ML20198E314

Proposed Tech Specs Re Auxiliary Bldg & Svc Water Bldg Battery Surveillances

ML20198E314
Person / Time
Site:	Farley
Issue date:	12/30/1997
From:	SOUTHERN NUCLEAR OPERATING CO.
To:
Shared Package
ML20198E295	List: ML20198E289 ML20198E314
References
NUDOCS 9801090066
Download: ML20198E314 (24)

Text

. v ATTACHMENT I i

i FARLEY NUCLEAR PLANT TECilNICAL SPECIFICATIONS CilANGE REQUEST AUXILIARY BUILDING & SERVICE WATER BUILDING BATTERY SURVEILLANCES i

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' ELECTRICAL POVER SYSTEMS

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AUXILIARY BUILD!NC 0.C. O!STRIBUTION - OPERATING SURVEILLANCE REQUIREMENTS (Continued)

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The battery capacity is adequate to supply and maintain in OPERABLE status all of the actual emergency loads for h:::: rh: :h: 5::::: -!: eubj:::ed t: ; b ::::y

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At least once per 60 months by verifying that the battery capacity is ut least 80% of the manufacturer's rating when subjected to a purformance dischargo test. Once per 60 month interval, this performance discharge test.iny be performed in lieu (I the battery service test per 4.8.2.3.2.c.5.

Atleastoncephe18 months,performancedischargetestof e.

battery capacity shall be given to any battery that shows signs of degradation or has reached 17 years or 85% of the service life expected for the application, whichever coees first. Degradation is indicated when the battery capacity drops more than 10% of rated capacity fro.i its average on previous performance tests, or is below 70% of the manufacturer's rating.

the design load profile described in the Final Safety Ar.alysis Report, Section 8.3.2, by subjecting the battery to a service test.

4 TARLET-UNIT 1 3/4 8-9(a)

AMENDMENT NO. 57, S4

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• ELECTRICAL POVER SYSTEMS l

4 51RVICE VATER BUILDING D.C. DISTRIBUTION OPERATING SURVEILLANCE REQUIREMENTS (Continued) 2.

There is no visible excessive corrosion at either terminals or connectors, or the cor'nection resistance of these iteas is less than or equal to 1500 alcrohas from post to post *, and 3.

The average electrolyte temperatures of ten of the connected cells deviate less than or equal to 5'T from each other**.

At least once per 18 months by verifying that:

c.

1.

The cells, cell plates and battery racks show no vi,;ual indication of physical damage or abnormal deterioration, 2.

The cell-to.aell and terminal connections are clean, tight, and coated with anti-corrosion material, 3.

The resistance of each cell-to-cell and tersanal connection is-less than or equal to 1500 microhns from post to post *, and 4

The battery charger vill supply at least 3 aspeces at greater than or equal to 125 volts for at least 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br />.

5.

The $attery capacity is adequate to supply and maintain in OPERABLE status all of the actual emergency loads for

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For any connection resistance determined to be greater th 1500 microhns from post to post, the battery may be considered operable provided that within 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> the connection resistance is restored to less than or equal to 1500 microhns from post to post.

If a deviation greater thk 5'T is determined, the battery may be considered operabic provided that within 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> the temperature deviation is corrected.

FARLET-UNIT 1 3/4 6-13 AMENDMENT NO./57, 8 4 the design load profile described in the Final Sa'fety Analysis Report, Section 8.3.2, by subjecting the battery to a service test.

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ELECTRICAL POWER SYSTEMS i

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i AUXJLIARY EtJILDING D.C. DISTRIBUTION - OPERATING i

3 SURVEILLANCE REQUIREMENTS (Continued) i 5.

The battery capacity is adequate to supply and maintain in OPERABLE ntatus all of the actual emergency loads for the design. load profile described in the Final Safety l

Analysis Report, section 8.3.2, by subjecting the battery to a service test.

d.

At least once per 60 months by verifying that the battery

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capacity is at least 80% of the manufacturer's rating when subjected to a performance discharge test. Once per 60 montu interval, this performarce discharge test may be performed in l

lieu of the battery service test per 4.8.2.3.2.c.5.

e.

At least once per 18 months, performance discharge test of battery capr. city shall be given to any battery that shewb signs of degradation or has reached 17 years or 85% of cho service life expected for the application, whichever comes first. DegradTtion is indicat6d when the battery capacity drops more than 10% of rated capacity from its average on previous performance tests, or is below 90% of the manufacturer's rating.

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FARLEY-UNIT 1 3/4 8-9(a)

'AKENDKENT NO.

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2.

e KLICTRICAL POWSR.SYCTEMS RIBylg]_3ATER BUILDING D.C. DISTRIBUTION - OPERATIlfg SURVEILLANCE REQUIREMENTS (Centinued) 2.

There is no visible excessive corrosion at either terminals or connectors, or the connection resistance of these items is less than or equal to 1500 microhms from post to post *, and 3.

The average electrolyte temperatures of ten of the connected cells deviate less than or equal to 5'T from each other**.

c.

At least once per 18 months by verifying that:

1.

The cells, cell plates and battery racks show no visual indication of physical damtge or abnormal deterioration, 2.

The cell-to-cell and terminal connections are cienn, tight, and coated w!th anti-corrosion material, 3.

The resistance of each cell-to-cell and terminal connection is less than or equal to 1500 microhms from post to post *, and 4.

The battery charger will supply at least 3 amperes at greater than or equal to 115 volts for at least 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br />.

5.

