ML20197C348

Rept on Tornado Damage on 780417 at Subj Facil.Found No Evidence During 780419 Site Visit of Significant Missile Motion.Cooling Tower Damage Caused by Falling Cranes

ML20197C348
Person / Time
Site:	Grand Gulf
Issue date:	04/26/1978
From:	Costello J NRC OFFICE OF STANDARDS DEVELOPMENT
To:	Vollmer R Office of Nuclear Reactor Regulation
Shared Package
ML20197C120	List: ML20197C117 ML20197C136 ML20197C150 ML20197C236 ML20197C256 ML20197C260 ML20197C289 ML20197C327 ML20197C348 ML20197C359 ML20197C380 ML20197C397
References
REF-GTECI-A-38, REF-GTECI-IT, TASK-A-38, TASK-OR NUDOCS 7811210066
Download: ML20197C348 (3)

Text

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9 MEMORANDUM FOR: Richard H. Vollmer, Assistant Director for Site Analysis, DSE FROM: James F. Costello, Task Manager, A-38

SUBJECT:

TORNADO DAMAGE AT GRAND GULF SITE The tornado which damaged the Grand Gulf plant during the night of April 17 will probably be classified as F1 or F2 on the Fujita scale.

Thus, it is not surprising that the visit to the site, on April 19, ,

by an NRC team consisting of myself, H. Fontecilla of D0R and C. R.

McFarland of Region II, yielded no evidence of motion of significant missiles. Damage at the plant, while of considerable dollar value, was consistent with peak wind velocities in ',c.e 100-150 mph range.

The attached sketch shows, approximately, the direction of the tornado and the major damage areas. Aerial photographs will soon be available l in a report from Professor Fujita, of the University of Chicago, who surveyed the site as part of an investigation of the three tornadoes '

reported in southwestern Mississippi that night. The areas suffering major direct wind damage were the batch plant and switchyard. No significant missiles were noted in these areas. Busbars lay where .

they ' fell and only sheet metal and trailers were displaced significant distances from the batch plant lucation. Damage to the cooling tower, containment, and turbine buildhg of Unit 1 was caused by falling construction crnes--not wind forces or missiles.

. Some input to Task Action Plan A-38 may be gotten from an analysis of happenings in the upper laydown area to be performed by Professor Mcdonald of Texas Tech University. Some moderate motion of large fiberglass pipes occurred there which, when combined with final wind-speed estimates, may shed some light on incipient motion of missiles of pipe variety.

CONTACT: J. F. Costello 443-5420 7811210a %

L 3 ,.

Richard H. Vollmer APR 2 6 1976 a -

Finally, I should say %at the cooperation we received from Mississippi Power & Light officials was excellent and that Bob McFarland, of Region II,reallyextendedhimselftobehepfultous. -

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Jam - F. Costello Engineering Methodology Standards Branch Office of Standards Development ,

Enclosure:

Sketch cc w/ enc 1: H. Fontecilla, D0R C. R. McFarland, Region II .

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