ML20246M263
| ML20246M263 | |
| Person / Time | |
|---|---|
| Site: | Palisades  |
| Issue date: | 07/13/1989 |
| From: | NRC |
| To: | |
| Shared Package | |
| ML20246M268 | List: |
| References | |
| NUDOCS 8907190101 | |
| Download: ML20246M263 (1) | |
Text
r 4.7 EMERGENCY POWER SYSTEM PERIODIC TESTS (Continued)
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l b.
Every three months, the specific gravity of each cell, the temperature reading of every fifth cell, the height of l
electrolyte, and the amount of water added shall be measured and recorded.
At least once per refueling cycle, during shutdown, each station
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c.
battery shall be demonstrated operable by verifying that the
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battery capacity is adequate to supply and maintain in OPERABLE
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status all of the actual emergency loads for 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br /> when the
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battery is subjected to a battery service test.
d.
At least once every three refueling cycles, during shutdown, each
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station battery shall be demonstrated operable by verifying that
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the battery capacity is at least 80% of the manufacturer's rating
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when subjected to a performance discharge test. The performance
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discharge test shall be performed in lieu of the battery service
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test.
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4.7.3 Emergency Lighting The correct functioning of the emergency lighting system outside of containment shall be verified at least once each year. The emergency
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lighting system inside containment shall be verified operable prior to each removal of the reactor head.
Basis The emergency power system provides power requirements for the engineered safety features in the event of a DBA. Each of the two diesel generatora is capable of supplying the minimum required safeguards equipment from independent buses.(1,2)
This redundancy is a factor in establishing testing intervals. The monthly tests specified above will demonstrate operability and load capacity of the diesel generator. The fuel supply and various controls are continuously monitored and alarmed for abnormal conditions. Starting on complete loss of off-site power will be
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verified by simulated loss-of-power tests during refueling shutdowns.
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The emergency diesel generator limit of 750 amperes at 2400 volts
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corresponds to the manufacture's nameplate kVa and kW rating of these- /
l machines.
Considering system redundancy, the specified testing intervals for the station batteries should be adequate to detect and correct any malfunction before it can result in system malfunction. Batteries will deteriorate with time, but precipitous failure is extremely unlikely.
Ils surveillance specified for every month and every three
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months is that which has been demonstrated over the years to provide
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an indication of a cell becoming unserviceable long before it fails.
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l i
8907190101 890713 PDR ADOCK 05000235 4-43 P
PDC Amendment No. $$, 75, 102, 125 May 31, 1989 TSP 0288-0032-NLO4
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