Tha battery capacity is adequate to supply and maintain in OPERABLE status all of the actual emergency loads for the de-ign load profile described in the Final Safety Analysis Report, Section 8.3.2, by subjecting the battery to a service test.

For any connection resistance determined to be greater than 1500 microhms from post to post, the battery may be considered operable provided that within 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> the connection resistance is restored to less than or equal to 1500 microhms from post to post.

• • If a deviation greater than 5'F is determined, the battery may be considered operable provided that within 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> the temperature deviation is corrected.

FARLEY-UNIT 1 3/4 8o13 AMENDMENT NO.

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FNP Unit 2 Technical Specifications Electrical Power Systems Chanced Pages lidLZ Revision Page 3/4 812(a)

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ELECTRICAL P0'vT.R SYSTEMS AtlXILIARY BtJILDING D.C. DISTRIBUTION - OPERATING StJRVEILLANCE REQUIRIME.Vr5 (Continued) 3.

The battery capacity is adequate to supply and maintain I' -in OPERABLE status all of the actual emergency loads for h: r: th;n-th; b:::::y !: :ebjected :: : be+:::y CC ddi?

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d.

At least once per 60 months by verifying that the battery capacity is at least 80% of the manufacturer's rating when subjected to a performance discharge test. Once per 60 month interval, this performance discharge test may be performed in lieu of battery service test per 4.8.2.3.2.c.5.

At least once per 18 months, performance discharge test of e.

battery capacity shall be given to any battery that shovs signs of degradation or has reached 17 years or 85% of the service life expected for the application, whichever comes first. Degradation is indicated when the bettery capacity drops more than 10% of rated capacity from its average on previous performance tnsts, or is belov 90% of the manufacturer's rating, the design load profile described in the Final Safety Analysis Report, Section 8.3.2, by subject 4.ng the battery to a service test.

a FARLEY-UNIT 2 3/4 8-12(a)

AMENDMENT NO. 50. 77

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1 ELECTRICAL POVER SYSTEMS SERVICE VATER BUILDING D.C. DISTRIBUTION - OPERATINC SURVEILLANCE REQUIREMENTS (Contit uod) 2.

Thete is no visible excessive corrosion at either-terminals or connectors, or the connectis sistance of these items is less than or equal to 1500 ::. ohms from post to post *, and 3.

The average electrolyte temperatures of ten of the connected cells deviate less than or equal to 5'T fros each other**.

At least once per 18 months by verifying that:

c.

1.

The cells, cell plates and battery racks show no visual indication of physical damage or abnormal deterioration, 2.

The cell-to-cell and terminal connections are clean, tight, and coated with anti-corrosion material.

3.

The resistance of each cell-to-cell and terminal connection is less than er equal to 1500 microhns free post to post *, and 4.

The battery charger vill supply at least 3 asperes at greater than or equal to 125 volts for at least 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br />.

5.

The battery capacity is adequate to supply and maintain in OPERABLE status all of the actual emergency loadt for g

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For any connection resistance determined to be greater than 1500 microhns froa post to post, the battery ray be considered operable provided that within 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> the connection resistance is restored to less than or equal to 1500 microhns from post to post.

If a deviation greater than 5'r is determined, the battery any be considered operable provided that within 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> the temperature

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Hj Z 6's FARLET-UNIT 2 3/4 8-16 AMENDMENT NO 50, 77 the design load profile described in the Final safety Analysis Report, Section 8.3.2, by subjecting the battery to a service test.

1

ELECTRIGAL POWER SYSTEMS AUXILIARY BUILDINO D.

C.

DISTRIBUTION - OPERATING SURVEILLANCE REQUIREMENTS (Continued) 5.

The battery capacity is adequate to supply and mair.tain in OPERABLE status all of the actual emergency loads for the design load profile described in the Final Safety Analysis Report, Section 8.3.2, by subjecting the battery to a service test.

d.

At least once per 60 months by verifying that the battery capacity is at least 80% of the manufacturer's rating when subjected to a performance discharge test. Once per 60 month interval, this performance discharge test may be performed in lieu of battery service test per 4.8.2.3.2.c.5.

e.

At least once per 18 months, performance discharge test of battery capacity shall be given to any battery that shows signe et degradation or has reached 17 years or 65% of the service life expected-for the application, whichever comes first. Degradation is indicated when the battery capacity drops more than 10% of rated capacity from its average on previous performance tests, or is below 90% of the manufacturer's rating.

FARLEY-UNIT 2 3/4 8-12(a)

AMENDMENT NO.

ELICTRIcAL POWER SYSTEMS SERVICE WATER BUILDING D.C. DISTRIBUTION - OPERATING SURVEILLANCE REQUIREMENTS (Continued) 2.

There is no visible excessive corrosion at either terminals or connectors, or the connection resistance of these items is less than or equal to 1500 microhms from post to post *, and 3.

The average electrolyte temperatures of ten of the connected cells deviate less than or equal to 5*F from each other**.

c.

At least once per 18 months by verifying that:

1.

The cells, cell plates and battery racks show no visual indication of physical damage or abnormal deterioration, 2.

The cell-to-cell and terminal connections are clean, tight, and coated with anti-corrosion material, 3.

The resistance of each cell-to-cell and terminal connection is less than or equal to 1500 microhms from post to posta, and 4.

The battery charger will supyAy at least 3 amperes at greater than or equal to 125 volts for at least 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br />.

5.

The battery capacity is adequate to supply and maintain in OPERABLE status all of the actual emergency loads for the design load profile described in the Final Safety Analysis Report, Section 8.3.2, by subjecting the battery to a servies test.

