ML20214R488
| ML20214R488 | |
| Person / Time | |
|---|---|
| Site: | Vogtle  |
| Issue date: | 11/28/1986 |
| From: | Mark Miller Office of Nuclear Reactor Regulation |
| To: | Conway R GEORGIA POWER CO. |
| References | |
| NUDOCS 8612050481 | |
| Download: ML20214R488 (5) | |
Text
9 Docket Nos.: 50-424 and 50-425 NOV 2 81986 fir. Richard Conway, Senior Vice President and Project General f4anager Georgia Pcwer Company Rt. 2, Box 299A Daynesboro, GA 30830
Dear fir. Conway:
SUBJECT:
REQUEST FOR ADDITIONAL If1 FORMATION ON V0GTLE OPEN ITEM 16, "SPEt!T FUEL P00L RACK DESIGN" By FSAR A;endment 25, Georgia Power Company provided infonration on a revised spent fuel pool rack design in response to open item 16. The staff has re-viewed this amendment and requires additional information to complete its review concerning the structural adequacy (enclosed).
Because the spent fuel pool racks will not be necessary at time of licensing, the Vogtle Unit 1 license will be conditioned to require staff approval of the spent fuel pool racks design prior to their use.
Sincerely, is\\
Melanie A. Miller, Project Manager PWR Project Directorate #4 Division of PWR Licensing-A
Enclosure:
As stated cc:
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NOV 2 81986 Docket f:cs.: 50-424 i
and 50-425 Mr. Richard Conway, Senior Vice President and Project General Manager Georgia Power Con;pany Rt. 2, Box 299A Waynesboro, GA 30830
Dear Mr. Conway:
SUBJECT:
REQUEST FOR ADDITIONAL INFORMATION Ofi VCGTLE OPEN ITEM 16, " SPENT FUEL POOL RACK DESIGl:"
By FSAR Amendment 25, Georgia Power Company provided infonr,ation on a revised spent fuel pool rack design in response to open item 16. The staff has re-viewed this amendirent and requires additional infonnation to complete its review concerning the structural adequacy (enclosed).
Because the spent fuel pool racks will not be necessary at time of licensing, the Vogtle Unit I license will be conditioned to require staff approval of the spent fuel pool racks design prior to their use.
Sincerely, h
. ///
Melanie A. Miller, Project Parager PWR Project Directorate #4 Division of PWR Licensing-A
Enclosure:
As stated cc:
See next page
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g-Enclosure Vogtle Electric Generating Plant, Units 1 and 2 li Open item 16, Spent Fuel Pool Rack Design (F9 P Section 9.1.2.2.1)
Request for Additional Information 1.
Provide a detailed mathematical model of spenY fuel rack modules for seismic analysis.
The niocel should include clear norencleture for dimensions, weight, spring constants, daroping values, types of supports and restraints, applied forces, boundary conditions arc' ctber pertinent parameters.
2.
Provide a general description of method of nonlinear dynamic analysis used in the design of spent fuel racks. Address all basic assumptions of input motion, structural behavior, vibration theories, formulation of equations of motion, stress and displacement analyses.
3.
In Section 9.1.2.1 of the FSAR it is stated thct the spent fuel rack modules are free-standing, neither anchored to the bottom of the floor nor braced to the wall.
However, in Paragraph B of Section 9.1.2.2.1, deflections of racks were mentioned.
Explain how the free-standing racks avoid touching e6th other or the pool walls and how tFe seismic and imoact loads are applied in the rack evaluation.
4.
Provide the input motion, in the form of response spectra or time history, at the spent fuel pool floor.
Provide also the motion at the spent fue!
pool wall if it is significantly different from that at the floor.
5.
Provide sample calculations of the seismic and stress erelysis of the spent fuel rack modules considering various conditions of full, partially filled and empty fuel asser,tly loadings for the wet and dry perl ecses.
Sarcole calculations should also derronstrate how the time-history analysis is perfonced on a nonlinear neodel with the effective properties of er averece cell within the rack module.
~
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Discuss in detail the hydrodynemic ccupling of the cell with the fuel assembly. Provide physical properties of the fictitious springs anc dampers in the gaps betreen the fuel and the cell. How does this assur.iption agree hith experimental results?
7.
Describe the frictional forces that exist between rack support pads ard the pool floor and provide the basis for the friction coefficients tsed ir the analysis.
8.
Provide a sunmary of maximum calculated stresses for critical structural elements of typical spent fuel pool racks and show that these stresses are within allowable limits.
9.
FSAR Table 9.1.?-1 deviates from Appendix D to SRP Section 3.8.4 (Rev. 1) in the acceptance limit for certain load combinations.
Previde the basis and justification for such deviation.
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_k Mr. R. E. Conway Georgia Power Company Vogtle Electric Generating Plant i
CC*
Mr. L. T. Gucwa Resident Inspector Chief Nuclear Engineer Nuclear Regulatory Consnission Georgia Power Company P. O. Box 572 P.O. Box 4545 Waynesboro, Georgia 30830 Atlanta, Georgia 30302 Mr. Ruble A. Thomas Deppish Kirkland, III, Counsel Vice President - Licensing Vogtle Project Office of the Consumers' Utility Council Georgia Power Company /
Suite 225 Southern Company Services, Inc.
32 Peachtree Street, N.W.
P.O. Box 2625 Atlanta, Georgia 30303 Binningham, Alabama 35202 James E. Joiner Mr. Donald 0. Foster Vice President & Project General Manager Troutman, Sanders, Lockennan,
& Ashmore Georgia Power Company Candler Building Post Office Box 299A, Route 2 127 Peachtree Street, N.E.
Waynesboro, Georgia 30830 Atlanta, Georgia 30303 Danny Feig Mr. J. A. Bailey 1130 Alta Avenue Project Licensing Manager Atlar.ta, Georgia 30307 Southern Company Services. Inc.
P.O. Box 2625 Carol Stangler Birmingham, Alabama 35202 Georgians Against Nuclear Energy 425 Euclid Terrace Ernest L. Blake, Jr.
Atlanta, Georgia 30307 Bruce W. Churchill, Esq.
Shaw, Pittman, Potts and Trowbridge 2300 N Street, N.W.
Washington, D. C.
20037 Mr. G. Bockhold, Jr.
Vogtle Plant Manager Georgia Power Company Route 2, Box 299-A Waynesboro, Georgia 30830 Regional Administrator, Region II U.S. Nuclear Regulatory Commission 101 Marietta Street, N.W., Suite 2900 Atlanta, Georgia 30323
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