ML19319B739

RO NP-33-77-29:on 770723,electrolyte Level for Batteries 1P,1N,2P & 2N,found Above Max Acceptable Level.Caused by Liquid Expansion at High Ambient Temps.Excess Electrolyte Syphoned Off.Revision to Tech Specs Will Allow Expansion

ML19319B739
Person / Time
Site:	Davis Besse
Issue date:	08/17/1977
From:	Beeler T, Lingenfelter J TOLEDO EDISON CO.
To:
Shared Package
ML19319B603	List: ML19319B602 ML19319B739
References
NUDOCS 8001270194
Download: ML19319B739 (2)

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[g7]l Electrolyte level in station batteries exceeded. maximum level'due to

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(gi)[ liquid expansion at high ambient temperatures. The excess el'ectrolyte .

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\. TOLEDO EDISCN CONPANY

' DAVIS-BESSE UNIT ONE NUCLEAR POWE.R STATION SUPPLEMENTAL INFORMATION FOR LER NP-33-77-29 DATE OF EVENT: July 23, 1977 FACILITY: Davis-Besse Unit 1 IDENTIFICATION OF OCCURRENCE: Electrolyte leve. above present Technical Specifi-cations for station batteries IP, IN, 2P and 2N.

Conditions Prior to occurrence: The plant was in Mode 5 with Power (MWT) = 0 and Load (MWE) = 0.

Description of Occurrence: At 1435 hours0.0166 days <br />0.399 hours <br />0.00237 weeks <br />5.460175e-4 months <br /> on July 23, 1977, when reviewing the Quarterly Battery Surveillance Test (ST 5084.01) data, the Maintenance Fore =an discovered that the battery electrolyte was above the maxi =um acceptable level.

This placed the station into the Action Statement of Technical Specification 3.8.2.4 which requires that one (1) 250/125 volt DC M.C.C. and two (2) 125 volt battery banks and chargers be energized and operable.

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\ Designation of Aeparent Cause of Occurrence: The high ambient temperature which occurred on this date was in excess of 350C (95 F) which caused an above normal cell temperature in the batteries and due to fluid expansion, an excess amount of electrolyte.

The electrolyte near the maximum level is required to pass the batterv surveil-lance test. Present Technical Specifications do not allow for thermal expan-sion with the batteries normally at this maximum 'evel.

Analysis of Occurrence: Since an excess amount of electrolyte we ald not pre-vent the batteries from meeting short term power requirements, and since the amount of excess electrolyte was removed, there was no danger to the health and safety of the public or ta station persone.cl.

Corrective Action: The excess electrolyte was siphoned from the affected battery cells and new data readings were obtained. At 1900 hours0.022 days <br />0.528 hours <br />0.00314 weeks <br />7.2295e-4 months <br /> on July 23, 1977, the batteries were declared operable. This removed the station frem Action Statement of Technical Specification 3.8.2.4. Efforts are being made to revise the Technical Specification for limits that include electrolyte (spansion.

'~' Failure Data: No previous similar events have occurred.

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