ML20023C506

LER 83-035/03L-0:on 830406,offgas Hydrogen Analyzer 1A Not Maintaining Proper Vacuum & Analyzer 1B Not Wired Properly. Caused by Dirty Flame Arrestor on Analyzer A.Flame Arrestor Cleaned.Analyzer B Rewired

ML20023C506
Person / Time
Site:	LaSalle
Issue date:	05/04/1983
From:	Houston R COMMONWEALTH EDISON CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML20023C500	List: ML20023C499 ML20023C506
References
LER-83-035-03L, LER-83-35-3L, NUDOCS 8305170388
Download: ML20023C506 (2)

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61 DOCKETN6 keta 65 09 DATE 2 8 EVENT DESCRIPTION AND PROSASLE CONSEQUENCES O'o On April 6,1983 at 1500 hours0.0174 days <br />0.417 hours <br />0.00248 weeks <br />5.7075e-4 months <br /> the Off Gas "A" Hydrogen Analyzer was noted to have [

gl gg problems maintaining proper vacuum. The "1B" Analyzer would not operate properly  ;

Rad / Chem. was notified to take grab samples once per 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br /> per Tech Spec. g

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g ; 3.3.7.11. The maximum hydrogen concentration in the Rad / Chem samples was 0.08%

,,g,g hydrogen, therefore the Off Gas Hydrogen Recombiner operated properly throughout the event, g la trl l I

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lg CAusa DESCRIPTION AND CORRECTIVE ACTIONS @

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g "B" Analyzer, the purge timer was inadvertently wired ,

g g was replaced on 3/17/83 in the "B" Analyzer gi ncorrectly. The work on the "A" Analyzer was completed on 4/8/83, the g

gwiring corrected on 4/26/83.

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1. LER NUMBER: 83-035/03L-0

11. LASALLE COUNTY STATION: Unit 1 111. DOCKET NUMBER: 050-373 IV. EVENT DESCRIPTION:

On April 6',1983 at 1500 hours0.0174 days <br />0.417 hours <br />0.00248 weeks <br />5.7075e-4 months <br /> the Off Gas "1 A" Hydrogen Analyzer was noted to have problems maintaining the proper vacuum within its sampling system.

The "1B" Hydrogen Analyzer would not operate properly either. Rad / Chem was notified to collect grab samples once per four (4) hours per Technical Speci fication 3.3.7.11.

V. PROBABLE CONSEQUENCES OF THE OCCURRENCE:

At the time of the occurrence, the reactor was in the RUN Mode at 760 MWT, 240 MWE. The maximum Hydorgen Concentration in the Rad / Chem samples was 0.08% Hydrogen; therefore, the Off' Gas Hydrogen Recombiner operated properly throughout the event. Safe plant operation was maintained at all times.

Other failures of the Hydrogen Analyzers were reported in LER 82-104,82-120, 82-147, and 83-25 VI. CAUSE:

The flame arrestor in the "A" Analyzer required ~ cleaning. This caused the l vacuum problems.

I On 3/17/83 the calibration timer on the "B" Analyzer was replaced, in the l process of replacement, the purge timer was inadvertently wired incorrectly.

l This caused the "B" Analyzer to remain in the calibration mode.

These Analyzers are G. E. Model OGA 200AB.

Vll. CORRECTIVE ACTION:

Work Request #L23788 on the "A" Analyzer was completed on 4/8/83. The Analyzer sas then calibrated satisfactorily per LIS-0G-06.

l Work Request #L23913 was written on the "B" Analyzer and completed on 4/26/83. Testing on the Analyzer will be performed following Unit I startup af ter this April outage to prove satisfactory performance.

Preparea by: R. W. Houston l

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