ML20027D628

LER 82-033/03L-0:on 821005,1A2 Battery Cell 12 Dropped Below Tech Spec Limits,Resulting in Battery a Failure to Pass Discharge Test.Caused by Battery Age & Repetitive Discharge Testing.New 24/48-volt Dc Battery Will Be Installed

ML20027D628
Person / Time
Site:	Quad Cities
Issue date:	10/27/1982
From:	Iben C COMMONWEALTH EDISON CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML20027D624	List: ML20027D623 ML20027D628
References
LER-82-033-03L-03, LER-82-33-3L-3, NUDOCS 8211080172
Download: ML20027D628 (3)

Text

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NAC FORM 384 U. S. NUCLE A0 REIULATCCY COMMISSION 87 77)

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7 8 60 61 OOCKETNUM8ER 68 69 EVENT DATE 74 75 REPORT DATE 80 EVENT DESCRIPTION AND PROBA8LE CONSEQUENCES O'O 10121 l On October 5, 1982, the Unit One 24/48 VDC "A" Battery Test Discharge, QTS 120-2, wasl gl pe r fo rmed. The I A2 battery cell number 12 dropped to .13 VDC(1.75 VDC required l o 4 l minimum) between six and seven hours into the eight hour test. This dropped the "A" l IO isi l ' battery voltage below the required 21 volts at 10 emps and therefore, the "A" l battery failed to pass the discharge test as required by Technical Specification l 016 i I 4.9.B.3. The "A" battery could have provided eiriht hours of power at actual load I conditions (5.5 amps), in addition, the "lB" 24/48 volt battery was found l0l7ll operable and would have provided power for the other redundant half of the l 24/4G VDC instrumentation.

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33 34 35 36 37 40 41 43 44 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h 1 10ll The pross failure of cell 12 of the IA2 24/48 VDC volt battery caused the "A" 1 L.'_L'_J l battery to fail its discharae test. This failure has been attributed to batterv I

, 2 I age and repetitive discharge testing. A new "A" 24/48 VDC will be Installed prior l l i 3 5-l l to Unit One startup. l i

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30 5 NAME OF PREPARER PHONE:

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. 1. LER NUMBER: LER/R0 82-33/03L-0

11. LICENSEE NAME: Commonwealth Edison Company.

Quad-Cities Nuclear Power Station Ill. FACILITY NAME: Unit One IV. DOCKET NUMBER: 050-254.

V. EVENT DESCRIPTION:

On October 5,1982, QTS 120-2, Quad-Cities ' unit one 24/48 VDC "A" Battery Test Discharge was being performed. Technical Specification j 4.B.3 requires that the 24 VDC battery be discharged at ~ a manufacturer's amp-hour rated capacity of ten amperes for eight hours (80 amp hours).

This test criteria is specified in IEEE Standard 450-1975 At some interval between the sixth and seventh hour of the discharge test, the Unit One IA2-24 VDC battery terminal voltage dropped below the minimum-specified battery voltage of 21 volts, as per IEEE 450-1975 Cell 12 voltage of the IA2 battery fell below the minimum specified cell voltage (1.75 VDC) to 0 31 VDC, which indicated cell replacement was necessary. The estimated minimum capacity of the I A2-24 VDC battery

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at a 10 ampere discharge . rate was 75 percent of the manufacturer's specification.

VI. PROBABLE CONSEQUENCES OF THE OCCURRENCE:

Load trend -review on the I A2-24 VDC -battery indicates that operating load on the battery would be approximately 5 5 amperes. Had the need arisen, the IA2 battery would have performed its function as required, and, maintained operation for the minimum of eight hours required.

In addition, the "1B" 24/48 VDC battery was found to be completely operable and would have provided power for the other half of the

- requi red 24/48 VDC instrumentation.

Unit One was in the REFUEL mode and in Cold Shutdown. The fuel had been completely removed from the vessel, therefore, the battery was

[ not require'd to be operable at the time of the test.

Vll. CAUSE:

j The direct cause of this event is gross failure of cell 12.in the IA2-24 VDC battery. The other 11 cells were still well above the 1.75 VDC minimum cell voltage. Failure of the cell has been attributed to the near end-of service life of the 24/48 VDC battery and repetitive dis-charge testing of- the battery.

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m Vill. CORRECYlVE ACTION:

Due to the failure of the 2A2-24 VDC battery (DR 4-2-81-53) in. January, 1981, the 24/48 VDC batteries were evaluated. It was decided to replace all of the 24/48 VDC batteries. The lA and IB 24/48 VDC batteries are scheduled to be replaced before the end of this refueling outage.

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