ML19350C386

LER 81-028/03L-0:on 810224,oxygen Analyzer Declared Inoperable.Caused by Damaged Oxygen Cell Due to Collection of Condensed Moisture.Lines Cleared,Cell Replaced & Analyzer Recalibr.Addl Vents Will Be Added

ML19350C386
Person / Time
Site:	Sequoyah
Issue date:	03/24/1981
From:	Harding M, Wilkey A TENNESSEE VALLEY AUTHORITY
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19350C385	List: ML19350C384 ML19350C386
References
LER-81-028-03L, LER-81-28-3L, NUDOCS 8104010266
Download: ML19350C386 (2)

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f'5 TTI I With unit 1 in Mode s. the oxveen analyzer used to monitor for an exolosive ens mixtura g-ITTTII in the waste' holdup ' tank was declared inoperable. Gr'ab samples.were taken within foor l I n l41 l hours.as required Ev action statement'43 of LCO 3.3.3.10, but the samples were not l lol3l l analyzed for approx'imately twelve hours because both gas chromatographs used for*this 'g l o l61 l analysis were fnoperable. There was no ef fect on publik: health oY safety. No previous g

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l i j o l l The" oxygen' cell was d'amaged due to the' collection of condomad mM dntra in the a alvzer. 1 li li j l The water was cleared from the lines, the cell was replaced, the analyzer was recalibratedi

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LER SUPPLEMENTAL IhTORMATION 3.3.3.10 SQRO-50-327/81028 Technical Specification Involved:

Reported Under Technical Specification: 6.9.1.13.b Date of Occurrence: 2-24-81 Time of Occurrence: 1250 CST Identification and Description of Occurrence:

The oxygen analyzer used to monitor for an explosive gas mixture in the waste holdup tank was declared inoperable when water damaged the oxygen cell. Grab samples were taken as required by action statement 43 of LCO 3.3.3.10 but analysis of the samples was delayed for approximately 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> because both gas chromatographs used for the analysis were inoperable.

Conditions Prior to occurrence:

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Unit 1 in Mods 5 Apparent Cause of Occurrence:

Condensed moisture collected in the analyzer and damaged the oxygen cell. 1

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Analysis of Occurrence _: [

Analysis of the gas sample was delayed until a loan unit could be obtaine,d from the Power Operations Training Center. Subsequent analysis verified that the sampled gas was within technical specification limits.

Corrective Action: ,

A design modification will be implemented prior to fuel loading of Unit 2 to install additional low-point vents to eliminate the collection of excessite water in the lines connected to the analyzer.

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