ML20080E860

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Discusses Time at Which Hydrogen Monitoring Is Initiated. Intent of TMI Item II.F.1(6) Is to Ensure Timely Hydrogen Monitoring in Event of Core Uncovery During Loca.Definition for Onset of LOCA Undefinable
ML20080E860
Person / Time
Site: Hatch  
Issue date: 02/03/1984
From: Gucwa L
GEORGIA POWER CO.
To: Stolz J
Office of Nuclear Reactor Regulation
References
RTR-NUREG-0737, RTR-NUREG-737, TASK-2.F.1, TASK-TM NED-84-047, NED-84-47, TAC-47604, TAC-47605, TAC-47746, TAC-47747, NUDOCS 8402100179
Download: ML20080E860 (2)


Text

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,. Georgia Power Cornpany 333 Piedmont Avenue Atlanta. Georgia 30308 Telephone 404 5264526 Maing Address:

Post Office Box 4545 Atlanta, Georgia 30302 Georgia Power L T.Gucwa the soutnern electnc system Manager Nuclear Engineering and Chef Nuclear Engineer i

February 3, 1984 Ditector of Nuclear Reactor Regulation Attention: Mr. John F. Stolz, Chief Operating Reactors Branch No. 4 Division of Licensing j

U. S. Nuclear Regulatory Comission Washington, D. C. 20555 NRC DOCKETS 50-321, 50-366 OPERATING LICENSES DPR-57, NPF-5 EDWIN I. HA'ICH NUCLEAR PIANT UNITS 1, 2 NUREG-0737 FITM II.F.l(6), CONTAIl@ENT HYDROGEN MONI'IOR Gentlemen:

1 Our sutaittal dated April 19,_ 1983.provided information for~ the post-implenentation review of the subject NUREG-0737 iten.-

Recent discussions with Mr. George Rivenbark, Hatch Licensing Project Manager, have indicated the need to clarify a point which was made in that sutnittal.

We point in question is the time at which hydrogen monitoring is

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initiated.

Iten II.F.l(6) requires that continuous indication and recording of contairnent hydrogen concentration be functioning within 30 minutes of the initiation of --- safety injection.

'Ihe intent of this requirenent, as interpreted by GPC, is to ensure timely hydrogen monitoring in the event of core uncovery during a loss of coolant accident (IOCA).

In _ the above referenced sutaittal it was proposed that the onset of a IOCA be used as the criterion for the need for hydrogen monitoring.

% is was considered a-more j

appropriate criterion because of the potential cases of ~ safety injection in:

a BWR (e.g. - High Pressure Coolant Injection) which would not be indicative of a IOCA.

In _ the' course of developing Technical Specifications _for j

contairnent hydrogen monitoring, however, we were unable to define the onset--

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of a IOCA in a manner which would ensure hydrogen monitoring within _ 30 minutes'of the entire spectrtn _ of breaks. -It 'is for this reason = that ECCS actuation durlag a IOCA : was specified as the starting - point for the-30 minute response time in our December 21, 1983 Technical: Specification 1

sutmittal.

This strategy enveloos all breaks which could lead to the need

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for hydrogen monitoring.

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GeorgiaPower A Director of Nuclear Reactor Regulation Attention: Mr. John F. Stolz, Chief Operating Reactors Branch No. 4 February 3, 1984 Page 'IWo We trust that this information clarifies the apparent discrepancy between our April 19, 1983 and Decenber 21, 1983 subnittals. Please contact this office if there are any questions.

Very truly yours, hV W L.T. Gucwa i

JH/ nw xc: J.T. Beckhan, Jr.

H.C. Nix, Jr.

P.D. Rice J.P. O'Reilly (NRC-Region II)

Senior Resident Inspector t

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i 700775

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