ML20235G397
| ML20235G397 | |
| Person / Time | |
|---|---|
| Site: | North Anna  |
| Issue date: | 09/22/1987 |
| From: | VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.) |
| To: | |
| Shared Package | |
| ML20235G393 | List: |
| References | |
| NUDOCS 8709300025 | |
| Download: ML20235G397 (18) | |
Text
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ATTACHMENT 1 I
i PROPOSED TECHNICAL SPECIFICATIONS CHANGES UNIT 1 Virginia Electric and Power Company 8709300025 870922 PDR ADOCK 05000338 P
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ELECTRICAL POWER SYSTEMS SURVEILLANCE REQUIREMENTS 4.8.1.1.3 Each diesel generator 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 4.8-3 meet Category A limits and 2.
The total battery terminal voltage is greater than or equal to 129 volts on a float charge.
b.
At least once per 92 days and within 7 days after a battery ' discharge i
l where the battery terminal voltage decreased below 110 volts or l
battery overcharge above 150 volts, by verifying'that:
1.
The parameters in Table 4.8-3 meet Category B limits and 2.
There is no visible corrosion at either terminals or connectors.
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 gell and terminal connection is less than or equal to 150 x 10 ohms.
4.
The battery charger will supply at least 10 amperes at 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 />.
d.
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.
c.
At least once per 18 months, during shutdown, perform a performance discharge test of battery capacity if the battery shows signs of degradation or has reached 85% of its service life expected for the application.
Degradation is indicated when the battery capacity drops more than 10% of rated capacity from its average from previous performance discharge tests, or is below 90% of the manufacturers rating.
NORTil ANNA - UNIT 1 3/4 8-4
1 ELECTRICAL POWER SYSTEMS l
l D.C. DISTRIBUTION - OPERATING I
LIMITING CONDITION F0k OPERATION 3.8.2.3 The following D.C. bus trains shall be energized and OPERABLE with. tie.
breakers.between bus trains open:
)
TRAIN "A" consisting of 125-volt D.C. bus No. 1-1 and 1-II, 125-volt D.C.
1 battery bank No. 1-I and 1-II and a full capacity charger.
TRAIN "B" consisting of 125-volt D.C. bus No. 1-III and 1-IV, 125-volt D.C.
1 battery bank No. 1-III and 1-IV and a full capacity charger.
APPLICABILITY: MODES 1, 2, 3 and 4.
I ACTION:
)
a.
With one 125-volt D.C. bus inoperable, 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 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 CHUTDOWN 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 125-volt D.C. battery and/or its charger inoperable, restore the inoperable battery and/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 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 />.
SURVEILLANCE REQUIREMENTS 4.8.2.3.1 Each D.C. bus train shall be determined OPERABLE and energized with tie breakers open at least once per 7 days by verifying correct breaker alignment and indicated power availability.
l 4.8.2.3.2 Each 125-volt battery bank and charger shall be demonstrated OPERABLE:
j a.
At least once per 7 days by verifying that:
]
1.
The parameters in Table 4.8-3 meet Category A limits and 1
2.
The total battery terminal voltage is greater than or equal to 129 volts on float charge, i
NORTH ANNA - UNIT 1 3/4 8-8 1
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l ELECTRICAL POWER SYSTEMS l
SURVEILLANCE REQUIREMENTS (Continued) b.
At least once per 92 days and within 7 days after a battery discharge where the battery terminal voltage went below 110 volts or battery overcharge above 150 volts, by verifying that:
1.
The parameters in Table 4.8-3 meet the Category B limits, 2.
There is no visible corrosion at either terminals or connectors, and j
3.
Average electrolyte temperature of 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 danage or abnormal deterioration.
2.
The cell-to-cell and terminal connections are elecu, tight and coated with anti-corrosion material, 3.
The battery charger will supply at least 200 amperes at 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 />.
4.
The resistance of each cell to_ gell and terminal connection is less than or equal to 150 x 10 ohms.
d.
At 1 cast 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 subject 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 place of the battery service test.
f.