For any connection resistance determined to be greater than 1500 microhms from post to post, the battery may be considered operable provided that within 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> the connection resistance is restored to less than or equal to 1500 microhms from post to post.

If a deviation greater than 5*F is determined, the battery may be considered operable provided that within 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> the temperature deviation is corrected.

FARLEY-UNIT 2 3/4 8-16 AMENDKENT NO.

ATTACilMENT 11 SAFLTY ANALYSIS JOSEPil M. FARLEY NUCLEAR PLANT AUXILIARY BUaDING & SERVICE WATER BUILDING DA1TERY SERVICE TEST TECIINICAL SPECIFICATIONS CIIANGE

p SAFETY ANALYSIS JOSEPH M. FARLEY NUCLEAR PLANT AUXILIARY BUILDING & SERVICE WATER BUILDING BATTERY SERVICE TEST TECilNICAL SPECIFICATIONS CHANGE AUXILIARY BUILDING BA'ITERY SURVEILLANCE CtlANGE Intrgluction in response to Unresolved item (URI) 50-348; 50 364/97 201 19 and Notice of Violation VIO 50-3 "t; 50-364/97 11-07, Southern Nuclear Operating Company (SNC) proposes to change Farley Nuclear Pim,t (FNP)

Units I and 2 Technical Specifications. Specifically, TechnLal Specification 4.8.2.3.2.c.5 for the Auxiliary Building (AB) Batteries will be revised by replacing the battery individual cell voltage (ICV), which is presently the only voltage criterion, with a reference to load profiles described in the FSAR which will include the specific minimum battery terminal voltages and ICV criteria, ne proposed char:ge is comistent with NUREO 1431, Revision 1," Standard Technical Specifications Westinghouse Plants."

9 Ilgkuround The FNP Units 1 and 2 AB 125VDC Distribution Systems are designed to prmide safety-related and nonsafety related electrical power for control of plant equipment, vital 120 volt AC bus inverters and emergency lighting during all modes of opcmtion. Each system includes batteries, battery chargers, DC switchboards, distribution panels, interconnecting cabling and monitoring instrumentation. Each system is separated into two independent and redundant 125VDC electrical trains (A and B) Each battery has 60 individual lead acid cells connected in series to provide a nominal voltage of approximately 125VDC when fully charged and open circuited. He DC power for control of plant equipment is normally supplied by the battery chargers. Each battery is connected in parallel with a charger which normally operates in "flo.it" at 132VDC to maintain its respective battery fully charged and therefore at optimum standby capacity.

He ba:teries provide uninterruptible power to safety-related equipment during design basis events including Loss of Offsite Power (LOSP) and LOSP combined with a less of Coolant Accident (LOCA). He capacity required of the batteries during such scenarios is to supply DC loads from initiation of LOSP until battery chargers are re-energized (within approximately 40 seconds) by the emergency diesel generators. For FNP there is no design basis accident scenario where the batteries have to provide LOSP or LOSP/LOCA loads for a period of greater than one minute without charger support. The battery design basis accident load current profile is 500 amperes for 1 minute.

While not a design basis requirement, the batteries are also capable of supporting automatic start and loading of the diesel generators and then supplying required safety-related DC loads for 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br /> assuming a battery charger f ailure coincident with a design basis event. For such cases, the battery current load profile is 500 amperes for 1 minute followed by 350 amperes for the next 119 min'.ites. This load profile is presented in the FNP FSAR Section 8.3.

Presently FNP Units I and 2 Technical Specification 4.8.2.3.2.c.5 requires senice tests on the batteries at 18

'nonth intervals to demonstrate their capability to provide electrical power to required loads. For this surveillance, the Technical Specifications specify that battery ICVs must be greater than or equal to 1.75 volts, his ICV criterian is included in the FNP surveillance test procedures. He FNP test procedures also list an Engineering Acceptance Criterion of 110 or t il volts (depending on the specific battery) for overall temenal voltage. Engineering determined these minimum voltages based upon the voltage required to ensure operation of LOSP or LOSP/LOCA loads plus margin to allow for future additional loads and the voltage expected after the battery has been subjected to the 120 minute FSAR load profile.

A1T II-1

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During the FNP 1997 A&E Audit, the NRC identified an issue pertalmng to the FNP AB battery testing (refetence NRC Design inspection Report Nw. 50 348/97-201 and 50-364/97-201, dated May 13,1997, URI 201 19). - Specifically, the Engineering Acccptance Criteria of 110 and i l l volt terminal voltage for the 60 cell batteries equates to ICVs of 1.83 and 1.85 volts respectively. These values are 0.08 and 0,10 of a volt above the Technical Specifications ICV criterion of 1.75 volts. As such, the present Technical Specifications requirement is considered to be less conservative than the design requirement. To disposition this UR1, FNP proposes to change the Technical Specifications. This safety analysis provides the basis for the proposed change.

Present Technical Specifications. FS AR and EngineeringJyting Reauirements FNP Units I and 2 Technical Specifications currem'y state the following.

4.8.2.3.2 Each 125 volt D.C. battery bank and charger shall be demonstrated OPERABLE:

c. At least once per 18 months by verifying that:

5. The battery capacity is adequate to supply and maintain in OPERABLE status all of the actual emergency loads for 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br /> when the battery is subjected to a battery service test or the individual cell voltage does not decrease below 1.75 volts when the battery is subj:cted to the equivalent load profile based on anticipated breaker operniom required during loss of-offsite (LOSP) and loss of-cook.nt accident (LOCA) conditions as described in the Final Safety Analysis Report.

