ML20148A881
| ML20148A881 | |
| Person / Time | |
|---|---|
| Site: | Black Fox |
| Issue date: | 10/16/1978 |
| From: | Varga S Office of Nuclear Reactor Regulation |
| To: | Ewing T PUBLIC SERVICE CO. OF OKLAHOMA |
| References | |
| NUDOCS 7810300340 | |
| Download: ML20148A881 (3) | |
Text
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/* '%g UNITED ST ATES -
g NUCLEAR REGULATORY COMMISSION
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W ASHING T oN. D. C. 20555
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\\ l**v f" OCT 161978 Docket Nos:
STN 50-556 STN 50-557 Mr. T. ?!. Ewing, Manager Black Fcx Station Nuclear Project Ibblic Service Company of Oklahoma P, 0. Box 201 Tulsa, Oklahoma 74102
Dear Mr. Ewing:
SUBJEh: ABILITY OF ULTIMATE HEAT SINK TO WITHSTAND TORNAD3 MISSILES (BLACK FOX STATIO:f' UNITS 1 AND 2)
In Section 9.3.4, " Ultimate Heat Sink," of our Safety Evaluation Report related to the construction of the proposed Black Fox Station, NUREG-0190, we concluded that the ultimate heat sink, which vill consist of two mechanical draft cooling towers located on a common basin, will be adequately protected against tornado missiles. Our conc 1.usion was based on the description provided'in the Preliminary Safety Analysis Report of the design of the structures honsing the cooling towers.
The cooling tower fans and discharge nozzles will be adequately protected ngainst tornado cissiles up to an elevation of approximately
- 50. feet above plant grade by seismic Category I structural barriers.
However, upon closer examination, it dces not appear that the cooling tower discharge nozzles and fans will be protected against tornado missiles above that leve].
It is.our. position that design basis missiles such as the wood plank, steel rod, and steel pipes are capable of striking in all directions and at all elevations relative to plant structures.
In addition, in the case of mechanical draft cooling towers, we believe that even smaller debris nonna11y associated with a tornado wind field may have the potential for damging tuo fens. In view of this', we cdn not support our earlier conclusion regarding the adequacy of the tornado missile protection of.the cooling towers and, therefore, consider this matter unresc.1ved.
Accordingly, we request that within three weeSs of your receipt of this letter, you either (1) demonstrate that the ultimate heat sink cooling towers need not be relied upon to provide the i
required long-term cooling capability, or (2) mdify the design of
.the cooling towers.to provide tornado missile protection for the 781030oSpo p.
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Mr. T. N. Ewing MT 5 61978 fans and discharge nozzles. Should you desire clarification of the informatio. recuested or wish to meet with us concerning this matter, please contact Cecil Thomas, Project hhnager for the proposed lilack Fox Station.
Sincerely,
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/ Light h'ater Reacto(s Branch h'o. 4 Division of Project hhnagement cc:
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Public Service Company of Oklahoma OCT 161978 1
ces w/ encl:
Mr. Vaughn L. Conrad Sheldon J. Wolfe, Esq.
Public Service Company of Oklahoma Atomic-Safety.and Licensing. Board P.-0. Box 201 U. S. Nuclear-Regulatory Commission Tulsa, Oklahoma 74102 Washingtin, D. C.
20555 Paul.M. Mu'rphy, Esq.
Mr. Frederick J. Shon, Member Isham, Lincoln & Beale
- tomic Safety and Licensing Board
-1 One 1st National Plaza U. S. Nuclear Regulatory Commission Suite 4200 Washington,-D. C.
20555 Chicago..lllinois 60606 Dr. Paul W. Purdom Mr. Joseph Gallo, Esq.
Director, Environmental Studies Group Isham, Lincoln & Beale Drexel University 1050 17th Street, N. W.
32nd and Chestnut Street Washington, D. C.
20036 Philadelphia, Pennsylvania.19104 Dr. M. J. Robinson Black & Veatch i
P. O. Box 8405 Kansas City, Missorri 64114 4
Mr. Maynard' Human General Manager Western Farmers Electric Cooperative
'l P. O. Box 429 Anadarko, Oklahoma 73005 Mr. Gerald F. Diddle General Manager Associated Electric Cooperative, Inc.
P.O. Box'754 Springfield, Missouri 65801 Ms. Carrie Dickerson Citizens Action for Safe Energy, Inc.
P.O. Box 924 Claremore, Oklahoma 74107
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Ms. Ilene H. Younghein 3900 Cashion Place l
Oklahoma. City, Oklahoma 73112
- Andrew - T. - Dal to'n, 'J r., Esq.
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1437 South Main Street Tulsa, Oklahoma.74119-1 lie
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