ML20129F958

Forwards Request for Addl Info Re High Density Spent Fuel Racks in Upper Containment Pool & in Spent Fuel Storage Pool.Response Due by 850715

ML20129F958
Person / Time
Site:	Grand Gulf
Issue date:	07/05/1985
From:	Adensam E Office of Nuclear Reactor Regulation
To:	Richard J MISSISSIPPI POWER & LIGHT CO.
References
TAC-57619, NUDOCS 8507170498
Download: ML20129F958 (5)

Text

JGL 5 1985 Docket No.' 50-416 DISTRIBUTION:

Docket.Eile 50-416, NRC PDR Local PDR Mr. Jackson B. Richard PRC System Senior Vice President, Nuclear NSIC Mississippi Power and Light Company LB #4 r/f ACRS (16)

Post Office Box 23054 MDuncan JPartlow Jackson, Mississippi 39205 DHood BGrimes OELD, Attorney EJordan

SUBJECT:

GRAND GULF NUCLEAR STATION UNIT 1-HIGH DENSITY SPENT FUEL RACKS

Dear Mr. Richard:

The NRC staff is reviewing the Mississippi Power and Light Company submittal dated May 6, 1985 which requests an amendment to Grand Gulf Unit i license to allow installation of high density spent fuel racks in the upper containment pool and in the spent fuel storage pool. The staff finds that the additional information described in the enclosure is needed to complete the review.

In order to meet the schedule for completion of this review, you are requested to provide the information described in the enclosure by July 15, 1985.

Provide one copy directly to our consultant:

R. C. Herrick Franklin Research Center 20th and Pace Street Philadelphia, Pa 19103 The reporting and/or recordkeeping requirements contained in this letter affect fewer than ten respondents; therefore, OMB clearance is not required under P.L.96-511.

Sincerely, f p J c~

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/ E inor densam, Chief f

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. sing Branch No. 4 Division of Licensing Enclosure Kalf /

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8507170498 850705 PDR ADOCK 05000416 p

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GRAND GULF Mr. Jackson B. Richard Senior Vice President, Nuclear Mississippi Power & Light Company P.O. Box 23054 Jackson, Mississippi 39205 cc: Robert B. McGehee, Esquire The Honorable William J. Guste, Jr.

Wise, Carter, Child, Steen and Caraway Attorney General P.O. Box 651 Department of Justice

.lackson, Mississippi 39205 State of Louisiana Baton Rouge, Louisiana 70804 Nicholas S. Reynolds, Esquire Bishop, Liberman, Cook, Purcell Mr. Oliver D. Kingsley, Jr.

and Reynolds Vice President, Nuclear Operations I?00 17th Street, N.W.

Mississippi Power & Light Company Washington, D. C.

20036 P.O. Box 23054 Jackson, Mississippi 39705 Mr. Ralph T. Lally Manager of Quality Assurance Middle South Services, Inc.

P.O. Box 61000 New Orleans, Louisiana 70161 Mr. Larry F. Dale, Director Nuclear Licensing and Safety Mississippi Power & Light Company P.O. Box 23054 Jackson, Mississippi 39205 Mr. R. W. Jackson, Proiect Engineer Bechtel Power Corporation 15740 Shady Grove Road Gaithersburg, Maryland 20760 Mr. Ross C. Butcher Senior Resident Inspector U.S. Nuclear Regulatory Commission Route 2, Box 399 Port Gibson, Mississippi 39150 J. Nelson Grace, Regional Administrator U.S. Nuclear Regulatory Commission, Region II 101 Marietta Street, N.W., Suite 2900 Atlanta, Georgia 303?3 Mr. J. E. Cross, General Manager Grand Gulf Nuclear Station Mississippi Power & Light Company P.O. Box 756 Port Gibson, Mississippi 39150

ENCLOSURE 1 MISSISSIPPI POWER & LIGHT COMPANY GRAND GULF NUCLEAR STATION, UNIT 1 Request for Additional Information Regarding the Proposed High Density Spent Fuel Rack Installation [1]

A.

SPENT FUEL RACK SEISMIC ANALYSIS 1.