FS AR Section 8.3.2.1.1.1'

.ently states " V The service test for the batteries w i m..ned using this Icad profile which envelopes both the normal and design basis accident loao profiles, Iime Loasi 0 to 1 min.

500A 1 to 120 min.

350A

'lle FNP Technical Specifications presently list ICVs of 1.75 volts as a single acceptance criterion to establish battery operability and do not specify battery terminal voltage as an acceptance criterion. The ICV value is an industry typical minimum voltage used in the etpacity rating of batteries, i.e.,950 ampre-heurs at the 8 hour9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> I.scharge rate to a mmimum 1.75 volts per cell. The FNP FSAR lists only the battery soad current profile and duntion for a design basis accident assuming failure of the battery charger. Engineering calculation E-144, "Detern ination of Battery Capacity Margins for Adequacy of Voltage te Safety-Related Componeats for Varic a Load Profiles," establishes the minimum banery terminal voltages necessary to ensure electrical operation of plant equipment. To provide foi margin and allow for future load addition, the calculation specifies 11i mits for Unit 1 Batteries I A and 1B and 110 volts for Unit 2 Batteries 2A and 2B a..he minimum post-test battery terminal voltages. These test voltages are incorporated in Farley surveillance procedures FNP-1(2)-STP-905.1 as Engineering Acceptance Criteria. The ICV of 1.75 volts is also listed in tLese surveillance procedures as the Technical Specification Acceptance Criterion.

ATT II-2

f bposed Channes and Technical Basis for the Chances SNC'peoposes to revise the FNP Technical Specifications by removing the ICV acceptance criterion and replacing it with a reference to the load profile specified in the FSAR. He current FSAR load profile discussion will be augmented with both minimum acceptable battery terminal voltages and minimum ICV of 1.75 volts. Specifying both voltage limits in the FSAR assures that any changes to the limits or the load profile are properly evaluated to ensure operability cf wnnected loads as required by the Technical Specifications. He surveillance procedures wiP. continue to require that both acceptance criteris must be satisfied (or evaluated) to demonstrate battery aperability. Rese changes will provide assurance that battery terminal voltage along with ICVs are adequate to maintain emergency loads in operable status.

The following change to Technical Specifications 4.8.2.3.2.c.5 is proposed.

4.8.2.3.2 Each 125-volt D.C. battery bank and charger shall be demonstrated OPERABLE:

c. At least once per 18 months by verifying that:

5. He battery capacity is adequate to supply and maintain in OPERABLE status all of the actual emergency loads for the des:gn load profile described in ne Final Safety Analysis Report, Section 8.3.2, by subjecting the battery to a service test.

In oider to consolidate the acceptance criteria in one location directly referenced by Technical Specification 4.8.2.3.2.c.5, FSAR Section 8.3.2 will be nevised and augmented as follows.

Iime L9Ad 0 to 1 min.

500A 1 to 120 min.

350A The ser. ice test for the battenes wit be performed using the load profile above and test voltages below which envelope both the normal and design basis accident load profiles.

To assure the minimum vehge requirement for each of the connected emergency loads is satisfied, the battery terminal voltage at the end of each lead profile test intervat shall be greater than or equal to the fobowing.

Battery 1st Minute 120th Minute lA 112V 11IV IB 114V 11IV 2A ll3.4V 110V 2B ll3.4V 110V Test voltage limits listed above are great:r than the mmimum reqGred design voltage and provide acceptable margin to support futur;. design load additions or variations. b the event post-test terminal voltages are lower, mmparison of actual values to minimum acceptable design voltages is recuired to determine whether the battery is capable of satisfactorily supplying design loads. In c.ddition, all 4

hidividual Cell Voltages (ICVs) at the end of the test should be greater than or equal to 1.75 volts.

A'IT II - 3

While overAl battery termmal voltage may be acceptable, single (or multiple) ICVs ofless than 1.75 volts are indicative of degraded cell (s) that must be evaluated for corrective action or potential replacement.

"Ihe proposed change to tne FNP Technical Specifications makes the battery surveillance requirement consistent with the #cstinghouse Standard Technical Specifications (NUREG 1431, Revision 1). He supporting FS AR revision incorporates the minimum battery tenninal voltages for testi;g purposes to ensure equipment operation as determined by engineering calculation E-144, ne FSAR resision also incorporates the ICV of 1.75 volts to preclude placing a battery back in senice with a degraded cell without evaluating overall battcry capacity or replacing the cell. The associated test procedures will also be clarided to ensure a battery not meeting either acceptance criteria receives engineering evaluation of acceptability or corrective action prior to being placed back in senice.

Conclusion /SummaO' He proposed change to FNP Technical Specifications addresses and resolves the issue documented by URI

$0 348 and 364/97E' He change to the present FNP Units I and 2 Technical Specification 4.8.2.3.2.c.5 removes the single battery ICV acceptance criteria of 1.75 volts and replaces it with a reference to the battery load profile in FSAR Section 8.3.2. The present FSAR load profile which specifies load current and duration will be expanded to include the acceptance criteria for both minimum battery termmal voltage (to ensure load operability) and ICVs (to ensure cell limits are not exceeded). Finally, the current suneillance procedures will continue to ensure both the minimum battery termmal voltage and ICV acceptance criteria tenninology. These changes will eliminate the possibility that a battery could be declared operable because post test ICVs are acceptable when overall tenninal voltage is less than required to assure safety-related equipment operability.

