ML20147B151

/03L-0 on 780831:during Monthly Specific Gravity Readings on Reactor Depressurization Sys,Battery A,Cell 12 Read 1.193 Below Limit of 1.200 Specified in Tech Specs. Cause Unknown & Cell Was Replaced.(Encl to 7810060072)

ML20147B151
Person / Time
Site:	Big Rock Point File:Consumers Energy icon.png
Issue date:	09/27/1978
From:	CONSUMERS ENERGY CO. (FORMERLY CONSUMERS POWER CO.)
To:
References
LER-78-034-03L, LER-78-34-3L, NUDOCS 7810060077
Download: ML20147B151 (1)

Text

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? 8 66 69 DATE 76 EVENT DESCRIPTION AND PROBABLE CONSEQUENCES h F6TF1 1 During monthly specific gravity readings on the Reactor Depressurization Io1311 System Battery A, Cell 12 read 1.193. This is below the limit of 1.200 l I o 14 i ispecified in T/S 11.4.5.3.A.2.(b). All other cells met specifications and j ioIsl I previous evaluation indicates that the channel was operable for this condi-l m ; tion. The battery was placed on equalizing charge on 8/31/78. Incident ,

goj7; l repetitive; see R0-77-39 dated 10/27/77, R0-77-50 dated 1/13/78 and R0 l ioisil 02 dated 2/17/78. t

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lilolI Exact cause of failure is unknown. The cell did not respond adecuatelv to I li1311 the equalizing charge initiated on 8/31/78. Since the en11 hnn exhibited I

,,,,,l marginal performance over the past year, even following electrolyte addi- 1 i,,3, l tion, the cell was replaced with a new cell on 9/7/78. I lii.ii I

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