ML20009F168
| ML20009F168 | |
| Person / Time | |
|---|---|
| Site: | Davis Besse  |
| Issue date: | 07/16/1981 |
| From: | NRC |
| To: | |
| Shared Package | |
| ML20009F167 | List: |
| References | |
| NUDOCS 8107300020 | |
| Download: ML20009F168 (5) | |
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ELECTRICAL' POWER SYSTEMS
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0.C. DISTRIBUTION - OPERATING LIMITING CONDITION FOR OPERATION
.3.8.2.3 The following D.C. bus trains shall be OPERASLE and energized:
TRAIN "A" consisting of (250/125)-volt 0.C. bus No. 1. (250/125)-volt lead battery bank No. 1, and a full capacity charger.
TRAIN "9" consisting of (250/125)-volt 0.C. bus No. 2, (250/125)-volt
-lead battery bank No. 2, and a full capacity charger.
APPLICABILITY:
MODES 1, 2, 3, and 4.
ACTION:
With one (250/125) volt 0.C. bus train inoperable or not energized, restore the inoperable bus train to OPERABLE and energi:ed 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 STANO3Y 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 SHUT 00WN within the follo.ing 30 hours3.472222e-4 days <br />0.00833 hours <br />4.960317e-5 weeks <br />1.1415e-5 months <br />.
This' specification is intended for use on plants with two divisions of 0.C.
po-er only.
Modifications may be necessary, on a plant-unique basis, to accommodate different designs.
SURVEILLANCE REOUIREMENTS 4.8.2.3.1 Each D.C. bus train shall be-determined OPERABLE and energi:ed with tie breakers cpen between redundant busses at least once per 7 days by verifying correct breaker alignment, indicated poaer availability from the~ charger and battery, and voltage.on the bus of greater than or equal to (250/125) volts.
4.3.2.3.2 Each (257/125)-volt battery bank and charger shall be demonstrated CPERAELE:
a.
At least'once per 7 days by:
1.
Veri'fying that the parameters in Table 4.3-2 meet the Category A limits, and 2.
Verifying total battery terminal voltage is greater than or equal to (253/123)-volts on float charge.
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8107300020 '81071'6 PDR ADOCK 05000346 P
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ELECTRICAL POWER SYSTEMS SURVEILLA'!CE REQUIR[l1CNT5 (Continued) b.
.At least once.per.92 days and within 7 days af ter a battery discharge
- (battery-terminal voltage below (220/110)-volts),.or battery ' overcharge (battery terminal voltage above (200/150)-volts), by:
1.
' Verifying that the parameters in Table 4.8-2 meet the Category B
- limits, 2.
Verifying there is no visible corrosion at either terminals or connectors, or the connection resistance of these items is less than (150 x 10 5) ohms, and' 3.
Verifying that the average electrolyte tem;arature of (a representative number) of connected cells is above (60 F).
c.
At least once per IS 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 connecti ts 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 5) ohms, and j
4.
The battery charger will supply at least (400) amperes at t
(125/250) volts for at least (B) nours.
i d.
At least once per 15 months, during shutdown, ty verifying that tne battery capacity is acequate to su: ply and maintain in OPERABLE status all of the actual or simulated emergency loads for the design cuty cycle when the battery is su.
cted to a battery service test At least once per fJ months, during shutdewn, by verifying that the e.
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 the battery j
service test.
f.
Annual phrformance discharge tests of battery capacity shall be given te any battery that shows signs of cegradation or has reached S5*4 of the service life expected for the application.
Degradation j
is indicated when the battery capacity dreps more than 10% of rated capacity from its average on previcus performance tests, or is below 90*; of the manufacturer's rating.
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. TABLE 4.8-2 BATTERYLSURVEILLANCE REQUIREt:ENTS SI)
CATEGJRY B(2)
CATEGORY A Parameter-Limits for each Limits for each
-pilowable(3)-
designated pilot connected cell value for each cell connected cell Electrolyte.
> Minimum level
> Minimum level Above top-of Level.
Indication mark, indication mark,
- plates, i
and < \\" above and < %" above and not maximum level maximum level overflowing indication mark indic.ation mark j
> 2.13 volts 1 2.13 volts (c)
> 2.07 volts Float Voltagt... '.. -
i Not more than
.020 below the S.