SERVICE WATER BUILDING BA'ITERY SURVEILLANCE CifANGE Introduction In conjunction with the change to the AB Battery surveillances discussed above, SNC proposes to change FNP Units I and 2 Teclu:ical Specifications 4.8.2.5.2.c.5 fo the Senice Water Building (SWB) Batteries.

Specifically, these surveillance requirements will be revised replacing the ICV criterion of 1.75 volts with a rekrence to the FSAR that will include a minimum termmal voltage and minimum ICV criteria. The proposed t,.. age will make the surveillance requirements for the SWB Batterier consistent with those proposed above the AB Batteries and NUREG 1431, Revision 1, " Standard Technical Specifications Westinghouse Plants."

Background

He FNP SWB 125 VDC Distribution System is designed to provide electrical power for safety-related and nonsafety-related Isds applied from Senice Water Intake Structure DC distribution panels during all modes of plant operation. He system includes two independent and redundant electrical trams (A and B). Each train includes two batteries, two battery chargers, two distnbution panels (one for each FNP unit), interconnecting cable and monitoring instrumentation. One battery and charger from each train is nonnally aligned to supply thst train's distribution panels for both units through a transQr s., itch. The other batteries and chargers from each train are maintained energized and in t,tandby. The standby batteries and chargers can be placed in senice by operation of the transOr switches. Each battcry has 60 individual lead-acid cells connected in series tn provide a nominal voltage of approximat ay 25VDC when fully charged and open circuited. The DC power for control of SWB equipm,nt is norma'ly supplied by the battery chargers aligned at that time. Each battery is connected in parallel with a charger that normally operates in " float" at 132VDC to maintain its respective battery fully charged and therefore at optimum standby capachy.

A'IT 11 - 4

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The SWD batteries provide adequate capacity to supply connected vital loads and support safe reactor shutdown wi.thout a battery charger until AC power is restored. He ba'.teries are sized to supply the loads for two hours without charger support. The dnign load profile for tl.e batteries is to supply 30 amps for I minute followed by 3 amps for the following 119 minutes.

Presently, FNP Units I and 2 Technical Specification 4.8.2.5.2.c.5 requires senice tests on the batteries at 18 month intervals to demonstrate their capability to provide electrical power to required loads. For these surveillances, the Technical Specifications specify that battery ICVs must be greater than or equal to 1.75 volts. This ICV value is included in the FNP surveillance test procedures as the only acceptance criterion. A 60 cell battery with all ICVs at 1.75 volts results in an overall battery temuna' voltage of 105 volts. This voltage exceeds the minimum supply voltage required by the connected DC powered equipment. Engineering

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has determined that the voltage drop from the battery terminals to the connected loads for these batteries is rninimal. Herefore, a SWB battery tenninal voltage of 105 volts is adequate to assure operability of all loads.

The batteries provide uninterruptible power to safety-related Senice Water System equipment control circuits during design basis events incleding Loss of Offsite Power (LOSP) and LOSP combined with a Loss of Coolant Accident (LOCA). The capacity required of the batteries during such scenarios is to supply DC loads

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from initiation of LOSP until battery chargers are re-energized (within approximately 40 seconds) by the emergency diesel generators. For FNP there is no design basis accident scenario where the batteries have to provide LOSP or LOSP/LOCA loads for a period ofgreater than one minute without charger support. The battery load current for the first minute following initiation of LOSP is 30 amperes.

K The batteries are also capable of supplying required safety-related DC loads for 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br /> assuming a battery 1

charger failure coincident with a design basis event. For such cases, the battery current load profile is 30 amperes for 1 minute followed by 3 amperes for the next 119 minutes. This load profile is presented in the FNP FSAR Section 8.3.

He present acceptance criterion for the senice test surveillance is conservative; however, it only considers ICVs to determine battery operability. It is therefore possible that one or more post test ICVs could drop to less than 1.75 volts while battery terminal voltage remains greater than 105 volts required to ensure component operability. Such an instance would require declaring the battery inoperable when it remained capable of perfomung its design function. It is therefore desired to add battery terminal voltage as an additional acceptance criterion for these surveillances. His will permit evaluation of battery operability based on ability to provide adequate voltage to the loads while corrective action for potentially degraded cells is pursued. As such and in order to make the SWB battery surveillance requiremer.t consistent with the AB battesy requirement, FNP proposes to change the Technical Specifications. His safety analysis pro 5 ides the basis for the proposed change.

Present Technical Specifications. FS AR and Testina Reauirements FNP Units I and 2 Technic 91 Specifications currently state the following.

4.8.2.5.2 Each 125-volt D.C. battery bank and charger shall be demonstrated OPERABLE:

c. At least once per 18 months by verifying that:

5. The battery capacity is adequate to supply and maintain in OPERABLE status all of the actual emergency loads for 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br /> when the battery is subjected to a battery senice test or the individual cell voltage does not decrease below 1.75 volts when the battery is subjected to the equivalent load profile based on anticipated brcJer operations r quired during loss-of-offsite (LOSP) and loss-of-ATT II - 5

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7 coolant accidant (LOCA) conditions as deuribed in the Final Safuy Analysis i

Report.

FSAR Section 8.3.2.1.1.2 eurrently states the followmg Service Water 8bilAa= - he service water building safety-related station batteries are sized in accordance with the methodology contamed in section 6 oflEEE 485-1983. De batteries are sized to

. deliver, as a mmimum, the following loads in the order indicated without the battery voltage dropping below 1.75 V per cel', considering a mmimum electrolyte temperature of 35'F and an aging factor of

= 25 percent. The load cycles envelop the de load requirements under all condidons.

