05000366/LER-1979-066-03, /03L-0 on 790804:hydrogen Gas Concentration, Measured Downstream in Combiners,Exceeded Tech Spec Limit of 4%.Caused by Moisture That Entered Recombiner A. Design Change Request Initiated

/03L-0 on 790804:hydrogen Gas Concentration, Measured Downstream in Combiners,Exceeded Tech Spec Limit of 4%.Caused by Moisture That Entered Recombiner A. Design Change Request Initiated

ML19291A878
Person / Time
Site:	Hatch
Issue date:	08/20/1979
From:	Rogers W GEORGIA POWER CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19291A871	List: 05000366/LER-1979-066, Forwards LER 79-066/03L-0 05000366/LER-1979-066-03, /03L-0 on 790804:hydrogen Gas Concentration, Measured Downstream in Combiners,Exceeded Tech Spec Limit of 4%.Caused by Moisture That Entered Recombiner A. Design Change Request Initiated
References
LER-79-066-03L, LER-79-66-3L, NUDOCS 7908280690
Download: ML19291A878 (2)

LER-1979-066, /03L-0 on 790804:hydrogen Gas Concentration, Measured Downstream in Combiners,Exceeded Tech Spec Limit of 4%.Caused by Moisture That Entered Recombiner A. Design Change Request Initiated

Event date:
Report date:
3661979066R03 - NRC Website

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4 tJ 01 CG(A S T *.u'.*3 5 4 ed 6d EVENI DATE 74 75 RE80RT DATE W3 EVENT cssCm*TtCiJ AND PAoGABLE CoNSEOUENCE3 h 10uring startup operations at 25 M.It, the hydrogen gas concentration, measured downstreap 012 l of the recombiners, exceeded the Tech Spec Appendix B Section 2.1.3.h limit of 4%.

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i iThe hydrogen level was greater than 4% for approximately 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br /> before returning to i o la o 5 l normal. This is a; repetitive event.

There were no effects upon the public health and. ;

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' lite iThe probable cause for the event is that moisture entered the "A" recombiner in service; I thus reducing its recombining capability. The "B" recombiner was placed in service and; 11 i

I the hydrogen level returned to normal. Aninvestigation, as mentioned in the previous.LER is 2

[50-366/1979-078, has been conducted to identify and correct deficiencies in the oper-l li a

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G. E. and Bechtel representatims have reviewed the design i

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Georgia Power Company Plant E. I. Hatch Baxley, Georgia Reportable Occurrence Report flumber,50'366/1979-066 Cause Description and Corrective Actions continued and operating characteristics of the offgas ' system and have made specific recommendations.

A design change request has been initiated in response to these recommendations. The operating procedures and operator training for the equipment are undergoing review and will be revised as necessary.

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