ML19263C281

Notifies NRC of Mod to Design Analysis to Include an Extreme Environ Live Load for Snow of 50 Psf

ML19263C281
Person / Time
Site:	Skagit
Issue date:	02/05/1979
From:	Mecca J PUGET SOUND POWER & LIGHT CO.
To:	Stolz J Office of Nuclear Reactor Regulation
References
NUDOCS 7902130186
Download: ML19263C281 (2)

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February 5, 1979 PLN-212 Director of Nuclear Reactor Regulation Attention: Mr. John F. Stolz, Chief Light Water Reactor Branch No. 1 Division of Project Management U. S. Nuclear Regulatory Commission Washington D. C. 20555

Subject:

Puget Sound Power & Light Company Skagit Nuclear Power Project, Units 1 & 2 Docket Numbers 50-522 and 50-523 Category 1 Structure Roof Snowfall Loading Centlemen:

The purpose of this letter is to notify the Nuclear Regulatory Commission of a modification to our design analysis on this subject to include an extreme environmental live load for snow of 50 psf. The following load combinations, therefore, are considered in addition to those delineated in the SNPP PSAR, Sections 3.8.6.2.2 and 3.8.6.3.2.a., respectively.

For concrete structures:

U=D+L+To+Rg+ SL For steel structures:

1.5S = D + L + T +R + SL o o where SL = 50 psf, an extreme environmenta.1 line load for snowfall It is noted for your information that the structural live load, as defined in PSAR Seteion 3.8.6.1.1 as a normal load, remains unchanged and includes snow and ice loads as presented in PSAR Section 2.4.2.3. Although t is not present-ly contemplated that the PSAR will be amended to include this information, the Final Safety Analysis Report will reflect the se modifications eo the design analysis as defined above.

If you desire further information on this =atter, please contact che under-signed.

Very truly yours,

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J. E. Mecca, Manager Nuclear Licensing & Safety cc: Correspondence List 790213018G 3e t L sIE" i

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January 12, 1979 a

CORRESPONDENCE LIST Mr. Richard L. Black CFSP and FOB NRC Legal Staff c/o E. Stachon & L. Marbet U. S. Nuclear Regulatory Commission 19142 South Bakers Ferry Road Office of the Executive Legal Director Boring,' Oregon 97099 Washington, D. C. 20555 Mr. Roger M. Leed, Esq. Mr. Richard M. Sandvik, Esq.

Suite 610 Assistant Attorney General 1411 Fourth Avenue Building State of Oregon Seattle, Washington 98101 Department of Justice 500 Pacific Building Mr. Nicholas D. Lewis, Chairman 520 S. W. Ya= hill Washington State Energy Facility Portland, Oregon 97204 Site Evaluation Council 820 East Fifth Avenue Mr. Richard D. Bach, Esq.

Olympia, Washington 98504 Rives, Bonyhadi & Drummond 1400 Public Service Building Mr. Robert C. Schofield, Director 920 S. W. 6th Avenue Skagit County Planning Department Portland, Oregon 97204 Room 218 County Administration Building Mr. H. 3. Phillips, Esq.

Mount Vernon, Washington 98273 Vice President and Corporate Counsel Portland General Electric Company Mr. Robert Lowenstein 121 S. W. Salmon Lowenstein, Newman, Reis, Axelrad & Toll Portland, Oregon 97204 1025 Connecticut Avenue N. W.

Suite 1214 Washington, D. C. 20036 Mr. F. T. Thomsen Perkins, Cole, Stone, Olsen & Williams 1900 Washington Building Seattle, Washington 98101