ML20008G324

Advises That Mod to Svc Water Sys Re Addition of Piping & Valves to Allow Direct Recirculation of Svc Water to Svc Water Wet Pit,Implemented & Tested.New Valves Are Physically Locked in Desired Accident Configuration

ML20008G324
Person / Time
Site:	Farley
Issue date:	06/29/1981
From:	Clayton F ALABAMA POWER CO.
To:	Varga S, Youngblood B Office of Nuclear Reactor Regulation
References
NUDOCS 8107070315
Download: ML20008G324 (3)

Text

i. 8 Nalling Address Af;b;ma Power Company 600 North 18th Str;et Post Offics Box 2641 Birmingham, Alabama 35291 Telephone 205 783-6081 F. L Clayton, Jr. b E"; O O 7g*"' Alabama Power the souttnsta ekr!rc Syclem June 29, 1981 Docke' No. 50-348

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Office of Nuclear Reactor Regulation - "" "

U. S. Nuclear Regulatory Commission D JUL 0 61981 * %

Washington, D. C. 20555 gioet Attention: Mr.:S. A.'Vargai Y/

Mr. B. J. Youngblood '

STATUS REPORT SERVICE WATER RECIRCULATION LINE MODIFICATION FARLEY NUCLEAR PLANT UNITS 1 AND 2 Gentlemen:

This letter is to advise you that the modification to the service water system (the addition of piping and valves to allow direct recirculation of service water to the service water wet pit) as described in my letter to Messrs. Schwencer and Varga dated March 24, 1981 has been implemented and tested.

In the original concept as described in my letter, there was a design feature included solely as a convenience for plant operations and not to satisfy any safety concerns. It has been decided not to implement this featur 2 at this time although it may be installed later. The subject design featura is the automatic operation of the new valves - valves 13, 14, 15 and 16 on the attached sketch - which divert the service water from the return pond lines to the service water wet pit. In lieu of this, these valves have been physically locked in the desired accident configuration.

The only hypothesized accident during which operator action would be required to switch the new valves from diverting service water to the wet pit to returning service water directly to the pond is one involving total loss of river water. In this instance the switch would be necessary to take advantage of the full heat dissipation capabilities of the service water pond. However, the plant operators would still have time in excess of current NRC guidelines for operator action.

If you have any questions, please contact me.

Yours very truly, 9

F. L. layton, Jr.

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Attachment 810707031IB10Eh" I\

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Mr. S. A. Varga Mr. B. J. Youngblood -

2- June 29, 1981 cc: Mr. R. A. Thomas Mr. G. F. Trowbridge Mr. J. P. O'.Reilly (w/ attachment)

Mr. E. A. Reeves (w/ attachment)

Mr. J. 0.- Thoma (w/ attachment Mr. W. H. Bradford (w/ attachment Office of I & E. (w/ attachment Division of Reactor Operations Inspection

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