ML20006F597

Proposed Tech Specs Re Surveillance Requirements of Station Batteries

ML20006F597
Person / Time
Site:	Oyster Creek
Issue date:	02/20/1990
From:	GENERAL PUBLIC UTILITIES CORP.
To:
Shared Package
ML20006F594	List: ML20006F593 ML20006F596 ML20006F597
References
NUDOCS 9002280215
Download: ML20006F597 (2)

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'c. The specific gravity, for each cell,-is. 3 3S greater than or equal-to 1.190 when corrected to 77 0F. The electrolyte temperature ofL.

, every fifth cell- (Diesel;'every fourth cell) shall be recorded for surveillance review.

fei 3. At least once each refueling. outage, the following-

[ tests will be performed.

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a. Battery service test demonstrating the battery's capacity to supply the design = duty cycle loads.

b. Battery low voltage annunciators are verified to pick up at 115 volts i 1 volt andito reset-at 125 volts i 1 volt (Diesel; 112 volts i 1 volt.

4. Demonstrate the battery capacity is at least 80%

of the manufacturer's rating when subjected to a  !

performance discharge test.

Performance tests shall be. performed at intervals  ;

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not exceeding 5 years until the battery capacity is less than 90 percent of the manufacturer's rating. ' Subsequent performance tests will be provided each refueling outage.

Basis: The biweekly tests of the diesel generators are primarily to check for failures and deterioration-in the system since last use. The manufacturer has recommended the two week test interval,. based on experience with-many of their engines. one factor in determining-this. test interval (besides checking.

whether or not the engine starts and runs) is that the-lubricating oil should be circulaced through the engine approximately every two weeks.- The diesels should be loaded to at least 20% oforated power until engine and generator temperatures have stabilized (about one hour). The minimum 20%

load will prevent, soot formation in the cylinders and injection nozzles. Operation up to-an equilibrium temperature ensures that there is no over-heat problem. The tests also provide an engine and generator operating history to be compared with' i

subsequent engine-generator test data to identify and correct-any mechanical or electrical deficiency before it can result in a system failure.

OYSTER CREEK 4.7-2 Amendment No.: 15,55,60 D

9002280215 900220 PDR ADOCK 05000219 f p PDC

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The test during refueling outages is more comprehensive, including procedures that are most effectively conducted at that time. These include automatic actuation and functional

, capability tests, to verify that the generators.can start and assume load in less than 20 seconds and testing of the-diesel generatorrioad sequence timers which provide protection from a-p <possible diesel generator overload during LOCA conditions, i Thorough inspections will detect any signs of wear long before-failure. ,

1 The manufacturer's instructions for battery. care and maintenance 'I with regard to the floating charge, the equalizing charge, and the addition of water will be followed. In addition, written records will be maintained of the battery performance. Station l

batteries will deteriorate with time, but precipitous failure is unlikely. The station surveillance procedures follow the recommended maintenance and testing practices of IEEE STD. 450 which have demonstrated, thorough' experience, the_ ability to provide positive indications of cell deterioration tendencies long before such tendencies cause cell irregularity or improper cell performance.

The battery service test is a special capacity test to-demonstrate the capability of-the battery to meet the system design requirements. The Oyster Creek design duty cycle loads are determined by a LOCA subsequent to a loss of AC power.. The H battery performance test is a capacity test on the battery to check it against the manufacturer's specified capacity and is used to determine when the battery has arrived at the end of its life.

1 OYSTER CREEK 4.7-3