ML20198A195

Corrected TS Bases Pages B 3/4 8-15,-16 & -17,as Discussed During 981103 Telcon

ML20198A195
Person / Time
Site:	South Texas
Issue date:	12/09/1998
From:	HOUSTON LIGHTING & POWER CO.
To:
Shared Package
ML20198A194	List: ML20198A195 NOC-AE-000378, Forwards Corrected TS Bases Pages B 3/4 8-15,-16 & -17, Discussed During 981103 Telcon
References
NUDOCS 9812160177
Download: ML20198A195 (3)

Text

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, ELECTRICAL POWER SYSTEMS BASES A.C. SOURChiS. D.C. SOURCES. and ONSITE POWER DISTRIBUTION (Contin  ;

The Surveillance Requirements for demonstrating the OPERABILITY of the station batteries are based on the recommendations of Regulatory Guide 1.129, " Maintenance Testing and Rep'acement of Large 12ad 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."  !

The voltage requirements are based on the nominal design voltage of the battery and are l

consistent with the initial voltages assumed in the battery sizing calculations. The seven-day Frequency is conservative with respect to manufacturer recommendations and IEEE-450 (Ref. 9), i SR 4.8.2. La This action is performed on a nominal seven-day cycle and documents inspection of the battery and battery room condition to the following attributes:

• Charger output current and voltage, l

e Pilot cell voltage, specific gravity and temperature (values-recorded) i Table 4.8-2 specifies the normallimits 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 0.015 below the manufacturer's full  !

charge specific gravity or a battery charger current that had stabilized at a low value, are characteristic of a charged cell with adequate capacity. The seven-day frequency is conservative with respect to manufacturer, IEEE Std 450-1980 and regulatory guide recommendations.

SR 4.8.2.1.b This action is performed on a nominal 92-day cycle and documents measurement of the battery parameters to include the following attributes:

e Voltage and specific gravity of each cell e Electrolyte temperature of selected representative cells e Connections are visually inspected and resistance measurement is performed only on a connection that appears to 1,e loose or corroded -

Table 4.8-2 specifies the normallimits for each designated pilot cell and each connected cell for electrolyte level, float voltage, and specific gravity. The normallimits for each connected cell for float voltage and specific gravity, greater than 2.13 volts and not more than 0.020 below the manufacturer's fall charge specific gravity with an average specific gravity of all the connected cells not more than 0.010 below the manufacturer's full charge specific gravity, ensures the O.PERABILITY and capability of the battery. The 92-day frequency is consistent with manufacturer and regulatory guide recommendations.

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9812160177 981209 PDR ADOCK 05000498 ,

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BASES l

A.C. SOURCES. D.C. SOURCES. and ONSITE POWER DISTRIBUTION (Continued) ]

Operation with a battery cell's parameter outside the normallimit but within the allowable value specified in Table 4.8-2 is permitted for up to seven days. During this seven-day period: (1) 1 the allowable values for electrolyte level ensures no physical damage to the plates with an  !

adequate electron transfer capability; (2) the allowable value for the average specific gravity of all the cells, not more than 0.020 below the manufacturer's recom. mended full charge specific gravity, ensures that the decrease in rating will be less than the safety margin provided in sizing; (3) the allowable value for an individual cell's specific gravity, ensures that an individual cell's specilic gravity will not be more than 0.040 below the manufacturer's full charge specific gravity and that (

the overall capability of ti.e battery will be maintained within an acceptable limit; and (4) the i allowable value for an individual cell's float voltage, greater than 2.07 volts, ensures the battery's capability to perform its design function. ~

SR 4.8.2.1.c.l. 2 & 3 This action is performed on an 13 rnonth (maximum) cycle and documents inspection of the battery to include the following attributes: l e Detailed visualinspection of each cell, including plate condition

• Detailed visual inspection of battery rack Bolted connections cleaned, coated with anti-corrosion material and retorqued e Resistance of bolted connections measured and recorded Visual inspection and resistance measurements of inter-cell, inter-rack, inter-tier, and terminal connections provide an indication of physical damage or abnormal deterioration that could indicate degraded battery condition. The anticorrosion materialis used to help ensure good electrical connections and to reduce terminal deterioration. The visualinspection for corrosion is i not intended to require removal of and inspection under each terminal connection. The removal of visible corrosion is a preventive maintenance SR. The presence of visible corrosion does not necessarily represent a failure of this SR provided visible corrosion is ren'oved during performance of SR. The surveillance frequency of 18 months exceeds the IEEE-450 recommendation of 12 months, and is consistent with extension of the refuel cycle to 18 months.

SR 4.8.2.1.c.4 This action is performed on an 18-month (maximum) cycle and documents the capability of the battery charger to supply rated current at 125 V for a period of eight hours. The battery charger supply is required to be ' sed on the largest combined demands of the various steady state loads and the charging cam 4. eestore the battery from the design minimum charge state to the fully charged state, irrespectivc J the status of the unit during these demand occurrences.

The minimum required amperes and duration ensures that these requirements can be satisfied.

The surveillance frequency is acceptable, and is intended to be consistent with the expected fuel cycle lengths.

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SOUTH TEXAS - UNITS 1 & 2 B 3/4 8-16 Unit 1 - Amendment No. 5393-98 Unit 2 - Amendment No. 5393-98 OAWPMANRC-WK'TSCRAMENDMEN\98\Bawe_ComcOr. dos

• / ' ELECTRICAL POWER SYSTEMS L

BASES A.C. 50URdES. D.C. SOURCES. and ONSITE POWER DISTRIBUTION (Conti SR 4.8.2.1.d A battery service test is a special test of battery capability, as found, to satis'fy 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. The surveillance frequency of 18 months is consistent with the recommendations of Regulatory Guide 1.129, which state that the .

battery service test should be perfonned during refueling operations, or at some other outage,

- with intervals between tests not to exceed 18 months.

SR._4.8.2.1.e 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 determined by the acceptance test. This test is intended to determine overall battery degradation due to age and usage. A performance discharge test is allowed in lieu of a service test once per 60 months.

SR 4.8.2.1.f The performance discharge test surveillance frequency for this test is normally 60 months.

If the battery has reached 85% ofits expected life, or if the battery capacity has decreased by 10 percent or more of the manufacturer's rating, the surveillance frequency is reduced to 18 months because the test must be perfonned during the refueling operations. The 18 month interval exceeds the IEEE-450 recommendation.

3/4.8.4 (Not Used) l l SOUTli TEXAS - UNITS 1 & 2 B 3/4 8-17 Unit 1 - Amendment No. 99M8 Unit 2 - Amendment No. 5393 98 17452-98 OAWhNDNRC-WK\T3CB\AMENDMEN\9mBases_ Comet kdos