ML20040G802

Application for Amend to License DPR-57 Changing Tech Specs to Allow Temporary Extension of 24-h Limiting Condition for Operation of Drywell Inerting to 72-h

ML20040G802
Person / Time
Site:	Hatch
Issue date:	02/08/1982
From:	Widner W GEORGIA POWER CO.
To:	Office of Nuclear Reactor Regulation
References
TAC-47885, TAC-54378, TAC-54379, NUDOCS 8202160488
Download: ML20040G802 (2)

Text

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Director of Nuclear Reactor Regulation 5' FEB 1~61982> L8 '

U. S. Nuclear Regulatory Commission R wst macm tuman y '/

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NRC DOCKET 50-321 O N. -

k OPERATING LICENSE DPR-57  :

EDWIN I. HATCH N'JCLEAR PLANT UNIT 1 1.

IMMEDIATE RELIEF FOR DRYWELL INERTING u TECHNICAL SPECIFICATION ~

m Gentlemen: .

Pursuant to 10 CFR 50.90, as required by 10 CFR 50.59(c), Georgia Power ,

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Compan/ proposes an amendment to the Unit 1 Technical Specifications (Appendix A to the Operating License). ~..

Technical Specification 3.7. A.5.b requires "within the 24-hour period .

subsequent to placing the reactor in the RUN mode following a shutdown, the ..

containment atmosphere oxygen concentration shall be reduced to less than 4% -

by volume and maintained in this condition". However, during the startup of -

February 7, 1982, it became apparent that there was an insufficient amount y ,.

of liquid nitrogen available to meet this 24-hour LCO. Additionally, J, resupplies are not available until after the LCO expires. We hereby request =, ^

a one time extension of the 24-hour LCO to 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> beginning at 3 p.m. EST ,

on February 7, 1982. Minimum levels (2000 gallons) of nitrogen are being - -

maintained to preserve operability of the Containment Atmosphere Dilution .

(CAD) system per Technical Specification 3.7.A.6.b. /',

Safety Evaluation - Drywell Inerting {, ,

The basis for a 24-hour requirement on attaining a 4 percent oxygen '

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concentration following entry into the RUN mode is to minimize the possibility of hydrogen combustion following a loss-of-coolant accident. .t. ,

The 24-hour period was established, as stated in the bases for specification .

3.7.A.5, as being sufficient to perform necessary drywell inspections and ie -

establish the required oxygen concentration. The control is administrative * -

and supplements the CAD system.

The CAD system provides the basis for assuring containment integrity J -

post LOCA. Due to the license date for Unit 1, the CAD system was installed :p to meet the then applicable regulations addressing hydrogen evolution. In - *

.. j order to meet the currently applicable interim final rule, capability to install portable hydrogen recombiners is being engineered, and, therefore, P-Georgia Power Company is in compliance with the regulations.

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GeorgiaPowerA Director of Nuclear Reactor Regulation U. S. Nuclear Regulatory Commission Washington, D. C. 20555 February 8, 1982 Page Two Because the 24-hour limit is an administrative control, as opposed to providing a safety function, margins of safety, as defined in the Technical Specifications, are not reduced by allowing a longer period of time to complete drywell inerting. The safety margin is provided by the CAD system.

Additionally, due to plant factors, a maximum thermal power level of less than 50 percent will be reached during the requested period of extension. We estimate that in the expected rod pattern, margins to the MAPLHGR limit shoald approach 50 percent, providing .cdditional conservatism to the analysis accident conditions.

Extension of the drywell inerting LCO also necessitates an extension of the LCO for Tecnnical Specification 3.7. A.7.(1), Drywell-Suppression Chamber Differential Pressure, for a like time period. Required differential pressure cannot be established until inerting is complete.

This submittal is for immediate relief. A formal submittal, including determination of amendment class, will follow.

W. A. Widner states that he is Vice President of Georgia Power Company and is authorized to execute this oath on behalf of Georgia Power Company, and that to the best of his knowledge and belief the facts set forth in this letter are true.

l GEORGIA POWER COMPANY l

By: dtM,/

W. A. Widner Sworn o and subscribed before me this 8th day of February, 1982.

/ // Notary Public, Georgia. State at Large (Q ,

Q My Commission Empires Sept. 20,1983

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Notary Public REB /mb l

xc: M. Manry R. F. Rogers, III J. P. O'Reilly (Region II - NRC)