At least once per 18 months, during shutdown, perform a performance discharge test of battery capacity if the battery shows signs of degradation or has reached 85% of its service life expected for the application. Degradation is indicated when the battery capacity drops more than 10% of rated capacity from its average from previous performance discharge tests, or is below 90% of the manufacturer's i
rating.
NORTH ANNA - UNIT 1 3/4 8-9
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L TABLE 4.8-3 BATTERY SURVEILLANCE REQUIREMENTS CATEGORY A(1)
CATEGORY B(
Parameter Limits for each Limits for each Allowable ( }
designated pilot connected cell value for each cell connected cell Electrolyte
> Minimum level
> Minimum level Above top of Level indication mark, indication mark,
- plates, and s 1/4" above and s 1/4" above ai d not maximum level maximum level overflowing indication mark indication mark Float Voltage 2 2.13 volts 2 2.13 volts ( )
> 2.07 volts 1.200( )
2 1.195 Not more than Specifig) 2 Gravity
.020 below the average of all connected cells Average of all Average of all connectyg) cells connected cells
> 1.205 2 1.195 (a)
Corrected for electrolyte temperature and level.
(b) Or battery charging current is less than (12) amps when on charge (station batteries only).
(c) For any cell with voltage below the limit and electrolyte temperature
>3 F from the average electrolyte temperature, correct the cell voltage 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 within their allowable values and provided the Category B parameter (s) are restored to within limits within 7 days.
(3) Any Category B parameter not within its allowable value indicates an inoperable battery.
NORTil ANNA - UNIT 1 3/4 8-9a
3/4.8 ELECTRICAL POWER SYSTEMS BASES 1
3/4.8.1 and 3/4.8.2 A.C. AND D.C. POWER SOURCES AND DISTRIBUTION 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 conditions within the facility.
The minimum specified independent and redundant A.C. and D.C. power sources and distribution systems satisfy the requirements of General Design Criteria 17 of Appendix "A" to 10 CFR 50.
l The ACTION requirements specified for the levels of degradation of the j
power sources provide restriction upon continued facility operation commensurate with the level of degradation.
The OPERABILITY of the power sources are consistent with the initial condition assumptions of the accident 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 OPERABLE during accident conditions coinc1 dent with an assumed loss of offsite power and single failure 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 facility 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.
The Surveillance Requirements for demonstrating the OPERABILITY of the diesel generators are in accordance with the recommendations of Regulatory Guides 1.9 " Selection of Diesel Generator Set Capacity for Standby Power Supplies," March 10, 1971, and 1.108 " Periodic Testing of Diesel Generator Units Used as Onsite Electric Power Systems at Nuclear Power Plants" Revision 1, August-1977, as modified by Amendment No. 83 issued August 22, 1986.
The Surveillance Requirements for demonstrating the OPERABILITY of the Emergency Diesel Generator batteries and the Station batteries are based on the recommendations of Regulatory Guide 1.179, " 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" as modified by Amendment No.
issued I
f NORTH ANNA - UNIT 1 B 3/4 8-1
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ATTACHMENT 2 PROPOSED TECHNICAL SPECIFICATIONS CHANGES UNIT 2 Virginia Electric and Power Company
j ELECTRICAL POWER SYSTEMS SURVEILLANCE REQUIREMENTS I
4.8.1.1.2 (Continued) 10.
Verifying that the following diesel generator lockout features prevent diesel generator starting only when required:
a) Remote Local Selection Switch j
b) Emergency Stop Switch l
e.
At least once per 10 years or af ter any modifications which could j
affect diesel generator interdependence by starting ** both diesel-generators simultaneously, during shutdown, and verifying that both diesel generators accelerate to at least 900 rpm in less than or equal to 10 seconds.
4.8.1.1.3 Each diesel generator 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 4.8-3 meet Category A limits and 2.
The total battery terminal voltage is 2129 volts on a float charge.
b.
At least once per 92 days and within 7 days after a battery discharge I
where the battery terminal voltage decreased below 110 volts or battery overcharge above 150 volts, by verifying that:
1.
