ML20217A956

Forwards Request for Addl Info Re Station Blackout/ Electrical Safeguards Upgrade Project

ML20217A956
Person / Time
Site:	Prairie Island
Issue date:	03/01/1991
From:	Masciantonio A Office of Nuclear Reactor Regulation
To:	Parker T NORTHERN STATES POWER CO.
References
TAC-68588, TAC-68589, NUDOCS 9103070140
Download: ML20217A956 (4)

Text

March 1, 1991 e

Docket Nos. 50-282 and 50-306 Mr. T. M. Parker, Manager Nuclear Support Services Northern States Power Company 414 Nicollet Mall Minneapolis, Minnesota 55401

SUBJECT:

REQUEST FOR ADDITIONAL INFORMATION STATION BLACKOUT / ELECTRICAL SAFEGUARDS UPGRADE PROJECT (TAC NOS. 63588/68589)

The NRC staf f has reviewed the structural eng'neering aspects of your November 27, 1990 submittal, " Design Report for the Station Blackout / Electrical Safeguards Upgrade Project." We find that additional information is required before we can complete our evaluation as detailed in the enclosure.

Please provide a response to these questions within 45 days to that we can maintain our review schedule.

Sincerely,

/s Armando Masciantonio, Project Manager Project Directorate 111-1 Division of Reactor Projects III/IV/V Of fice of Nuclear Reactor Regulation -

Enclosure:

As stated cc: See next page DISTRIBUTION ,-

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• t, / March 1, 1991

.....f Docket Nos. 50-282 and 50-306 Mr. T. M. Parker, Manager Nuclear Support Services Northern States Power Company 414 Nicollet Mall Minneapolis, Minnesota 55401 Dea

• Mr. Parker:

SUBJECT:

REQUEST FOR ADDITIONAL INFORMATION - STATION BLACKOUT / ELECTRICAL SAFEGUARDS UPGRADE PROJECT (TAC NOS. 68588/68589)

The NRC staff has reviewed the structural engineering aspects of your November 27, 1990 submittal, " Design Report for the Station Blackout / Electrical Safeguards upgrade Project." We find that additional information is required before we can complete our evaluation as detailed in the enclosure. Please provide a response to these questions within 45 days so that we can maintain our review schedule.

Sincerely,

/:C %~fm Armando Masciantonio, Project Manager Project Directorate 111-1 Division of Reactor Projects III/IV/V Office of Nuclear Reactor Regulation

Enclosure:

As stated cc: See next page 1

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z. -Mr.-T. M. Parker .

Prairie Island Nuclear Generating

- Northern States Power Company . Plant

-cc:

Gerald Charnoff, Esq.  ;

Shaw, Pittman, Potts -and .Trowbridge .'

2300 N Street, N.W.

Washington, DC 20037 Dr. . J. W. Ferman 2 Minnesota Pollution Control Agency 520 Lafayette Road St. Paul, MN 55155 Mr. E. L. Watz1, Plant Manager Prairie Island Nuclear Generating Plant Northern States Power Company

Route 2 Welch, Minnesota 55089 Joseph = G. Maternowski Assistant Attorney General-Environmental Protection Division Suite.200 520 Lafayette Road -

St. Paul,-Minnesota 55155' U.S. Nuclear Regulatory Commission Resident inspector's Office-1719 Wakonade Drive East -

Welch, Minnesota 55089.

Regional Administrator . Region III L

U. S .1 Nu cl ea r. R egu l a to ry Commi s si on Office of Executive Director for Operations '

v 1799 Roosevelt Road Glen Ellyn, Illinois 60137 l

-Mr. William Miller.. Auditor Goodhue County Courthouse Red Wing, Minnesota 55066 l

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REQUEST FOR ADDITIONAL INFORMATION ON STATION BLACK 0UT/ ELECTRICAL SAFEGUARDS UPCRADE PROJECT TPAIRIE ISLAND UNITS 1 AND 2 STRUCTURAL AND GEOSCIENCES DRANCH

1. Is the new D5/D6 building independent from its exist neighboring buildings? Is its foundation isolated from the existing foundations? Is the building structure connected in any way with the old structures? If so, what is mininium clearance between two buildings and why?

2. Provide the design ground motion for the seismic design of the new 05/06 building. This includes horizontal and vertical response spectra for both OBE and SSE at the foundation level.

3. Provide information in regards to the roof design relative to the drainage of rain water. Are there parapets or curbs built arouno the roof that would cau',e water ponding in case of probable maximum precipitation (PMp)? Has the problen of PHP as stated in NRC Generic Letter 8042 been considered? Are the roof slabs designed to support the weig h of the_ponded water?