ML20210D515
| ML20210D515 | |
| Person / Time | |
|---|---|
| Site: | Cooper  |
| Issue date: | 06/09/1992 |
| From: | Horn G NEBRASKA PUBLIC POWER DISTRICT |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| NSD920469, NUDOCS 9206160189 | |
| Download: ML20210D515 (5) | |
Text
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a= usa NSD920469 June 9, 1992 U.
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Nuclear Regulatory Commission Attention:
Document Control Desk Washington, DC 20555
Subject:
Revision to Proposed Change No.
103 to Technical Specifications Cooper Nuclear Station NRC Docket No. 50-298, DPn-46
Reference:
- Letter, G.
R.
Horn to USNRC dated February 25,
- 1992,
" Proposed Change No.
103 to the Cooper Nuclear Station Technical Specifications Clarification of DC Power System" Gentlemen:
In the above reference, the Nebraska Public Power District (the District) submitted a proposed change to the Cooper Nuclear Station (CNS) Technical Specifications that would provide clarification to better define the DC System performance criteria, appropriate surveillance requirements, and actions to be taken following determination of unsatisfactory surveillance results.
Subsequent District review of this application has determined that a higher intercell resistance value is needed for the cabic-type intercell connectors. These cable-type intercell connectors (inter-rack) are required due to the CNS battery rack configuration.
4 The intercell resistance value listed in the reference is 150 x 10 ohms.
All
" regular" intercell connections (copper-bar type) between physically adjacent cells for the 250V and 125V batteries meet this criteria.
However, as discussed above, the inter-rack connections (cable-type) require a higher intercell resistance value due to the length of cable (up to 20 feet) required by the battery cell layout, and rack configuration.
These changes are resolved by certain clarifications and modifications made to the applicable Technical Specification pages that were submitted in the reference.
In addition, a new paragraph was incorporated into the bases section discussing intercell resistance values to remove a potential source of confusion.
For clarification, an editorial change was also made to the wording l
of specification 4.9. A.3.b.
The revised pages incorporating these changes are attached for consideration.
The District considers that the no significant hazards consideration contained in the rnference to still be valid.
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If you have any questions, please call.
Sincerely, i
. Horn N
ear Power Group Manager GRH/tja:pc-103.rev Attachment cc:
Regional Administrator USNRC - Region IV Arlington, TX NRC Resident Inspector Office Cooper Nuclear Station H.
R. Borchert Department of Health State of Nebraska t
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LIMITING coffDITIONS FOR OPERATION SURVEILLANCE NEOUTRFMENTS 3.9.B (cont'd.)
4.9.A (cont'd.)
l 3.
DC Power 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 Jhall be verified:
batteries is made or found to be inoperable for any reason, restore 1.
The parameters of each thw inoperable battery to OPERABLE designated pilot cell meet the 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 Category A limits in least HOT SHUTDOWN 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 />.
each 125-volt battery is 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 shall be verified that:
1.
The parameters for cell-to-cell meet the category B limits 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 lo less than or equal to 150 x 10-' ohm, and the inter-rack cable connection resistance shall be less than or
. equal to 280 x 10** ohm.
3.
The electrolyte temperatures in a representative sample of cells consisting of at least every sixth cell,' are witnin 25ar.
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 lean, tight, and-free of cortesion.
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Lit 4ITitJa coffDITTotJs FOR OPERATIO!
SURVEf t.LA11cE REOUTPD4EffTS 3.9.B.3 (cont'd.)
4.9.A.3 (cont'd.)
b.
From and after the date that a unit 3.
The resistance of each battery charger is made or found t cell-to-cell and terminal bar be inoperable, restore the connection shall be verified inoperable battery charger to to be less than or equal to OPERABLE status or replace with the 150 x 10.. ohm, and the spare battery charger within 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br /> or be in at least HOT 3HUTDok14 inter-rack cable connection 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 resistance shall be verified SHUTD0h11 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* ohm.
4.
Each 125 volt - battery charger -
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 battery charger -will supply 200 amperes at 250 volts for atlleast 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br />.
d.
Once each operating. cycle, during shutdown, one of the following tests will be performed:
1.
A battery service _ test to verify that battery capacity' is adequate to supply the emergency load profile.
2.
A performance discharge test, in lieu of the above service test, once every five years to verify that battery capacity is at least 85%
of the manufacturer's rating.
I 3.
A performance discharge. test,-
in lieu of the-above service test, when the battery shows signs of degradation or has been in service seventeen years or longer.
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L 6.9' BASES (cont'd)
When it is determined that some auxiliary electrical equipment is out of service, the increased surveillance required in Section 4.5.F is deemed adequate to provide assurance that the remaining equipment will be operable.
The surveillance requirements for demonstrating the OPERABILITY of the unit batteries are in accordance with the recommendations of NRC Pegulatory Guide 1.129,
' Maintenance Testing and Replacement of Large Lead Storage Batteries for Nuclear Power Plants, dated February 1978 and IEEE Std 450-1987, ";EEE Recemniended Practice for Maintenance, Testing, and Replacement of Large Lead Storage Batteries for Generating Stations and substations.'
once each operating cyclei during shutdown, either a service test or performance discharge 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 on-previous performance tests, or is below,851 of the manufacturer's rating.
Replacement criteria for 125V and 250V station batteries is 585% capacity factor and the maximum time for replacement should be one (1) year. This will assure that the remaining battery capacity is adequate to meet load requirements..
Verifyinc average electrolyte temperature above the minimum for which the battery was sized, cotal battery terminal voltage on float charge, connection resistance values and the performance 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.
1 Due to the physical configuration of the CNS batteries, two - dif f erent inter-cell connection resistance values are surveilled.
Each difision 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 (copper-bar type) and inter-rac
. able-type) connectors to demonstrate acceptability of battery connection resistana.
Table 3.9.1 specifies the normal limits for each designated pilot cell'and each connected cell for electrolyte level, float voltage and specific grrvity. The limits for the designated pilot celle ensure that their float voltage e ; specific gravity
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are characteristic of a charged cell with adequate - capacity, and ensures the OPERABILITY and capability of the battery.
operation with a battery coll's parameter outside the normal limit but within the allowable value specified in Tab 1S 3.9.1 is permitted for up to 7 days. During this 7-day periodt (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 ths cells, _not more than 0.02') below the manufacturer's. recommended full cnarge _ specific gravity, ensures that the decrease in_ rating will be less thanfthe saf ety margin provided in sizingt (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 andsthat the overalle capabf if ty ' of the4 battery will:be maintained within an acceptable limit;nand-(4) the allowable value-for an individual cell's float voltage,_ greater than 2.10 volts,. ensures tho' 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' I;
Protection Assemblies _ (EPA) which isolate the power sources from the RPS if the-input-voltage n.d 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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