ML20148J732

Responds to Informing NRC That Util Will Mod Design of UHS Cooling Tower to Provide Tornado Missile Protec to Fans & Discharge Nozzles.Design Mod Req Change in PSAR Sections 1.9 & 9.2

ML20148J732
Person / Time
Site:	Black Fox
Issue date:	11/07/1978
From:	Ewing T PUBLIC SERVICE CO. OF OKLAHOMA
To:	Varga S Office of Nuclear Reactor Regulation
References
NUDOCS 7811160081
Download: ML20148J732 (2)

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PUBUC SERVICECOMPANY OF OKLAHOMA ,

'r A CENTRAL AND SOUTH WEST COMPANY -

P.O BOX 201/ TULSA, OKLAHOMA 74102 / (918) 583-36 i t

.'Public Service Company of Oklahoma November 7 1978 Black Fox. Station Units 1 and 2 File 6212.125.0500.21 0 i Ability of Ultimate Heat Sink to Withstand Tornado Missiles Docket STN 50-556 and STN 50-557 l

Office of Nuclear Reactor Regulation l Division of. Project Management

' Light Water Reactors Branch No. 4

. U. S. Nuclear Regulatory Commission Washington, D. C. 20555 {

Attention: Steven A. Varga, Chief l Gentlemen:

In response to your letter of October 16, 1978 on.the above subject Public Service Company of Oklahoma , commits to'mo'dify the design of the VHS cooling towers to provide tornado missile protection to the fans and discharge nozzles.

The missile spectrum to which the towers will be designed is covered in PSAR Section 3.5.3.1.

This design modification requires a' change in PSAR Se~ctions 1.9 and 9.2. In the next PSAR amendment Section 1.9, Page 1.9-22 stating the position on Regulatory Guide 1.1.17 will be changed to read as fo110ws: ,

1.117 Tornado Design Classification (Rev. 0,r6/76)

All systems, structures, and components required by this guide to be pro-  !

tected against the effects of tornados are protected by'being housed in CategoryyI. structures. The exception to this protection is the off-gas system which is located in the Turbine Building. For this system, PS0 ,

-has adopted the GE position that the release of radioactivity as a result of damage to the system by a tornado or tornado-generated missiles will not exceed 10CFR100 guidelines.

The above change to Section 1.9 and appropriate changes to Section 9.2 will be submitted in Amendment 13 to the BFS PSAR,before issuance of the BFS Construction Permits.

Very truly yours, w: :

78111600%l T. N. Ewing, Manager

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Black Fox Statio luclear Project O 4, '

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-cc: Attached- Service List VO CENTRAL AND SOUTH WEST SYSTEM c f,jww&ym---neme-wew _

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i BLACK FOX STATION SERVICE LIST XC: Mr. Cecil Thomas U.S. Nuclear Regulatory Commission Phillips Building 7920 Norfolk Avenue Bethesda, Maryland -20014 Mr. Jan A. Norris Environmental Projects Branch 3 U.S. Nuclear Regulatory Commission }

Phillips Building  ;

7920 Norfolk Avenue l Bethesda, Maryland 20014 Mr. William G. Hubacek U.S. Nuclear Regulatory Commission Office of Inspection and Enforcement Region IV 611 Ryan Plaza Drive, Suite 1000 Arlington, Texas 76012 l

Mr. Gerald F. Diddle General Manager Associated Electric Cooperative, Inc.

P. O. Box 754 Springfield, Missouri 65801 Mr. Maynard lluman General Manager i Western Farmers Electric Cooperative P. O. Box 429 Anadarko, Oklahoma 73005 i Michael I. Miller, Esq.  !

Isham, Lincoln & Beale One 1st National Plaza Suite 4200 Chicago, Illinois 60603 Mr. Joseph Gallo Isham, Lincoln & Beale 1050 17th Street N.W. j Washington, D.C. 20036 Robert A. Franden, Esq.

Green, Feldman, Hall & Woodard 816 Enterprise Bldg.

. Tulsa, Oklahoma 74103 I

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l MR STEVEN A VARGA CHIEF PUBUC SBMG COMPANYOF OKLAHOMA 0FFICE OF NUCLEAR REACTOR REGULATION DIVISION OF PROJECT MANAGEMENT LIGHT WATER REACTORS BRANCH NO. 4 PO BOX 201/ TULSA. OKLAHOMA 74102 U S NUCLEAR REGULATORY COMMISSION WASHINGTON D C 20555

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