The parameters in Table 4.8-3 meet Category B limits and 2.
There is no visible corrosion at either terminals or connectors.
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- This test shall be conducted in accordance with the manufacturer's recommendations regarding engine prelube and warmup procedures, and as applicable regarding loading recommendations.
l NORTH ANNA - UNIT 2 3/4 8-6 1
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l ELECTRICAL POWER SYSTEMS SURVEILLANCE REQUIREMENTS i-4.8.1.1.3 (Continued) 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.
l 3.
Theresistanceof'eachcelg-to-cellandterminalconnectionisless l
L than or equal to 150 x 10 ohms.
4.
The battery charger will supply at least ten amperes at 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 />.
d.
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.
e.
At least once per 18 months, during shutdown, perform a performance discharge test of battery capacity if the battery shows signs of degradation or has reached 85% of its service life expected for the application.
Degradation is indicatcd when the battery capacity drops more than 10% of rated capacity from its average from previous performance discharge tests, or is below 90% of the manufacturers rating.
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NORTH ANNA - UNIT 2 3/4 8-6a
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ELECTRICAL PCWER SYSTEMS D.C. DISTRIBUTION - OPERATING 1
LIMITING CONDITION FOR OPERATION 3.8.2.3 The following D.C. bus trains shall be energized and OPERABLE:
TRAIN "A" consisting of 125-volt D.C. bus No. 2-I and 2-II, 125-volt D.C.
battery bank No. 2-I and 2-II and a full capacity charger.
TRAIN "B" consisting of 125-volt D.C. bus No. 2-III and 2-IV, 125-volt
'D.C.
battery bank No. 2-III and 2-IV and a full capacity charger.
APPLICABILITY: MODES 1, 2, 3 and 4.
ACTION:
a.
With one 125-volt D.C. bus inoperable, 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 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 125-volt D.C.
battery and/or its charger inoperable, restore the inoperable battery and/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 it, 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 />.
SURVEILLANCE REQUIREMENTS 4.8.2.3.1 Each D.C. bus train shall be determined OPERABLE and energized with tie breakers open at least once per 7 days by verifying correct breaker alignment and indicated pcwer availability.
4.8.2.3.2 Each 125-volt battery bank and charger shall be demonstrated OPERABLE:
a.
At least once per 7 days by verifying that:
1.
The pm;ameters in Table 4.8-3 meet Category A limits and 2.
The total battery terminal voltage is greater than or equal to 129 volts on float charge.
NORTH ANNA - UNIT 2 3/4 8-13
ELECTRICAL POWER SYSTEMS SURVEILLANCE REQUIREMENTS (Continued) b.
At least once per 92 days and within 7 days after a battery discharge where the battery terminal voltage decreased below 110 volts or battery overcharge above 150 volts, by verifying that:
1.
The parameters in Table 4.8-3 meet the Category B limits, 2.
There is no visible corrosion at either terminals or connectors, and 3.
Average electrolyte temperature of 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 indica-tion 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 gell and terminal connection is less than or equal to 150 x 10 ohms.
l 4.
The battery charger will supply at least 200 amperes at 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 />.
d.
At least once per 18 months, during shutdown, by verifying that the battery capacity is adequate to supply and maintain in OPERABLE l
status all of the actual or simulated emergency loads for the design l
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 laast 80% of the manufacturer's rating when l
subjected to a performance discharge test.
Once per 60 month interval, this discharge performance test may be performed in place of the battery service test.
f.
At least once per 18 months, during shutdown, perform a performance discharge test of battery capacity if the battery shows signs of degradation or has reached 85% of its service life expected for the j
application.
Degradation is indicated when the battery capacity drops more than 10% of rated capacity from its average from previous performance discharge tests, or is below 90% of the manufacturer's rating.
