ML20045C003
| ML20045C003 | |
| Person / Time | |
|---|---|
| Site: | Cooper  |
| Issue date: | 06/14/1993 |
| From: | NEBRASKA PUBLIC POWER DISTRICT |
| To: | |
| Shared Package | |
| ML20045C001 | List: |
| References | |
| NUDOCS 9306210376 | |
| Download: ML20045C003 (3) | |
Text
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i I'IMITIUr; CONDITIONS FCP OPEPATICN SUFVEILLANCE FEOUIREMENTS-13.9.B' (cont'd.)
4.9.A (cont'd.)
,1 1
l 3.
-DC Powar 3.
DC Power a.
From and after the date that one of a.
Every week, the following parameters the four unit 125 volt or 250 volt shall be verified:
batteries is made or found to be inoperable for any reason, restore 1.
The parameters of.
each.
the inoperable battery to OPERAELE designated pilot cell meet the ctatus 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 Category A limits in least HOT CHUTDOWN within the next Table 3.9.1.
12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> and in COLD SHUTDOWN within 2.
The total terminal voltage'for-the following 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />.
ed 125-v m bmm b
greater than or equal
.to 125 volts on-float charge, and for each 250-volt battery the terminal _ voltage is. greater than or equal to 250 volts on float charge.
b.
Every quarter, and within. 7 days after a battery discharge causing battery terminal voltage below 105 volts for a.125-volt battery.or 210 volts for a 250-volt battery, or battery overcharge with-battery-terminal voltage above 140. volts for a 125-volt battery'or 280 volts'for.
a 250-volt ' battery, it chall be verified that:
1.
The-parameters for cell-to-cell meet t h e..
Category B.
1imits.
in Table 3.9.1.
2.
-There is no abnormal corrosion at either terminal-or connectors which could affect connection resistance, or the bar connection resistance of these items is less than or equal to 15 0. x 10-* ohm, and the inter-rack c a b l'e connection resistance shall be less than or equal to 280 x 10~' chm.
3.
The electrolyte temperatures-in a representative sample of
- cells, has an average temperature of at least 70oF.
c.
Once each operating cycle:
1.
The cells, cell ' plates, and battery racks
.shall be visually-inspected.
2.
The cell-to-cell and terminal connections shall be verified.
to be clean, tight, free of corrosion.
'and coated' with-anti-corrosion material.
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4.9.A 3-(cont'a.
f b;
From and af ter the date that a unit Th+
r+sistance of each a
battery charger is made.or fcund to cell-to-cell and terminal bar he inoperable, restore the connection shall be verified r
inoperable battery
'charaer to OPEP.ABLE status or replace with the
'than or equal to
'e. Aess spare battery charger within 4 houra p0
- 10^ chm and
.tihe inter-rack cable connection i
or be in at least HOT SHUTDOWN within the next 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> and in COLD resistanc+ chall be verified:
SHUTDohH within the following to be less than or equal to 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />.
280 x 10' chm.
4.
Each 125 volt battery charger l
will supply 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 />, and each 250-volt ~
t battery charger will supply 200 amperes.at 250 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.
Once each cperating cycle, during
. shutdown, one of the following tests will be performed:
r 1.
A battery service test to verify that battery capacity is. adequate _ to supply the emergency load profile.
t 2.
A performance discharge test, t
in lieu of the above service-test, once every five years to verify that batteryscapacity.-
is-at.
least
- 901,
'of the l
l raanufacturer's' rating.
3.
A perf ormance discharge test, in lieu of the above service test, when the battery shows-signs et degradation or has been in service seventeen years or longer.
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4.9 INE (cent'd; dhen it is determined that scme aun.iary -lectrical equipment is out of sertice, the increased surveillance required ;r Zect len 4. c.F is deemed adequat+ to provide assurance that the remaining equipment will be cperable.
The surveillance requirements f or demonstratang the OFERABILITY of the unit batteries are in accordance aith the reconmendations of NRC Regulatory Guide 1.129,
" Maintenance Testing and Replacement cf Large Lead Storage Batterles for Nuclear Power Plants, dated February 1978 and IEEE Std 450-1987, "IEEE Recommended _ Practice for Maintenance, Testing, and Replacement of Large Lead Storage Batteries for.
Generating Stations and Substations."
Once each operating cycle, during shutdown, either a servir e test or performance diccharge is performed on the 125 V and the 250 V batteries.
The performance discharge test is performed in lieu of the service test when a battery shows signs of degradation. Degradation is indicated when battery capacity drops more than 10%
of rated capacity f rom its average en previous perf ormance tests, or is below 90% of the manufacturer's rating.
Replacement criteria for 125V and 250V ctaticn batteries is 580% capacity f actor and t he maximum time for replacement should be ene (1) year.
This will assure that the remaining battery capacity ic adequate to meet load requirements.
Verifying average electrolyte temperature above the minimum for which the battery was sited, total battery terminal voltage en float charge, connection resistance values and the perf ormance of battery service and discharge tests ensures the ef fectiveness of the charging system, the ability of the battery to handle high discharge rates and compares the battery capacity at that time with the rated capacity.
Due to the physical configuration of the CNS batteries, two different inter-cell connection resistance values are surveilled.
Each division of the 125V and 250V batteries are configured into two racks, coupled with inter-rack connectors.
Therefore, separate resistance values are-provided for both the inter-cell t ecpper-bar type) and inter-rack (cable-type) connectors to demonstrate acceptability of battery connection resistance.
Table 3.9.1 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 decignated pilot cells ensure that their float voltage and specific gravity are characteristic of a charged cell with adequate capacity, and ensures the OPERABILITY and capability of the battery.
Operation with a battery cell's parameter cutside the normal limit but within the allowable value specified in Table 3.9.1 is permitted f or up to 7 days. During this 7-day period:
(1) the allowable "alues for electrolyte level ensures no physical damage to the plates with an adequate electron transfer capability; (2). the allowable calue for the average cpecific gravity of all the cells, not more than C.020 below the manuf acturer's recommended f ull charge specific gravit'/, ensures that the decrease in rating will h less than the caf ety margin provided in sizing; (3) the allowable value for an individual cell's specific gravity ensures that an individual cell's specific gravity will not be more than 0.020 below the average specific gravity of all connected cells and that the overall capability of the battery will be. maintained within an acceptable limit; and (4) the allowable value for an individual cell's float voltage, greater than 2.10 volts, encures the battery's capability to perform its design function.
The Reactor Protection System (RPS) is equipped with a seismically qualified, Class 1E power monitoring system.
This system consists of eight Electrical' Protection Assemblies (EPA) which isolate the power sources fred the RPS if the input voltage and frequency are not within limits specified for safe system operation.
Isolation of RPS power causes that RPS division to fail safe.
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