ML20029B434

Proposed Tech Specs 3/4.8.2.3 Re Electrical Power Sys

ML20029B434
Person / Time
Site:	Davis Besse
Issue date:	03/01/1991
From:	CENTERIOR ENERGY
To:
Shared Package
ML20029B433	List: ML20029B432 ML20029B434
References
NUDOCS 9103070289
Download: ML20029B434 (6)

Text

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Docket Number 50-346 Liecnso Nu:bar NPF-3 S:rici Nu bsr 1898 7

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(g ELECTRICAL POWER SYSTDiS j(,'

D.C. DISTRIBUTION - OPERATING L1HITING CONDITION FOR OPERATION 3.8.2.3 The following D.C. bus trains shall be energized and OPERABLE with disconnect switches between bus trains open:

TRAIN "A" consisting of 250/125-volt D.C. MCC 1, 125 volt D.C.

station batteries IP and IN and 2 full capacity chargers.

TRAIN "B" consisting of 250/125 volt D.C. MCC 2,125-volt D.C.

station batteries 2P and 2N and 2 full capacity chargers.

APPLICABILITY: MODES 1, 2, 3 and 4.

ACTION:

With only one 125-volt D.C. bus of a 250/125 volt D.C. MCC a.

OPERABLE, restore the inoperable bus to OPERABLE status within 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br /> or be in at least HOT STANDBY vithin the next 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> and in COLD SHUTDOWN within the following 30 hours3.472222e-4 days <br />0.00833 hours <br />4.960317e-5 weeks <br />1.1415e-5 months <br />.

b.

With only one 125-volt D.C. battery or only one charger of one MCC OPEAABLE, restore the inoperable battery or charger to OPERABLE status within 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br /> or be in at least NOT STANDBY within the next 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> and in COLD SifUfDOWN within the following 30 hours3.472222e-4 days <br />0.00833 hours <br />4.960317e-5 weeks <br />1.1415e-5 months <br />.

SURVEILLANCE REQUIREMENTS 4.8.2.3.1 Each D.C. bus train shall be determined OPERABLE and energized with disconnect switches open between redundant busses at least once per 7 days by verifytag correct disconnect switch / breaker alignment, indicated power availability f rom the charger and battery, and voltage on the bus of greater than or equal to 125 volta D.C.

4.8.2.3.2 Each 125 volt battery and charger shall be demonstrated OPERABLE:

a.

At least once per 7 days by:

1.

. Verifying that the parameters in Table 4.81 seet the Category A limits, and 9103070289 910301 PDR ADOCK 05000346 P

PDR ll DAVIS-RESSE,llNIT1 3/4 8-8

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Attachment FORINFORMDN ON.Y ELECTRICAL POWER SYSTEMS SURVE!LIANCE REQUIREMEMS (Continued) 2.

Verifying total battery terminal voltage is greater than or equal to 129 valts on float charge.

b.

At least once per 92 days and within 7 days af ter a battery discharge (battery terminal voltage below 110 volts). or battery overcharge (battery teminal voltage above 150 volts), by:

1.

Verifying that the parameters in Table 4.8-1 meet the Category B limits, 2.

Verifying that there is no visible corrosion at either terminals or connectors, or the connection resistance of these items is less than 150 x 10'8 obas, and 3.

Verifying that the average electrolyte temperature of every sixth connected cell is above 60'T.

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 150 x 10-' obas, and 4

The battery charger will. supply at least 475 amperes at a minimum of 130 volts for at least 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br />.

d.

At least once per 18 months, during shutdown, by verifying that the battery capacity is adequate to supply and maintain in OPERABLE status all of the actual or simulated emergency loads for the design duty cycle when the battery is subjected to a battery service test, e.

At least once per 60 months, during shutdown, by verifying t. hat the battery capacity is at least 80% of the manufacturer's rating when subjected to a performance discharga test. Once per 60 month interval this performance discharge test may be performed in lieu of the battery service test.

f, Every 18 months, during shutdown, performance discharge tests of battery capacity shall be given to any battery that shows signs of degradation or has reached 85% of the service life espected for the application. Degradation is indicated when the battery capacity drops more than 10% of rated capacity f rom its average on preytou:

performance tests, or is below 90% of the manuf acturer's rattog.

l DAVIS-RESSE, UNIT 1 3/4 8-9 Amendment No.100

Dockat Nu ber 50-346 Lietnsa Nu bar NPF-3 Serial Number 1898 Attachment TABLE 4.8 1 Page 8 BATTERY SURVEILIANCE REQUIREMENTS v

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CATEGORY A CATEGORY BII) parameter limits $r earb Limits for each Allowable ( )

designated ptiot connected cell value for each cell connected cell Electrolyte

> Minimum level

>Mintsum level Above top of Level indication mark, indication mark,

plates, and i \\" above and $ k above and not maximue level maximua level overflowing indication mark indication mark Float Voltage

> 2.13 volts

> 2.13 volt:(b)

> 2.07 volts Not more than

,020 below the average of all

> 1.195-connected cells Specifi

>1.200p l

Gravity {,)

Average of all Average of all connected cells connected cells

,, 1.19$ M l

> 1.205 (a)

Corrected for electrolyte temperature and level.