NORTH ANNA - UNIT 2 3/4 8-14
TABLE 4.8-3 BATTERY SURVEILLANCE REQUIREMENTS CATEGORY A( }
CATEGORY B(
Parameter Limits for each Limits for each Allowable ( }
designated pilot connected cell value for each cell connected cell Electrolyte
> Minimum level
> Minimum level Above top of Level indication mark, indication mark,
- plates, and 5 1/4" above and s 1/4" above and not maximum level maximum level overflowing indication mark indication mark Float Voltage 2 2.13 volts 2 2.13 volts (")
> 2.07 volts
- I" Specjfi 2 1.200 a)
.020 below the Gravity average of all connected cells Average of all Average of all connected cella connectg) cells
> 1.205 2 1.195 (a) Corrected for electrolyte temperature and level.
(b) Or battery charging current is less than 12 amps when on charge (station batteries only).
(e) For any ecil with voltage below the limit and electrolyte temperature >3*F from the average electrolyte temperature, correct the cell voltage 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 i
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 paramerter(s) outside the limit (s) shown, the battery may be considered OPERABLE provided that the Category B parameters are within their allowable values and provided the Category B parameters (s) are restored to within limits within 7 days.
(3) Any Category B parameter not within its allowable value indicates an inoperable battery.
l NORTH ANNA - UNIT 2 3/4 8-14a I
3/4.8 ELECTRICAL POWER SYSTEMS BASES 3/4.8.a and 3/4.8.2 A.C. and D.C. POWER SOURCES AND DISTRIBUTION The OPERABILITY of the A.C.
and D.C.
power sources and associated dis-tribution 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 con-ditions within the facility.
The minimum specified independent and redundant A.C.
and D.C.
pon.r sources and distribution systems satisfy the requirements of General Desigt. Ctiteria 17 of Appendix "A" to.!0 CFR 50.
The ACTION requirements specified for the levels of degradation of the power sources provide restriction upon continued facility operation commensu-rate with the level of degradation.
The OPERABILITY of the power sources are consistent with the initial condition assumptions of the accident 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 OPERABLE during accident conditions coincident with an assumed loss of offsite power and single failure of the other onsite A.C. source.
The OPERABILITY of the minimum specified A.C.
and D.C.
power sources and ass,ciated distribution systems during shutdown and refueling ensures that 1) the facility can be maintained in the shutdown or refueling condicion for excended time periods and 2) sufficient instrumentation and control capability is available for monitoring and maintaining the facility status.
The Surveillance Re,ufrements for demonstrating the OPERABILITY of the diesel generators are in accordance with the recommendations of Regulatory Guides 1.9 " Selection of Diesel Generator Set Capacity for Standby Power Supplies," March 10, 1971, and 1.108 " Periodic Testing of Diesel Generator Units Used as Onsite Electric Power Systems at Nuclear Power Plants," Revision 1, August 1977 as modified by Amendment No. 48 issued April 25, 1985.
The Surveillance Requirements for demonstrating the OPERABILITY of the Emergency Diesel Generator batteries and the Station batteries are based on the recommendations of Regulatory Guide 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 Cencrating Stations and Substations" as modified by Amendment No.
issued Containment electrical penetrations and penetration conductors are protected by either de-energizing circuits not required during reactor operation or by demonstrating the OPERABILITY of primary and backup overcurrent protection circuit breakers during periodic surveillance.
The surveilt nce frequency applicable to molded case circuit breakers and/or fuses provides assurance of breaker and/or fuse reliability by testing at least one representative sample of each manufacturers brand of circuit breaker and/or fuse.
Each manuf acturer's molded case circuit breakers and/or fuses are grouped into representative samples which are then tested on a rotating basis to ensure that all breakers and/or fuses are tested.
If a wide NORTH ANNA - UNIT 2 B 3/4 8-1
3/4.8 ELECTRICAL POWER SYSTEMS BASES 3/4.8.1 and 3/4.8.2 A.C. and D.C. POWER SOURCES AND DISTRIBUTION (Continued) l variety exists within any manufacturer's brand of molded case circuit breakers and/or fuses, it 'is necessary to divide that manufacturer's breakers and/or fuses into groups and treat each group as a separate type of breaker or fuse for surveillance purposes.