Order in which Current Duration Loads are Anolied

_fA)__

(mm) 1 30 O to i c

'2 3

I to 120 he load consists pri.narily of the de operated switchgear controls. De bst:eries have a capac;ty of 73 A-h br;cd on an 8-h discharge rate to 1.75 V per cell. Er.ch battery has adequate storage capacity.

to carry its loads without charger support for a period of at least 2 h.

He FNP Technical Specifications presently list ICVs of 1.75 volts as a single acceptance criterion to establish battery operability and do not specify battery terminal voltage as an acceptance criterion. He ICV value is'an industry typical minimum voltage used in the capacity rating of batteries, i.e.,950 ampere-hours at the 8 hour9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> discharge rat: to a minimum 1.75 volts per cell. He FNP FSAR lists only the battery load current and -

duration for a design basis accidert assuming failure of the battery charger. Engineering calculation SE '

1470-1, " Voltage Drop in DC System - Senice Water System," establishes the maximum voltage drop to battery loads based on load ampacity and cable resistance. The voltage drop to battery loads is small. Due to the minimal voltage drops, a nurumum battery terminal voltage of 105 volts is adeouate to assure operability of all components.

E Proposed i j aes and Technical Basis for the Channes SNC proposes to revise the FNP Technical Specifications by removing the ICV acceptance criterion and -

replacing it with a reference to the load profile specified in ae FSAR. The current FSAR load profile discussion will be augmented with both minimum acceptable battery termmal voltage and minimum ICV of 1.75 volts. Specifying both ve rage limits in the FSAR assures that any changes to the limits or the load a

profile are properly evaluated to c..sure operability of connected loads as required by the Technical -

Specifications. The surveillance procedures will require that both acceptance criteria be satisfied or an

' engineering evaluation performed to demonstram battery operability. These changes will provide assurance that battery termmal voltage along with ICVs are adequate to maintain emergency lands i s operable status.

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He following change to Technical Specifications 4.8'.2.5.2.c.5 is proposed.

4.8.2.5.2-Each 125 volt DC Battery bank and charger shall be demonstrated OPERABLE:-

c. At least once per 18 months by verifying that:-

' 5. He battery capacity is adequate to supply and maintain in OPERABLE status all of the actual emergency loads for the design load profile described in the Final Safety Analysis Report, Section 8.3.2, by subjecting the battery to a senice test.

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In order to consolidate the, acceptance criteria in one location directly referenced by Technical Specifibation 4.8.2.5.2.c.5., FSAR Section 8.3.2 will be revised and augmented as follows.

8.3.2.1.1.2 Senice Water Building - ne Senice Water Building safety-related station batteries are sized in accordance with Section 6 of IEEE 485 1983 for operation at a minimum electrolyte temperatt.re of 35'F and including an aging factor of 25 percent. he batteries have a capacity of 75 amp-hours based on an 8-hour discharge rate to 1.75 volts per cell. The battery load primarily includes switchgear controls and indication.- Each battery has adequate storage capacity to carry its load without charger support for a period of at least 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br />.

Battery termmal voltage shall remain greater than or equal to 105 volts r r d ICVs shculd remain greater than or equal to 1.75 volts when the batteries are subjected to a senice test with the load profile below which envelops the load requirements un6r all conditions.

i Iimt Imd 0 to 1 minute 30 Amps 1 ta 120 minutes 3 Amps Test voltage limits listed above are greater than the minimum required design voltage and provide acceptable margin to support future design load additions or variations. In the event post test tentdnal voltages at s lower, comparison of actual values to muumum acceptable design voltages is required to q

de* ermine whether the battery is capable of satisfactorily supplying design loads. In addition, all h

Individual Cell Voltages (ICVs) at the end of the test should be greater than or equal to 1.75 volts.

Whi'e overall battery terminal voltage may be acceptable, single (or multiple) ICVs ofless than 1.75 vohs are indicative of degraded cell (s) that must be evaluated for corrective action or poter.tial replacement.

The proposed change to the FNP Technical Specifications makes the SWB battery surveillance requirement consistent with the Westinghouse Standard Technical. recifications (NUREG 1431, Revbion 1). He supporting FSAR revision incorporates the minimum battery termmal voitage for testing purposes to ensure equipment opemtion as determhed by engineering calculation SE-89-1470-1. He FSAR revision also incorporates the ICV of 1.75 volts to preclude placing a battery back in senice with a potentially degraded cell without evaluating overall battery capacity and taking corrective action. The associated test procedures will also be enhanced to ensure a battery not meeting either acceptance c.iterion receives engineering evaluation of acceptability or corrective action prior to being placed back in senice.

Conclusion / Summary he proposed change to Units I and 2 FNP Techn' cal Specifications Suncillance Requirement 4.8.2.5.2.c.5 makes it consistent with Surveillance Requirement 4.8.2.3.2.c.5 which is also proposed for revision to address the issue docun.ented by URI 50-348 and 364/97-201-19 and VIO 50-348i 50-364/97-11-07 The change to 4.8.2.5.2.c.5 removes the single battery ICV acceptance criteria of 1.75 volts and replaces it with a reference to the battery load profile in FSAR Section 8.3.2. The present FSAR load profile which specifies load current and duration will be expanded to include the acceptance criteria for both muumum battery temtinal voltage (to ensure load operability) and ICVs (to ensure cell limits are not exceeded). Finally, the current sunei: lance procedures will be revised to include both the mmimum battery terminal voltage and IC V acceptance criteria.

