05000321/LER-1980-078-03, /03L-0:on 800630 & 0701,during Hot Standby Operation,Primary Containment Oxygen Concentration Exceeded Limit.Caused by Reactor Bldg to Torus Vacuum Breaker Valve Opening & Oxygen Analyzers Not Calibr.Monitoring Increased

/03L-0:on 800630 & 0701,during Hot Standby Operation,Primary Containment Oxygen Concentration Exceeded Limit.Caused by Reactor Bldg to Torus Vacuum Breaker Valve Opening & Oxygen Analyzers Not Calibr.Monitoring Increased

ML19320D544
Person / Time
Site:	Hatch
Issue date:	07/15/1980
From:	Baxley S GEORGIA POWER CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19320D539	List: 05000321/LER-1980-078, Forwards LER 80-078/03L-0 05000321/LER-1980-078-03, /03L-0:on 800630 & 0701,during Hot Standby Operation,Primary Containment Oxygen Concentration Exceeded Limit.Caused by Reactor Bldg to Torus Vacuum Breaker Valve Opening & Oxygen Analyzers Not Calibr.Monitoring Increased
References
LER-80-078-03L-01, LER-80-78-3L-1, NUDOCS 8007210492
Download: ML19320D544 (2)

LER-1980-078, /03L-0:on 800630 & 0701,during Hot Standby Operation,Primary Containment Oxygen Concentration Exceeded Limit.Caused by Reactor Bldg to Torus Vacuum Breaker Valve Opening & Oxygen Analyzers Not Calibr.Monitoring Increased

Event date:
Report date:
3211980078R03 - NRC Website

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' i2l l During Hot Standby Operation, primary containment oxvoen concentration I

o i3i iexceeded the allowable Tech. Specs. limit 3.7.A.5 of less than 4% on 1

O i4 i l6-30-80 for 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br /> and on 7-1-80 for 9 hours1.041667e-4 days <br />0.0025 hours <br />1.488095e-5 weeks <br />3.4245e-6 months <br />.

There were no effects i

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40 41 42 43 44 47 33 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h liiOi lThe cause of the event on 6-30-80 has been attributed to openina y a Rxl l Bldg. to Torus vacuum breaker valve when Torus spray was initiatt. ;o I

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NARRATIVE

REPORT Ga. Power Company Plant E. I. Hatch Baxley, Ga. 31513 REPORTABLE OCCURRENCE REPORT N0. 50-321/1980-078 On. June 30, 1980,while maintaining Hot Standby condition for HPCI testing, the 02 content of the primary containment ex-ceeded 4% when a Rx. Bldg. to suppression chamber vacuum breaker opened causing' air from the Rx. Bldg. to be drawn into the' suppression chamber.

Opening of the vacuum breaker was caused by temperature decrease of the suppression chamber air volume when Torus spray was placed in service to cool the suppression chamber air volume.

Operators initiated Np makeup and a controlled shutdown was begun.

The 02 content wds re-duced to less than 4% within 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br /> and the shutdown terminated.

On July 1, 1980, it was discovered that the oxygen concentra-tion-was over 4% when the analyzers were calibrated and returned to service.

The 0 content was found to be 4.5%.

N makeup wasinitiatedand$shutdownwasbegun.

7 The oxygen contentra-tion was returned to less.than 4% within 9 hours1.041667e-4 days <br />0.0025 hours <br />1.488095e-5 weeks <br />3.4245e-6 months <br /> and the shut-down was terminated.

Operators have been cautioned to monitor suppression chamber pressure during Torus spray operation to prevent vacuum breaker operation.

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