AECM-85-0297, Forwards Correction to Table 1 of 850815 Final Response to NRC Question Re Dynamic Analysis of High Density Spent Fuel Racks Proposed for Installation at Facility

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Forwards Correction to Table 1 of 850815 Final Response to NRC Question Re Dynamic Analysis of High Density Spent Fuel Racks Proposed for Installation at Facility
ML20135G099
Person / Time
Site: Grand Gulf Entergy icon.png
Issue date: 09/11/1985
From: Dale L
MISSISSIPPI POWER & LIGHT CO.
To: Harold Denton
Office of Nuclear Reactor Regulation
References
AECM-85-0297, AECM-85-297, TAC-57619, NUDOCS 8509180154
Download: ML20135G099 (3)
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EulullallMI Helping Build Mississippi P. O. B O X 184 0, J A C K S O N, MIS SIS SIP PI 39215-1640 September 11, 1985 NUCLE AR LICEN$1NG & 5AFETY DEPARTMENT U. S. Nuclear Regulatory Commission Office of Nuclear Reactor Regulation Washington, D. C. 20555 Attention: Mr. Harold R. Denton, Director

Dear Mr. Denton:

SUBJECT:

Grand Gulf Nuclear Station Unit 1 Docket No. 50-416 License No. NPF-29 File: 0260/0840/L-860.0 High Density Spent Fuel Racks-Correction to Table 1 of AECM-85/0252 AECM-85/0297 By letter dated August 15, 1985 (AECM-85/0252), Mississippi Power & Light provided a final response to the NRC Structural Engineering Branch's question regarding the dynamic analysis of the high density spent fuel racks proposed for installation at Grand Gulf Unit 1. The purpose of this letter is to correct an inadvertent error in the August 15, 1985 submittal.

The correction is made in the attached response and is indicated by an asterisk in column 3 of Table 1. This information was discussed with the Grand Gulf NRC Project Manager during a recent teleconference. If you have any additional questions, please contact this office.

Yours truly, L. F. Dale Director MLC/JCC:bms Attachment cc: Mr. J. B. Richard (w/a)

Mr. O. D. Kingsley, Jr. (w/a)

Mr. R. B. McGehee (w/a)

Mr. N. S. Reynolds (w/a)

Mr. H. L. Thomas (w/o)

Mr. R. C. Butcher (w/a) h P \

J16AECM85091003 - 1 Member Middle South utilities System

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AECM-85/0297

-l Page 2 j Mr. James M.' Taylor, Director (w/a)

Office of Inspection & Enforcement U. S. Nuclear Regulatory Commission Washington, D. C. 20555 Dr. J. Nelson Grace, Regional Administrator -(w/a)

U. S. Nuclear Regulatory Commission Region II' 101 Marietta St., N. W., Suite 2900 Atlanta, Georgia 30323 d

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J16AECM85091003 --2

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Attschment to-AECM-85/0297

.A. -SPENT FUEL RACK SEISMIC ANALYSIS

[A.1 QUESTION 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.

A.1 ANSWER The integration time step used in all dynayic analyses in

. Grand Gulf Unit 1 fuel pools was 0.2 x 10 seconds. Table 1 shows the convergence study performed on G-rack (11 x 11 module).

-It is found that ge converged result is in reasonable accord with the 0.2 x 10 second solution.

Table 1 DISPLACEMENT CONVERGENCE STUDY Time Step, T Maximum Displacement Coincident Time ~

(sec) (inch) Instant (sec) 0.3 x 10 1.402 11.84

~4 0.2 x 10 1.27 11.31*

~

0.15 x 10 ' 1.29 8.66

~

0.1 x 10 ' 1.33 8.44 0.75 x,10 -5 1.33 8.43 J16ATTC85091001 - 1

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