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average of all
> (1.195) -
connected cells-
,.ri ra r6-
- (1.200)(D)
Specific Gravity (a)
Avera e of all Average of all connected cells connected (glis-
> (1.205)
> (1.195)
(a) Corrected for electrolyte temperature and level.
(b) Or battery charging current is less than (2) amps.
(c) Corrected for average electrolyte temperature.
(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 p'arameter(s) are restored to within limits withint the next 6 days'.
(2) For any Category 3 parameter (s) outside the limit (s) shewn, the battery.
may be consicered OPERABLE provided that they are within their allcwable values and provided the parameter (s) are restored to within limits within 7 days.
(3) Any Category 3 parameter not within its alicaable value indicates an inoperable battery.
Numbers in paretheses assume a manufacturer's recon =enced full cnarge specific gravity of 1.215.
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3/4.8 ELECTRICAL PO'<!ER SYSTEMS BASES' 3/4.8.l'ANO 3/4.8.2~ A.C. 50dRCES-AND ONSITE PC'.-lER DISTRIBUTION SYSTEMS The OPERABILITY of the A.C.-and D.C power sources-and associated distribution systems during operation ensures that sufficient power will be available to supply'the safety related equipment required for 1) the safe shutdown.of the facility.and'2) the mitigation and control of accident condi -
tions.within'the. facility.
The minimum specified independent and redundant-A.C. and D.C. power sources and d'stribution systems satisfy the -requirements of General Design Criterion 17 of Appendix "A" to '10 CFR 50.
The ACTION requirements specified for the levels of degradation of the power sources provide restriction upon continued facility operation commensurate i-with the level of degradation.
The OPERABILITY of the power sources are consistent with the initial condition assumptions of the safety analyses and are based upon mai'ntaining at least one redundant set of onsite A.C. and 0.C.
i pc.er sources and associated distribution systems OPERABLE during accident conditions coincident with an assumed loss of offsite power and single failure of the other onsite A.C. source.
The OPERASILITY of the minimum specified A.C. and 0.C. power sources and associated distribution systems during shutdown and refueling ensures that 1) the facility can be maintained in the shutdown or refueling condition for extended time periods and 2).suf'icient instrumentation and control capability is available for monitoring and maintaining the unit status.
The Surveillance Requirement for demonstrating the OPERABILITY of the Station batteries are based on the recomrendations of Regulatory Guide 1.129,
" Maintenance Testing and Replacement of Large Lead Storage Batteries for Nuclear Power Plants," February 1973, and IEEE Std t50-1930, "IEEE Recomnended 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 sized, total battery terminal voltage enficat charge, connection resistance values and the performance of battery service and discharge tests ensures the effectiveness of the charging system, the ability to handle high discharge rotes and compares the battery capacity at'that time with the rated capacity.
Table 4.3-2 specifies the normal limits for each desipated pilot cell and each connected cell for electrolyte level, finat 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 acturer's full charge specific gravity or a battery charger current that had stabilized at a low value, is characteristic of a charged cell with adequate capacity.
The normab limits for each connected cell for float voltage and specific gravity, greater than 2.13 volts and not more than.020 below the manufacturer's full charge specific gravity s th an avers e specific gravity of all the connected cells not'more than.010 belos the manufacturst's full charge specific gravi y, t
ensures the OPERABILITY anc capability of the battery.
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ELECTRICAL POWER SY5TEMS BASES A.C. 50LRCES AND ONSITE l'0VER DISMIBuilCN SYSTEMS (Continued)
Operation with a battery cell's parameter outside the normal limit but within-the allowable value specified in Table 4.8-2 is permitted for up to 7 days.
During this 7' day period:
level ensures no physical damage to the plates with an adequate electron (1) the transfer ~ capability; (2) the allowable value for tt.e average specific gravity of all the cells, not pore than.020 below the manufacturer's reco= ended full charge specific gravity, ensures that the decrease in rating will be~1ess than the safety margin.provided in' sizing; (3) the allowable value for an indiv' dual wil.1 not be more than.040 below the manufacturer's full' char within an acceptable limit; and (4) the allowable value for an ind cell's float voltage, greater than 2.07 volts, ensures the cattery's capacility to perform its design function.
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