With respect to the numerical solution of the dynamic analysis, please provide the following:

a.

Proof of satisfactory convergence and stability of the numerical solution of the equations.

b.

The integration time step used, and its relationship to that integration time step forming the boundary of stable solutions.

2.

Contrary to the discussion of computed results in Section 6.6 [1], the dimensions shown in Figures 2.1 and 2.2 indicate that no gap exists between the walls and the proposed fuel racks that are placed adjacent to the walls. Please provide a full description of the space between adjacent racks and between the racks and the walls.

3.

Figures 2.1 and 2.2 of the Grand Gulf Licensing Report [1] indicate that fuel racks of various dimensions and geometric orientations are placed adjacent to each other. Also, racks of the same dimensions and geometric proportions may be loaded with a differer.t number of spent fuel assemblies to cause a variation in the mass from rack to rack.

Therefore, high probability exists for adjacent racks to have dynamic out-of-phase motion with each other, effectively reducing the gap per rack module to half the value shown and discussed in the licensing report. This consideration would affect the fluid coupling parameters used in the dynamic analysis as well as the gap width to which displacements are compared. Please provide response data indicating that the rack modules do not impact under this out-of-phase motion condition.

4.

While the licensing report [1] provides technical descriptions of the non-linear dynamic displacement analysis and the basis of the stress analysis methods, the rationale for transfer of the non-linear dynamics results for use by the subsequent linear stress analysis was not described. Please provide the technical basis for this operation as well as any checks employed to assure its validity in this application.

B.

DROPPED FUEL ACCIDENT I 1.

Please be more precise as to the total drop height associated with the statement " dropped from 36 inches above a storage location" as stated in Section 7.1 of the Licensing Report [1].

, C.

LINER INTEGRITY ANALYSIS 1.

For liner stress under the worst rack foot loading, it is not clear from the discussion on pages 7-3 and 7-6 of the Licensing Report [1]

that the " max liner direct stress" is a tensile stress and how it was calculated. Please supply more detail.

D.

SPENT FUEL POOL DYNAMIC ANALYSIS 1.

Please identify all masses considered to be acting with the spent fuel pool floor in the modal analysis and the dynamic analysis. Please explain why these masses are included and why other masses associated with the spent fuel pool should be excluded.

Reference 1.

Mississippi Power and Light Company, Licensing Report on High Density Spent Fuel Racks, Grand Gulf Nuclear Station, Unit 1, report submitted as to letter from Mississippi Power and Light Company (0. D.

Kingsley) to the NRC (H. R. Denton), dated May 6,1985.

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Docket No. 50-416 DISTRIBUTION:

Docket File 50-416 NRC PDR Local PDR Mr. Jackson B. Richard PRC System Senior Vice President, Nuclear NSIC Mississippi Power and Light Compary LB #4 r/f ACRS (16)

Post Office Box 23054 MDuncan JPartlow Jackson, Mississippi 39205 DHood BGrimes OELD, Attorney EJordan

SUBJECT:

GRAND GULF NUCLEAR STATION UNIT 1-HIGH DENSITY SPENT FUEL RACKS

Dear Mr. Richard:

The NRC staff is reviewing the Mississippi Power and Light Company submittal dated May 6,1985 which requests an amendment to Grand Gulf Unit I license to allow installation of high density spent fuel racks in the upper containment pool and in the spent fuel storage pool. The staff finds that the additional information described in the enclosure is needed to complete the review.

In order to meet the schedule for completion of this review, you are requested to provide the information described in the enclosure by July 10, 1985.

Provide one copy directly to our consultant:

R. C. Herrfck Franklin Research Center 20th and Pace Street Philadelphia, Pa 19103 The reporting and/or recordkeeping requirements contained in this letter affect fewer than ten respondents; therefore, OMB clearance is not required under P.L.96-511.

Sincerely, Elinor G. Adensam, Chief Licensing Branch No. 4 Division of Licensing Enclosure DL:LB#4 LA:DL:LB #4 C:DL:LB#4 LKintner:cl MDuncan EAdensam 7 / J/85

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