ML17289B256

Forwards SE Granting Licensee Request for Temporary Relief from Tornado Missile Design Criteria

ML17289B256
Person / Time
Site:	Columbia
Issue date:	03/23/1993
From:	Clifford J Office of Nuclear Reactor Regulation
To:	Sorensen G WASHINGTON PUBLIC POWER SUPPLY SYSTEM
Shared Package
ML17289B258	List: ML17289B256 ML17289B259
References
RTR-NUREG-CR-4461 TAC-M80868, NUDOCS 9303260254
Download: ML17289B256 (7)

Text

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UN)TED STATES NUCLEAR REGULATORY COMMISSION WASHINGTON, D.C. 20555-0001 March 23, 1993 Docket No. 50-397 Hr. G.

C. Sorensen, Manager Regulatory Programs Washington Public Power Supply System 3000 George Washington Way P.

O.

Box 968

Richland, Washington 99352

SUBJECT:

TEMPORARY RELIEF FROM TORNADO MISSILE DESIGN CRITERIA (TAC NO. H80868)

By letter dated February 9,

1993, you requested temporary relief from the WNP-2 tornado missile design criteria as it relates to protective soil cover requirements above the underground safety-related diesel oil storage tanks.

This relief was requested to facilitate installation of a new diesel fuel oil polishing system to be accomplished during the spring of 1993 refueling outage.

t You provided justification for the proposed relief on the basis of the low likelihood of tornado missile damage during the brief period from March 1, 1993, to August 1, 1993.

You also indicated that you have performed preliminary evaluations of certain missiles for postulated impacts above the safety-related diesel storage tanks and concluded that two feet of soil cover provides adequate protection for the tanks.

You stated that these preliminary evaluations will be formalized and verified before soil is removed.

Previously, by letter dated June 7,

1991 (Ref. 2), you requested approval of both a revision in tornado velocity, and a revision in the tornado missile spectrum.

You referenced this letter in support of your February 9,

1993, temporary relief request.

Additionally, you indicated that you had completed a review of the liter ature and performed an analysis indicating a very low probability of tornado occurrence and low tornado strength near the Hanford, Washington site.

The staff agrees that there is a sufficiently low probability of tornado damage during the time period required to complete the proposed modifications to the diesel fuel oil storage tanks (March 1 to August 1, 1993).

Your commitment to provide at least two feet of soil cover over the tanks, at all times, will provide protection for the most likely tornado missiles.

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C. Sorensen On these

bases, the staff finds the requested temporary relief from the tornado missile design criteria to be acceptable.

Our Safety Evaluation for the temporary relief from tornado design criteria is enclosed.

We will address your request for a long-term revision of tornado design criteria by separate. correspondence.

Sincerely,

Enclosure:

Safety Evaluation cc w/enclosure:

See next page J

mes W. Clifford, Senior Project Manager Project Directorate V

Division of Reactor Projects III/IV/V Office of Nuclear Reactor Regulation

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C. Sorensen March 23, i993 On these

bases, the staff finds the requested temporary relief from the tornado missile design criteria to be acceptable.

Our Safety Evaluation for the temporary relief from tornado design criteria is enclosed.

We will address your request for a long-term revision of tornado design criteria by separate correspondence.

Sincerely,

Enclosure:

Safety Evaluati'on cc w/enclosure:

See next, page I

'DISTRIBUTION Docket File NRC

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KPerkins, RV Original signed by James W. Clifford, Senior Project Manager Project Directorate V

Division of Reactor Projects III/IV/V Office of Nuclear Reactor Regulation PDV Reading File THurley/FHiraglia, 12G18

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C. Sorensen WPPSS Nuclear Project No.

2 Washington Public Power Supply System (WNP-2)

CC:

Hr. J.

W. Baker WNP-2 Plant Manager Washington Public Power Supply System P.O.

Box 968, HD 927M

Richland, Washington 99352 G.

E.

C. Doupe, Esq.

Washington Public Power Supply System 3000 George Washington Way P. 0.

Box 968, HD 396

Richland, Washington 99352 Mr. R.

G. Waldo, Chairman Energy Facility Site Evaluation Council Hail Stop PY-ll Olympia, Washington 98504 Mr. Alan G. Hosier, Licensing Manager Washington Public Power Supply System P. 0.

Box 968, HD PE21

Richland, Washington 99352 Mr. J.

V. Parrish, Assistant Managing Director for Operations Washington Public Power Supply System P. 0.

Box 968, HD 1023

Richland, Washington 99352 Hr. James C. Gearhart, Director guality Assurance Washington Public Power Supply System P. 0.

Box 968, HD 280

Richland, Washington 99352 Regional Administrator, Region V

U.S.

Nuclear Regulatory Commission 1450 Maria Lane, Suite 210 Walnut Creek, California 94596 Chairman Benton County Board of Commissioners P. 0.

Box 190

Prosser, Washington 99350-0190 Hr.

R.

C. Sorensen U. S. Nuclear Regulatory Commission P. 0.

Box 69

Richland, Washington 99352 Nicholas S. Reynolds, Esq.

Winston E Strawn 1400 L Street, N.W.

Washington, D.C.

20005-3502