or equal to the minimum established desigh limit (i.e., 60 0F). Pilot cell electrolyte temperature is maintained above this temperature to assure the battery can provide the required current and voltage to meet the design requirements. Temperatures lower than assumed in battery sizing calculations act to inhibit or reduce battery capacity.

The Frequency is consistent with IEEE-450 (Ref. 1).

(continued)

Vogtle Units I and 2 B 3.8.6-6 Revision 1

Battery Parameters I B 3.8.6 BASES SURVEILLANCE SR 3.8.6.6 (continued)

REQUIREMENTS A battery performance discharge test is a test of constant current capacity of a battery, normally done in the as found condition, after

-having been in service, to detect any change in the capacity. The test is'intended to determine overall battery degradation due to age and usage.

Either the battery performance discharge test or the modified performance discharge test is acceptable for satisfying SR 3.8.6.6; however, only the modified performance discharge test may be used to satisfy the battery service test requirements of SR 3.8.4.3.

A modified discharge test is a test of the battery capacity and its ability to provide a high rate, short, duration load (usually the highest rate of the duty cycle). This will often confirm the battery's ability to meet the critical period of the load duty cycle, in addition to determining its percentage of rated capacity. Initial conditions for the modified performance discharge test should be identical to those specified for a service test.

The modified discharge test may consist of just two rates; for instance, the one minute rate published for the battery or the largest current load of the duty cycle, followed by the test rate employed for the performance test, both of which envelop the duty cycle of the service test. Since the ampere-hours removed by a one minute discharge represents a very small portion of the battery capacity, the test rate can be changed to that for the performance test without compromising the results of the performance discharge test. The battery terminal voltage for the modified performance discharge test must remain above the minimum battery terminal voltage specified in the battery service test for the duration of time equal to that of the service test.

The acceptance criteria for this Surveillance are consistent with IEEE-450 (Ref. 9) and IEEE-485 (Ref. 3). These references recommend that the battery be replaced if its capacity is below 80% of the manufacturer rating. A capacity of 80% shows that the battery rate of deterioration is increasing, even if there is ample capacity to meet the load requirements. Furthermore, the battery is sized to meet the assumed cycle loads when the battery design capacity reaches this 80% limit.

The Surveillance Frequency for this test is normally 60 months. If the battery shows degradation, or if the battery has reached 85% of its expected life and capacity is < 100% of the manufacturer's ratings, the Surveillance Frequency is reduced to 12 months. However, if the battery shows no degradation but has reached 85% of its expected (continued)

Vogtle Units I and 2 B 3.8.6-7 Revision I

Battery Parameters I B 3.8.6 BASES SURVEILLANCE SR 3.8.6.6 (continued)

REQUIREMENTS life, the Surveillance Frequency is reduced to only 24 months for batteries that retain capacity 2 100% of the manufacturer's ratings.

Degradation is indicated, according to IEEE-450 (Ref. 9), when the battery capacity drops by more than 10% relative to its capacity on the previous performance test or when it is 2 10% below the manufacturer rating. These Frequencies are similar to those recommended by IEEE-450 (Ref. 9) and require that testing be performed in a conservative manner relative to the battery life and degradation which in turn will ensure that battery capacity is adequately monitored and that the battery remains capable of performing its intended function.

This SR is modified by a Note. The reason for the Note is that performing the Surveillance would perturb the electrical distribution system and challenge safety systems.

Credit may be taken for unplanned events that satisfy this SR.

Examples of unplanned events may include:

1. Unexpected operational events which cause the equipment to perform the function specified by this Surveillance, for which adequate documentation of the required performance is available; and

2. Post Corrective maintenance testing that requires performance of this Surveillance in order to restore the component to OPERABLE, provided the maintenance was required, or performed in conjunction with maintenance required to maintain OPERABILITY or reliability.

REFERENCES 1. IEEE-450-1995.

2. FSAR, Chapter 8.

3. FSAR, Chapter 6.

4. FSAR, Chapter 15.

Vogtle Units 1 and 2 B 3.8.6-8 Revision 0