The OPERABILITY of the motor-operated valves thermal overload protection and/or bypass devices ensures that these devices will not prevent safety-related valves from performing their function.
The Surveillance Requirements for demonstrating the OPERABILITY of these devices are in accordance with Regulatory Guide 1.106, " Thermal Overload Protection for Electric Motors on Motor-Operated Valves," Revision 1, March 1977.
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NORTil ANNA - UNIT 2 B 3/4 8-2 i
ATTACflMENT 3 DISCUSSION OF AMENDMENT REQUEST i
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Virginia Electric and Power Company
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DISCUSSION OF AMENDMENT REQUEST The proposed amendment would modify North Anna Technical Specification 4.8.1.1.3 and 4.8.2.3.2, which address the surveillance requirements for the emergency diesel generator (EDG) and station batteries. The proposed changes will result in technical specification requirements that are consistent with IEEE 450-1980, " Recommend Practice for Maintenance, Testing, and Replacement of Large Lead Storage Batteries for Generating Stations and Substations;"
" Maintenance, Testing, and Replacement of Large Lead Storage Batteries for Nuclear Power Plants;" and Westinghouse Standard Technical Specifications, (STS)
Rev.
4 (NRC approved). Additionally, these proposed changes are consistent with manufacturer recommendations for operating stationary batteries.
The proposed change incorporates the carameters for the weekly and quarterly battery surveillance requirements into table 4.8-3,
" Battery Surveillance Requirements."
The new table uses expected values and allowable values. The expected values are considered to be indicative of a fully charged battery.
Any deviation from the expected values requires correction, usually an equalizing charge, but does not necessarily constitute an inoperable battery unless one of the allowable limits have been exceeded. The proposed technical specification requires that all parameters be restored to within their expected limits within seven days.
Further, on the weekly surveillance of the pilot cell, if this cell is outside of the expected values but within the allcwable
- limits, the battery is considered operable provided that within the next 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> all connected cells are inspected and are within the allowable limits.
The battery must then be restored to its expected limits within the next 6 days.
The expected specific gravity value for the weekly test and the requirement to correct all specific gravity readings for electrolyte temperature and level are unchanged. The proposed technical specification establishes an expected value of specific gravity for the quarterly test for each connected cell to be 2 1.205 for the average of all cells with no cell less than 1.195.
This new limit is based on the recommendations of IEEE 450-1980 which indicates that an equalizing charge should be applied when the average specific gravity drops more than 10 points (.010) below the average installation value (nominal ).215) or an individual cell is more than 10 points below the average of all cells at the time of inspection.
This is also consistent with the manufacturer recommendations.
The proposed technical specification change establishes an allowable limit for specific gravity at 21.195 for the average of all connected cells with no cell more than.020 helow the average.
This limit is intended to address i
electrolyte stratifiention and cell aging.
Stratification does not affect battery capacity; however, if this condition is allowed to persist battery life may be reduced.
During the course of battery life the full charge specific l
gravity may drop up to 10 points (.010) from a nominal valve of 1.215 at the beginning of life to 1.205 at the end of life. A low float voltage or a discharge of an aged battery could result in an average specific gravity below 1.205 If the cell voltage is above 2.07 volts for the aged cells or cells with electrolyte stratification, sufficient capacity exists for the battery to 1
I L________ _ _ _
J
J perform its intended safety function. To return the effected cells to their expected specific gravity value, an equalizing charge is required.
The proposed technical specification will also allow substitution of battery l
charging or float current as indicative of an operable battery (station batteries only) when pilot cell specific gravity has decreased below the expected value or the average specific gravity of all connected cells has i
decreased below the allowable limit.
IEEE 450-1980 indicates that a stabilized I
charging or float current is an accurate indicator of battery full charge.
The 12 amp limit is based on manufacturer recommendations for calculating float current of a fully charged battery.
Charging current is a function of electrolyte temperature and will double every 15 degrees above 77*F and will be halved for every 15 degrees below 77*F.
Therefore, this parameter is not used for the EDG batteries due to the wide band cf temperatures that are expected in the EDG rooms.
