ML20083C096
| ML20083C096 | |
| Person / Time | |
|---|---|
| Site: | Arkansas Nuclear  |
| Issue date: | 12/15/1983 |
| From: | ARKANSAS POWER & LIGHT CO. |
| To: | |
| Shared Package | |
| ML20083C092 | List: |
| References | |
| NUDOCS 8312220111 | |
| Download: ML20083C096 (7) | |
Text
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ELECTRICAL POWER SYSTEMS D.C. DISTRIBUTION - OPERATING LIMITING CONDITION FOR OPERATION 3.8.2.3 As a minimum, the following D.C. electrical sources shall be OPERABLE:
TRAIN "A" corsisting of 125-volt D.C. bus No.1,125-volt D.C.
battery bank No. 1 and a full capacity charger.
TRAIN "B" consisting of 125-volt D.C. bus No. 2, 125-volt D.C.
battery bank No. 2 and a full capacity charger.
APPLICABILITY:
MODES 1, 2, 3, and 4.
ACTION:
a.
With one of the required battery banks inoperable, restore the inoperable battery bank 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 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 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 one of the required full capacity chargers inoperable, demonstrate the OPERABILITY of its associated battery bank by performing Surveillance Requirement 4.8.2.3.1.a.1 within one hour, and at least-once per 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> thereafter until an operable charger is restored to the affected bank.
If any Category A limit in Table 4.8-2 is not met, declare the battery inoperable.
SURVEILLANCE REQUIREMENTS 4.8.2.3.1 Each 125-volt battery bank and charger shall be demonstrated OPERABLE:
a.
At least once per 7 days by verifying that:
1.
The parameters in Table 4.8-2 meet the Categ'ory A LIMITS, and 2.
The total battery terminal voltage is greater than or equal to 129 volts on float charge.
8312220111 831215 DR ADOCK 05000360 p
PDR I
ARKANSAS -' UNIT 2 3/4 8-8 AMENDMENT NO.
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ELECTRICAL POWER SYSTEMS SURVEILLANCE REQUIREMENTS (Continued) b.
At least once per 92 days and within 7 days af ter a battery discharge with battery terminal voltage below 110 volts, or battery overcharge with battery terminal voltage above 150 volts, by verifying that:
1.
The parameters in Table 4.8-2 meet the Category B LIMITS, 2.
The average electrolyte temperature of 12 of the connected cells is above 60 F.
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 150x10-6 ohm, and 4.
The battery charger will supply at least 200 amperes at 2125 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 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 the battery service test.
f.
At least once per 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 expected for the application.
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.
ARKANSAS - UNIT 2 3/4 8-9 AMENDMENT NO.
TABLE 4.8-2 BATTERY SURVEILLANCE REQUIREMENTS l-l CATEGORY A(1) l CATEGORY B(2) l 2 -
l-1 I
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l Parameter l LIMITS for each l LIMITS for each l ALLOWABLE 3) l I
l l designated pilot l connected cell l VALUE for each l
4 l
l cell l
l connected cell l
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_l l
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1 1
I Electrolyte l > Minimum level l > Minimum level l Above top of I
l l indication mark, l indication mark, l plates.
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l and $\\" above l and $h" above l and not l
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.l maximum level-l maximum level l overflowing l
l l indication mark
- l indication mark l
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l l Float Voltage l 22.13 volts l 22.13 volts (c) l >2.07 volts l
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I l
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l Specifi l
l l Not more.than l
lGravity{,)
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l.020 below the
- l l
l l average of all l
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l 21.190 l connected cells l
l 21.195(D) lAverageofall Average of all l
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'l I connected cells l connec g cells l
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l >1.200 l 21.190 l
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1 (a) Corrected for electrolyte temperature and level.
(b) Or battery charging. current is less than 2 amps when on charge.
(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 Category A and B parameter (s) are restored to within LIMITS within the next 6 days.
(2) For any Category B parameter (s) outside the LIMIT (S) shown, the battery may be considered OPERABLE provided that the Category B parameters are restored to within LIMITS within 7 days.
(3) Any Category B parameter not within its ALLOWABLE VALUE indicates an inoperable battery.
. ARKANSAS - UNIT 2 3/4 8-9a AMENDMENT NO.
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PROPOSED REVISION OF ANO-2 TECHNICAL SPECIFICATION 3.8.2.3 BASES FOR CHANGE AND EVALUATION OF EFFECT ON PLANT OPERATION The proposed changes to AN0-2 Technical Specification 3.8.2.3 and corresponding Surveillance Requirements are requested to reflect current industry standards and practices, AN0-2 specific design parameters, and limits previously approved by the NRC.
The development of these proposed changes was based on NUREG-0452, Revision 4 and IEEE Standard 450-1980.
The proposed changes will not affect the safety of plant operation nor alter the ability of the batteries to perform as described in the FSAR.
NUREG-0452, Revision 4, " Standard Technical Specifications for Westinghouse Pressurized Water Reactors," contains the current NRC-approved Standard Technical Specifications for battery systems used in Westinghouse nuclear power plants.
The battery system used at ANO-2 is essentially equivalent in general design and application to the systems employed in Westinghouse plants.
