ML20127H179

Forwards Request for Addl Info Re Preliminary Rept of Fuel Cask Drop Accident Analysis, within 10 Days

ML20127H179
Person / Time
Site:	Monticello
Issue date:	01/31/1975
From:	Ziemann D Office of Nuclear Reactor Regulation
To:	Mayer L NORTHERN STATES POWER CO.
References
NUDOCS 9211180423
Download: ML20127H179 (3)

Text

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OE Docket No. 50-263 p

BBuckley RMDiggs Northern states Power Company

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Amt k. L. O. byer TBAbernathy, DTIE 1

Director of Nuclear Shrga Support Services ACRS (%)

414 Nicollet Mall q

Minneapolia, Minnesota 55401 Gentlemen The Regulatory staff has coupleted its initial review of the structural aspects of your report, " Preliminary Report of Fuel Cask Drop Accident," dated 4ctober 1,1974. We find that additional information is required for the staff to complete

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its structural evaluation. The additional information requested is enclosed.

i Pisase inform us within ten (10) days af ter receipt of this 4

i letter of your planned schedule for submitting the response.

If you have any questions regarding the request or if you '

would like to schedule a meetina with the staff to discuss this matter, pleasa sagletett%1!?s OT* Bagtgppkgy;.;oy, l

Sincerely, i

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Origitrd m,ced by

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Der.nis L.Zicmaan Dennis L. Ziemann, Chief Operating Reactors Branch f2 i

Division of Reactor Licensing Enclosuret I

Additional Information l

Request

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Arthur Renquist, Esquire The Environmental Conservation Vice President Law Library Northern States Power Comp'any

. Minneapolis Public Library 414 Nicollet Mall 300 Nicollet Mall Kinneapolis, Minnesota 55401 Minneapolis, Minnesota 55401 Gerald Charnoff Shaw, Pittman, Pott's, Trowbridge and Madden 910 - 17th Street, N. W.

Washington, D. C.

20036 Howard J. Vogel, Esquire Legal Counsel 2750 Dean Parkway Minneapolis, Minnesota 55416 Steve Gadler, P.

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2120 Carter Avenue

'St. Paul, Minnesota 55108 Mr. Daniel L. Ficker Assistant City Attorney 638 City Hall

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St. Paul, Minnesota 55102 i

l Ken Dzugan, Director-City of St. Paul Follution I

Control Services 100 East 10th Street St.-Paul, Minnesota 55108 Sandra S. Gardebring

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l-Special Assistant Attorney General Counsel for Minnesota Pollution Control Agency i

1935-W. County Road B2.

Roseville, Minnesota 55113-Anth.ony - Z. Roisman, Esquire.

l-i Berlin,: Roisman and Kessler -

-i 1712 N Street, N. W.

~ Washington D. C.

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m i-4 REQUEST FOR ADDITIONAL INFORMATION j

NORTHERN STATES POWER COMPANY MONTICELLO NUCLEAR GENERATING PLANT DOCKET NO. 50-263 l

The information provided in your report, " Preliminary Report of Fuel 4

Cask Drop Accident Analysis," dated October 1,1974, is not sufficient i

to permit an evaluation of the safety margin provided in the design and i

construction of the spent fuel pool and other critical structural elements for loads generated by a cask drop when combined with other design-loads.

It is requested that you provide additional information to demonstrate i

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that when the loads due to a cask drop are considered together with other j

design loads, the safety margins for the spent fuel pool, floor slabs,

'l beams. and protective structures for Category I equipment are similar to the safety margins established in Document (B), " Structural Design Criteria i

for Category I Structures Outside the Containment." Document (B) was orignially written for structures outside of the containment but is also l

applicable to the structures inside the containment. Therefore, provide i

i a statement that when cask drop loads are included in the analysis the i

j design criteria and the design methods for the spent fuel pool, and other l

essential structural systems satisfy the requirements of Document (B) cited above..

A' copy of Document (B) is attached for your convenience.

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