The proposed technical specification establishes a conservative expected limit for cell float voltage of 2 2.13 volts on both the weekly and quarterly surveillance.
For the quarterly surveillance, any cell with a float voltage below the limit is to be corrected for temperature if the cell is more than 3 degrees from the average temperature.
If the corrected voltage is below 2.13 volts, an equalizing charge is required.
This is based on manufacturer recommendations and IEEE 450-1980, which states: prolonged operation of cells below 2.13 volts can reduce the life expectancy of the cell.
- However, the allowable acceptance 11mit for float voltage to determine battery operability remains unchanged from the present limit of 2 2.08 volts.
The total battery voltage limit has been conservatively increased from 2 125 to 2 129 volts.
This increase in total battery voltage is reflective of our intention to maintain an average float voltage per cell of at least 2.15 volts.
This is consistent with manufacturer recommendations for our N /.tery installation.
The proposed change maintains the same requirement that the electrolyte level should be maintained between the minimum and the maximum indication marks.
However, for determining battery operability, the new allowable limit for
)
electrolyte Icvel is above the plates and not overflowing.
The proposed change will require the performance of the quarterly surveillance within seven days of a severe discharge or overcharge.
For each quarterly test an inspection for corrosion of each battery terminal and connector are to be performed.
In addition, the average electrolyte temperature for the station batteries will be verified to be above 60*F.
These actions are included as good surveillance practices based on the recommendations of IEEE 450-1980 and the approved Westinghouse STS.
The surveillance requirement for the 18 month station battery service test is being revised to allow the use of simulated loads instead of the actual emergency loads.
This change is intended to clarify our current method of performing this test.
The proposed change will further allow the once per 60 month discharge performance test to be performed in lieu of the battery service test in the same year for the station batteries. This is acceptable since the discharge test conservatively bounds the results of the service test and eliminates unnecessary cycling of the battery.
It is also consistent with the approved Westinghouse STS.
Successful performance of the discharge test is 2
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indicative of the battery's capability to perform its intended function.
Additionally, the proposed technical specification will require performance of battery (EDG or station the discharge test every refueling outage for a battery) that has shown signs of degradation or has reached 85% of its expected service life for this application. This is consistent with the recommendations of IEEE 450-1980.
The purchase of a new battery analyzer will allow us to more accurately measure cell-to-cell and terminal connection resistance. With this equipment we intend maintain resistgnce for each connection, excluding cable runs, to less than to or equal to 150x10 ohms. This will reduce the overall voltage drop due to the resistance of each connection to a more acceptable value. This change is reflected in the proposed amendment for both the EDG and station battery.
10 CFR 50.91 Significant llazards Review In accordance with the provisions of 10 CFR 50.91, we are providing an analysis about the issue of no significant hazards consideration, using the standards of 10 CFR 50.92 and the guidance provided in Generic Letter 86-03.
We have concluded that these proposed changes do not involve a significant hazards consideration.
Specifically, operation of the facility in accordance with the proposed changes would not:
1.
Involve a significant increase in the probability or consequences of an accident previously evaluated. The establishment of conservative expected values for the battery parameters adds assurance that corrective actions will be taken prior to a battery degrading to an unacceptable level. The requirement to perform the battery discharge test every refueling outage once the battery has shown signs of degradation is an additional assurance that battery performance will be monitored and action taken prior to the battery reaching an unacceptable level.
- Further, the capacity of the battery is not effected by this change and the battery can perform the intended safety function assuming operation at or above the proposed limits for determining battery operability.
2.
Create the possibility of a new or different kind of accident from any accident previously evaluated.
These proposed changes do not involve any alterations to the physical plant or to procedures which would introduce any new or unique operational modes or accident precursors.
Additionally, the proposed changes are consistent with industry guidance and manufacturer recommendations.
3.
Involve a significant reduction in the margin of safety. The capacity and petrormance of the batteries are not being significantly affected by these proposed changes and the current safety analyses remains bounding; therefore, the margin of safety is not being reduced.
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