ML20062G901

Forwards Consultant'S Rept Re Impact Force on Fuel Assembly Spacer Grids,Caused by Asymmetric Loads During Blowdown Following a Loca.Grids May Be More Sensitive to Core Plant Motion than Originally Believed

ML20062G901
Person / Time
Site:	Diablo Canyon
Issue date:	09/19/1978
From:	Goddard R NRC OFFICE OF THE EXECUTIVE LEGAL DIRECTOR (OELD)
To:	Bowers E, Bright G, Martin W Atomic Safety and Licensing Board Panel
Shared Package
ML20062G899	List: ML20062G894 ML20062G901
References
NUDOCS 7903050236
Download: ML20062G901 (5)

Text

. ., .

• [ "'*, UNITED 5f 4TES

• NUCt. EAR ncGULATORY COMMisslON

= ,..

WASHINGTON, D. C. 20555

. f. /i h G.,',,,.-

,d"h,/;l September 19, 1978 Elizabeth S. Bewers, Esq., Chairman Mr. Glenn 0. Br'ight Atomic Safety and Licensing Board Panel Atcmic Safety and Licensing Ocard U.S. iluclear Regulatory Commission Panel U.S. t!uclear Regulatory Ccemissicn Washington, D. C. 20555 Washington, D. C. 20555 Dr. William E. f4artin Senior Ecologist " i ao "

Battelle Memorial Institute f p .g g Columbus, Chio 43201 i 47 T f- N In the Matter of b . $g ,R Pacific Gas and Electric Company Thg

2) :'pV yp (Diablo Canyon fluclear Power Plant, Units i!cs.1 Docket flos. 50-275 0.L. and 50-323 0.L.  %,

8u t

Dear flembers of the Board:

The results of analyses performed for the :lRC Staff by a consultant indicate that the impact force en fuel assembly spacer grids, caused by asymetric loads during bicwdcwn following a 1 css-of-coolant accident,

' may be more sensitive to core plate motion than it was originally believed to be. A cocy of the consultant's menorandum en this subject .

dated !!ovember 4,1977, is enclosed. As noted, the infomation is

- preliminary. Therefore, the Staff's conclusien that pressuri:ed water reactor fuel assently designs are acceptable has not been altered.

Hcwever, a questien has been raised about the margin to deferraticn of the fuel assembly grids.- ,

,,y - * . , _ . . .

The ilRC Staff and its censultant are continuing their evaluation of fuel assembly mechanical respense.

Sincarely.

( 5 4p:.J J..q  ;-

Richard J. Ge Jard Counsel for ::RC Staff Enclosure cc (see page 2)

. 7003050 A.34

. .~ _.

o' cc (w/ encl.):

Philip A. Crane, Jr., Esq.

Mrs. Eli:abeth Apfelberg Mrs. Raye Fleming Mr. Frederick Eissler Mrs. Sandra A. Silver

!!r. Gcrden Silver Richard B. Hu'cbard Paul C. 'laientine, Esq.

Yale I. Jcnes, Esq.

John R. Phillips, Esq.

David F. Fleischaker, Esq.

Arthur C. Gehr, Esq.

Janice E. Xerr, Esq. .

Mr. James 0. Schuyler John Marrs Bruce florten Atomic Safety and Licensing Board Panel Atemic Safety and Licensing Appeal Panel Docketing and Service Section i

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