ML20028C435

Responds to IE Bulletin 78-03, Potential Explosive Gas Mixture Accumulations Associated W/Bwr Offgas Sys Operations, Per NRC 780210 Ltr.Emergency Procedures Will Be Implemented by 780930

ML20028C435
Person / Time
Site:	Hatch, 05000000
Issue date:	03/22/1978
From:	Staffa R GEORGIA POWER CO.
To:	James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML20027A594	List: ML20028C411 ML20028C420 ML20028C424 ML20028C428 ML20028C431 ML20028C433 ML20028C435 ML20028C437 ML20028C443 ML20028C446 ML20028C449 ML20028C451
References
FOIA-82-545, REF-SSINS-6820 IEB-78-03, IEB-78-3, NUDOCS 8301100139
Download: ML20028C435 (2)

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Power Supply Engineering and Services CeOrgia Power we scurnem e ect:c usier March 22, 1978 United States Nuclear Regulatory Co==ission Office of Inspection and Enforce =ent

REFERENCE:

Region II - Suite 1217 RO: II: JPO 230 Peachtree Street, N.W. 50-321 Atlanta, Georgia 30303 ATTEdrION: Mr. Ja=es P. O'Reilly Gentle =en:

The following infor=ation is submitted in response to your letter of February 10, 1978, requesting infor=ation cencerning II Bulletin 7E-03.

The nu= bering sequence used herein is the same as that used in the Bulletin.

1. A review of all operating procedures has been conducted. Based on this review we find our procedures to be adequate to =eet the syste='s design cbjectives. Although there are no proce-dures prohibiting welding on the offgas syste= which =ight result in an ignition by an are strike, there are several =ea-sures which serve this purpose. First, a welding permit is required before any velding is perfor=ed. Second, a =aintenance riquest is needed before work is allowed to proceed in an area.

As a result, guidance to workers is provided by personnel know-ledgeable of the dangers of such an ignition source. The offgas syste= presently has purge capabilities; this provides additional assurance that welding can be co=pleted safely.

2. The design of the offgas system does not =ake use of any rupture disks or allow bypassing the recombiners. Loss of dilution flow is annunciated in the =ain control roo=. Hydrogen cencentration is =enitored at the exit of the reco=biners. Additionally, opera-tion above 1% is alar =ed and above 4% hydrogen is not per=itted for extended periods without a unit shutdown. These =easures will prevent release of hydrogen or fission product gasses to the environs.

364. The only location using loop seals open to the environ =ent is the Waste Gas Treat =ent Building. This building has a ventilation system which routes contaminants to the =ain stack. Operating procedures cover the startup of the offgas syste= when pressure surges are =ost likely to occur. Should a loop seal blow out, the radiation =enitoring syste=s will detect the event and alar = in the =ain control roo=. Operating personnel are capable of quickly restoring these loops by use of a de=ineralized water refill line.

8301100139 821207 PINT FOIA HIATT82-545 PDR '

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~ Georgia Power b C.S. Nuclear Regulatory Commission ATTN: t. Ja=es ?. O'Reilly

'Page Two March 22, 1978

5. ' We are planning to develop an emergency procedure for handling offgas system conditions which threaten the integrity of the system. We expect these procedures to be implemented by Sep-tember 30, 1978.

Please contact my office should you require additional information.

Very truly yours,

/s4 e l~

R. W.,Staf a

/ ansfer N of' Qua h ty Assurance CTM: '/bg - -

-xc: U. S. Nuclear Regulatory Cocruission

• Office of Inspection and Enforcement Division of Reactor Operations Inspection Washington, D. C. 20555 i ,

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