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V ATTACHMENT ill--

10 CFR 50.92 SIGNIFICANT HAZARDS EVALUATION.

JOSEPH M. FARLEY NUCLEAR PLANT

' ALT (ILIARY BUILDING & SERVICE WATER BUILDING BATTERY SERVICE TEST TECHNICAL SPECIFICATIONS CHANGE I

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10 CFR 50,92 SIGNIFICANT HAZARDS EVALUATION JOSEPl{ M. FARLEY NUCLEAR PLANT AUXILIARY BUILDING & SERVICE WATER BUILDING BATTERY SERVICE TEST TECHNICAL SPECIFICATIONS CHANGE As required by 10 CFR 50.91 (a)(1), an analysis is provided to demonstrate that the proposed license amendment revising Technical Specifications Suiveillances 4.8.2.3.2.c.5 and 4.8.2.5.2.c.5 does not involve significant hazards consideration.

Proposed Changes The proposed changes to the Farley Nuclear Plant (FNP) Units 1 and Unit 2 Technical Specifications Surveillances 4.8.2.3.2.c.5 (Auxiliary Building Batteries) and 4.8.2.5.2.c.5 (Service Water Building Batteries) remove the existing single acceptance criterion of 1.75 volt minimum indisidual cell voltage

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(ICV) and replaces it with a reference to the battery load profiles specified in Final Safety Analysis Report (FSAR) Section 8.3.2. The prcposed Technical Specifications changes are consistent with the

- Westinghouse Standard Technical Specifications (NUREG 1431, Revision 1) surveillance related to battery testing. In support of this change, the Faricy FSAR will tw revised. The FSAR revision will expand the load profile dermition to include both minimun battery termmal voltages (to assure adequate voltage to emergency loads) and ICVs greater than 1.75 volts (to assure individual cells are not less than acceptable limits). FNP surveillance test procedures will be revised to clarity that both minimum battery terminal voltages and ICVs are required acceptance criteria.

Backcround During the FNP 1997 A&E Inspection, the NRC identified an issue with FNP Technical Speci.ication 4.8.23.2.c.5 and the surveillance test procedures for Auxiliary Building (AB) Battery SeMce Discharge Tests. Specifically,4.8.2.32.c.5 lists a single numerical nummum ICV of 1.75 volts as the acceptance criterion. He surveillance test procedures list ICVs of 1.75 volts as the Technical Specifications Acceptance Criterion and minimun battery terminal voltage of 110 or 111 volts (depending on the specific b.

battery) as the Engineermg Acceptance Criterion. The latter criterion, which includes conservative design margins, is required by ergineering design calculation to ensure operability of design load equipmem. If all battery ICVs at the end of a test werr,1.75 volts. the battery terminal voltage would be 105 volts. Such a voltage would be less than the minimum 110 or 11i volts specified tc ensure operability ofload equipment.

Derefore, the use of only tha Technical Spcifications Acceptance Criterion could lead to the conclusion that such a battery would be operable when it might not have the capacity to supply adequate voltage to design loads during accidem conditions. The proposed Technical Specifications change and supporting FSAR revision will resolve this issue. The revision of Technical Specification 4.8.2.5.2.c.5 and supporting FSAR revision is proposed in order to maintain consistency of surveillance requirements between the AB and Service Water Building (SWB) batteries.

Auxiliary Buildine Batterv Analysis The Unit I and 2 AB 125VDC Systems are designed to provide power to safety-related equipment during all modes of plant operation. The systems include battery chargers, batteries, switchboards and distribution cabling and panels. He system load includes vital bus inverters, DC operated controls and instruments, along with emergency lighting. The capacity requirement of the batteries during the design basis accident, Loss of Offsite Power (LOSP) or LOSP combined with Loss of Coolant Accident (LOCA),

is to supply the loads necessary to mitigate the accident from the onset of LOSP until battery chargers are energized from the emergency diesel generators. While not a requirement for mitigation of design basis ATT III-1 i

accidents,.the batteries have the capability of providing required voltage to equipment for extended periods of time during events such as LOSP or LOSP with LOCA assuming battery charger failure. He design load profile for this scenario is that each battery supplies 500 a. os for the first minute followed by 350 amps for the following i19 minutes while maintaining adequate witage to emergency loads during the specified intervals.

A Farley specific engineering calculation establishes the mmimum battery terminal voltage to assure operation of the loads. To provide margin and allow for additional future load, the calculation specifies the following minimum acceptable 120 minute temunal voltages for testing purposes. Rese values are above the calculated minimum voltages to ensure equipmer.t operation: Unit 1 AB Batteries I A and IB = 111 volts; and Uni' 2 AB Batteries 2A and 2B = 110 volts.

%c current technical specification surveillance specifies mmimum ICVs of 1.75 volts but does not specify minimum battery terminal voltage. He current version of the FSAR specifies the battery current load profile for 120 minutes and does not address mimmum battery terminal voltage or ICVs. Plant procedures currently reflect minimum ICVs of 1.75 volts as Techaical Specification Acceptance Criterion and minimum battery terininal voltages as Engineering Acceptance Cnterion. These inconsistencies could potentially lead to placing a battery back in service based on the Technical Specification Acceptance Criterion ofICVs > 1.75 volts wh n the Engineering Acceptance Criterion for minimum battery terminal voltage had not been met.