Therefore, the proposed changes conform to this approved revision as adapted to AN0-2 specific conditions with reference to IEEE Standard 450-1980.
The following are bases for proposed changes to the Standard Technical Specifications to incorporate ANO-2 specific conditions.
3.8.2.3 AN0-2 has an additional full capacity charger which can be used in the event that an operable charger becomes inoperable.
For this reason, the phrase "its associated full capacity charger" in the Standard Technical Specification was changed to "a full capacity charger" in the proposed Specification for Trains "A" and "B".
Action b.
The phrase "until an operable charger is restored to the affected bank" was added for clarity.
4.8.2.3.1.b.2 A precise and accurate method for measuring cell-to-cell and terminal connection resistance with the cells in service and on float charge has not been identified.
The AN0-2 battery and bus design does not include disconnects or isolation devices which allow testing while the batteries are in service.
Therefore, meaningful resistance testing must be performed while the battery and bus are not in service during refueling outages.
Performing resistance testing each 92 days would require plant shutdown at AN0-2, and for this reason we propose to delete this requirement from the 92-day surveillance tests of terminal resistances.
Performing resistance tests at least once per 18 months during our operating experience with these batteries has demonstrated their capability to perform their safety functions.
4.8.2.3.1.c.3 Cell-to-cell and terminal connection resistance is interpreted to not include connecting cabling resistance between multip.e racks and/or tiers of cells.
4.8.2.3.1.c.4 The proposed change from the Standard Technical Specification limit of at least 400 amperes to at least 200 amperes is necessary due to ANO-2 battery charger design.
The current specification requires the battery charger to supply at least 200 amperes according to design.
4.8.2.3.1.d.e,f Tests described in these surveillance items are as defined in IEEE Standard 450-1980, Section 2.
4.8.2.3.1.f The proposed change from the Standard Technical Specification testing frequency of " Annual" to "At least once per 18 months, during shutdown" is necessary to prevent plant shutdown.
TABLE 4.8-2 BATTERY SURVEILLANCE REQUIREMENTS The Standard Technical Specifications assume a manufacturer's recommended full charge specific gravity of 1.215.
Assuming such full charge specific gravity, the Standard Specification test criteria are 21.200 for Category A testing and 21.195 for Category B testing.
The manufacturer's recommended full charge specific gravity for ANO-2 batteries is 1.210, and the resultant proposed criteria are 21.195 for Category A testing and 21.190 (>1.200 for average of all connected cells) for Category B testing.
i SIGNIFICANT HAZARDS CONSIDERATION DETERMINATION The proposed amendment request does not involve a SHC because (A) operation of Arkansas Nuclear One in accordance with this change would not:
1) involve a significant increase in the probability or consequences of an accident previously evaluated; or 2) introduce the possibility of a previously unanalyzed accident; or 3) involve a significant reduction in a margin of safety; and (B) the proposed amendment matches the example (s) checked below:
(ref:
DLOP 288, Federal Register, Vol. 48, p. 14870).
Examples of amendments which do not involve SHC:
a (i) purely administrative change to technical specifications:
for example, a change to achieve consistency throughout the technical specifications, correction of an error, or a change in nomenclature.
a (ii)
A change that constitutes an additional limitation, restriction or control not presently included in the technical specifications:
for example, a more stringent surveillance requirement, a
(iii) For a nuclear power reactor, a change resulting from a nuclear reactor core reloading, if no fuel assemblies significantly different from those found previously acceptable to the NRC for a previous core at the facility in question are involved.
This assumes that no significant changes are made to the acceptance criteria for the technical specifications, that the analytical methods used to demonstrate conformance with the technical specifications and regulaticns are not significantly changed, and that NRC has previously found such methods acceptable, a
(iv)
A relief granted upon demonstration of acceptable operation from an operating restriction that was imposed because acceptable operation was not yet demonstrated.
This assumes that the operating restriction and the criteria to be applied to a request for relief have been established in a prior review and that it is justified in a satisfactory way that the criteria have been met.
a (v)
Upon satisfactory completion of construction in connection with an operating facility, a relief granted from an operating restriction that was not yet completed satisfactorily.
This is intended to involve only restrictions where it is justified that construction has been completed satisfactorily.
a (vi)
A change which either may result in some increase to the probability or consequences of a previously-analyzed accident or may reduce in some way a safety margin, but where the results of the change are clearly within all acceptable criteria with respect to the system or component specified in the Standard Review Plan:
for example, a change resulting from the application of a small refinement of a previously used calculation model or design method.
a (vii) A change to a license to reflect a minor adjustment in ownership shares among co-owners already shown in the license.
BASIS: We have determined that this change is related to relief granted upon demonstration of acceptable operation from an operating restriction imposed because acceptable operation had not yet been demonstrated. We believe that strict surveillance requirements were originally imposed to provide additional operating and surveil';ance data.
This data has been accumulated and analyzed resulting in new industry standards and practices which provide relief in surveillance requirements.
IEEE Standard 450-1980 describes the latest industry criteria and provides the bases for NUREG-0452, Revision 4 previously approved by the NRC.
1 The proposed changes do not significantly alter the methods used to demonstrate conformance with battery operability requirements nor do these changes affect the safety of plant operation or alter the ability of the 125-volt batteries to perform as described in the FSAR.
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