. g(b)

Corrected for average electrolyte toeparature.

(1)- For any Category A parameter (s) outside the limit (s) shown, 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 /> all the Category B measurements are taken and found to be within their allowable values, and provided all p7tameter(s) are restored to within limits within the nest 4

6 days.

(2) For any Category 8 parameter (s) outside the limit (s) shown, the battery may be considered OPERABLE provided that they are within their allowable values and provided the parameter (s) are restored to within limits within 7 days.

t (3) Any Catesory 8 parameter set within its allowable value indicates an

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inoperable battery.

{0 Oc boMty chan m cure 4, Ritetamg ti arvge o r %rmtw.c discharge tb, y jessThan SWe mys, when o,3 g fIecd chnep.

DAVIS-lESSE UNTT 1 3/4 8-10 h at No.100

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E C ICAL POVER SYSTEMS D.C. DISTRIBUTION - SHVTDOVW LIMITINO CONDITION FOR OPERAT!0N 3.8.2.4 As a minious, the following D.C. electrical equipment and bus shall be energized and OPERABLE:

1 - 250/125 volt D.C. NCC, and 2

125 volt battery banks and chargers supplying the above D.C. MCC.

APPLICAt!LITY: MODES 5 and 6.

ACTION:

With less than the above complement of D.C. equipment and bus OPERABLE, establish CONTAINMENT INTEGRITY within 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br />.

SURVE!LLANCE kEQUIREMENTS 4.8.2.4.1 The above required 250/125-volt D.C. MCC shall be detensined OPERABLE and energized at least once per 7 days by verifying correct disconnect switch / breaker alignment, indicated power availability from the charger and battery, and voltage on the bus of greater than or equal to 125 volts D.C.

4.8.2.4.2 The above required 125 volt battery banks and chargers shall be demonstrated OPERABLE per Surveillance Requirement 4.8.2.3.2.

DAVIS-RESSE, UNIT 1 3/4 4-11 Amendment No.100 j

Docket Nu:ber 50-346 Lic:nse Nu b:r NPF-3 Serial Number 1898 Attachment Page 10 3/4.8 ELECTRICAL p0VER SYSTEMS BASES The OPERABILITY of the A.C. and D.C. power sources and associated distribu-tien systems during operation ensures that sufficient power will be available to supply the safety related equipment required for 1) the safe shutdown of the f acility ud 2) the mitigation and control of accident conditions within the facility. The minimum specified independent and redundant A.C. and D.C. power sources and distribution systans satisfy the requirements of General Design Criterion 17 of Appendix "A" to 10 C11t $0.

The ACTION requirements specified for the levels of degradation of the power sources provide restriction upon continued facility operation commensurate with the level of degradat. ion. The OPERABILITY of the power sources are consistent with the initial condition assumptions of the safety analyses and are based upon maintaining at least one of each of the onsite A.C. and D.C. power sources and associated distribution systems OPEpABLE during accident conditions coincident with an assumed loss of offsite power and single fa11ute of the other onsite A.C. source.

The OPERABILITY of the minimum specified A.C. and D.C. power sources and associated distribution systems during shutdown and refueling ensures that

1) the f acility can be maintained in the shutdown or refueling condition for extended time periods and 2) sufficient instrumentation and control capability is available for monitoring and maintaining the facility status, r

The Surveillance Requirements for demonstrating the OPERABILITY of the station batteries are based on the recommendations of Regulatory Cuide 1.129, " Maintenance Testing and Replacement of Large Lead Storage Batteries for Nuclear Power Plants". February 1978, and IEEE Std: 450-1980 "IEEE Recommended Practice for Maintenance. Testing, and Replacement of Large Lead Storage Batteries for Generating Stations and Substations".

Verifying average electrolyte temperature above the minimum for which the battery was sised, total battery terminal voltage on float charge, connec-tion resistance values and the performance of battery service and discharge tests ensures the effectiveness of the charging system, the ability to handle high discharge rates and compares the battery capacity at that time with the rated capacity.

Table 4.8-1 specifies the normal limits for each designated pilot cell and each connected cell for' electrolyte level, float voltage and specific-gravity..The limits for the designated pilot cells float voltage and specific gravity,- greater than 2.13 volts and.015 below the manuf seturer's

~

full charge specific gravity +is characteristic of a charged cell trith twtt I

adequate capacity. The normal limits for each connected cell for float

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M voltage and specific gravity, greater than 2.13 volts and not more than

.020 below the manufacturer's full charge specific gravity with an average d (e.u specific gravity of all the connected ceD s not more than.010 below the Ov1 manufacturer's full charge specific gravity, ensures the OPERABILITY and

%D capability of the battery.

a%SI DAVIS-BESSE. IMIT 1 B 3/4 8-1 Amendment No.100

Docket Nu=$~- '^

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Serial Numoer 1896 Attachment l' age 11 Insert to TS Dases 3/4._8 Exceptions to the specific gravity requirements are taken to allov for the normal deviations experienced atter a battery discharge and subsequent recharge associated with a service or performance discharge test. The specific gravity deviations are recognized and discussed in IEEE 450-1980.

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