Service Water Building Battery Analysis he FNP SWB 125VDC Distribution System includes batteries, battery chargers, cabling and instrumentation to provide electrical power for safety and non safety-related loads supplied by SWB DC distnbution panels during all medes of plant operation. He batteries are sized to supply the loads for two hours without battery charger support. He design load profile for the batteries is to supply 30 amps for 1 minute followed by 3 amps for the following i19 minutes.

Presently, FNP Units I and 2 Technical Specifications 4.8.2.5.2.c.5 require senice tests on the batteries at 18 month intervals. For these surveillances, the Technical Specifications specify that post test ICVs remain greater than er equal to 1.75 volts. His value is the only test procedure acceptance criterion. If all post test ICVs are 1.75 volts, battery terminal voltage will be 105 volts. Based on FNP specific engineering calculation, this exceeds the minimum supply voltage required by the connected equipment. Herefore, a SWB battery termmal voltage of 105 volts is adequate to assure operability of connected loads.

Since the present acceptance criteria is based only on ICVs, it is possible that one or more post test ICVs could drop to less than 1.75 solts (indicating potentially degraded cells) while battery termmal voltage remains greater than 105 volts. Such an instance would r quire declaring the battery inoprable when it remamed capable of performing its design function. It is therefore desired to add ba:tery temimal voltage as an additional acceptance criterion for these surveillances. This change will permit evaluation of battery eperability based on ability to provide adequate voltage to the loads while corrective action for potentially degraded cells is ; arsued. The proposed change also assures consistency between the AB and SWB battery senice test acceptance criteria.

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j Analysis Sununary The proposed changes to the AB and SWB battery surveillances modifies the Technical Specifications by removing the single battery IC V acceptance criterion and replacing it with a reference to the battery load profile specified in the FSAR. The proposed change also brings the battery testing technical specification in line with the suncillance requirements of the Westinghouse Standard Technical Specifications (NUREG 1431 Revision 1). The load profile information in the FSAR will be supplemented witn the muumum battery termmal voltage for testing purposes based on engineering design information. He FSAR will also require that ICVs remain greater than 1.75 volts to ensure a battery will not be returned to senice with a cell (or cells) in a degraded condition without an engineering evaluation. De surveillance procedures revisions will clearly require that both battery termmal voltage and all ICVs remain greater than the minimum limits %e battery surveillance change, FSAR revision and procedure enhancements climinate the potential for placing a battery back in senice with termmal voltages below the minimum required for equipment operability while ICVs remam greater than 1.75 volts. %e battery surveillance changes along with the FSAR and procedure revisions will maintain consistency between the different battery surveillance testing.

50.92 Evaluation Based on the analysis presented above, the following are conclusions reached with respect to 10 CFR 50.92.

1)

He proposed changes to remove and replace specifi: acceptance criterion in the Technical Specifications with a reference to more detatied and bounding criteria in the FSAR for senice tests on the batteries do not involve a significant increase in the prob.ibility or consequences of an accident previously evaluated in the Farley FSAR. He AB and SWB bc. ries do not initiate any accident. Clarification of testing acceptance criteria does not advene!y affect t.c batteries ability to mitigate the consequences of any accident in the Farley FSAR. No new accident inietors are identified as a result of this proposed revision.

A Fo new performance requirements for any systern that is used to mitigate dose censequences have been imposed by this proposed change. No input assumptions to any dose consequence calculations are affected by this proposed change. All previously reported dose consequences remam bounding. Therefore, the radiological consequences resulting from any accident pn:viously evaluated in the FS AR are not increased.

2)

The proposed changes to remove and replace specific acceptance criterion in the Technical Specifications with a reference to more detailed and bounding criteria in the FSAR for senice tests on the batteries do not create the possibility of a new or different kind of accident from any previously evaluated in the Farley FSAR. No new accident scenarios, failure mechanisms or limiting single failures are introduced as a result of the larifications to the battery senice test acceptance criteria. No new challenges to the safety-related AB or SWB 125VDC Distribution Systems have twen identified. He 125VDC Systems including the batteries have not been modified. Farley will continue to perfcrm senice discharge surveillance tests in accordance with the frequency requirements of the Technical Specifications to demonstrate battery operability. Previously identified accHent scenarios remain bounding because the performance requirements of the batteries have not been changed. Therefore, time possibility of a new or different kind of accident is not created.

3)

He proposed changes to remove and replace specific acceptance criterion in the Technical Spccifications with a reference to more detailed and bounding criteria in the FSAR for service tests on the batteries do not involve a significant reduction in the margin of safety. All previously established acceptance limits contir.ue to be met for all events since the battery function is to provide power during the time between LOSP & D/G shrt and in the event of battery charger failure to mitigate the consequences of A'IT 111 - 3

any accident scenario.' Relocating and clarifying service test acceptance criteria will not invalidate the battery function here are no physical modifications reqaired to the AB er SWB 125VDC Distribution ~

- Systems or the battesies, his change will not affect the operation of the batteries or any other safety-related equipment. Applicable values, reflected in the governing electrical design calculations, will be incorporated into the FSAR and will remain or be included in the sarveillance test procedures. Since current battery performance acceptance limits will continue to h: met, there is no reduction in the margia of safety,_

Conclusion Based upon the preceding evaluation, it has been deterrained that the proposed changes to th: FNP Technical Specifications removing specific battery ICV acceptance criterion and replacing the criterion with a reference to more detailed criteria in the FSAR do not involve a significant hazards consideration as -

defined in 10 CFR 50.92 (c).

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