ML20214H123

Forwards Request for Addl Info to Complete NRC Review of 860425 Submittal Re Spent Fuel Pool Expansion.Info Requested by 860815

ML20214H123
Person / Time
Site:	Vermont Yankee File:NorthStar Vermont Yankee icon.png
Issue date:	07/24/1986
From:	Rooney V Office of Nuclear Reactor Regulation
To:	Capstick R VERMONT YANKEE NUCLEAR POWER CORP.
References
NUDOCS 8607310018
Download: ML20214H123 (6)

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( i Docket No. 50-271 JUL 2 41986 Mr. R. W. Capstick Licensing Engineer Vermont Yankee Nuclear Power Corporation 1671 Worchester Road Framingham, Massassachusetts 01701

SUBJECT:

REQUEST FOR ADDITIONAL INFORMATION - SPENT FUEL P0OL EXPANSION Re: Vermont Yankee Nuclear Power Station We are reviewing your proposed spent fuel pool expansion submitted by letter dated April 25, 1986, and find that we need additional information to complete our review. We request that you provide responses to the enclosed request by August 15, 1986.

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.

Original signed bj Vernon L. Rooney, Project Manager BWR Project Directorate #2 Division of BWR Licensing

Enclosure:

As stated cc/ enclosure:

S:e next page Distribution:

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4 ENCLOSURE i

REQUEST FOR ADDITIONAL INFORMATION FOR VERMONT YANKEE

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RELATING TO HIGH DENSITY RACK - 5 PENT ' FUEL POOL EXPANSIGH DOCKET NO. 50-271

Reference:

" Vermont Yankee Spent Fuel Storage Rack Replacement Report" April, 1986.

1) There are three load combinations provided in the report; pages 20, 71 and 88. Please discuss why there exist variations among three combinations and state which one was used for the rack design . Currently, the staff review is based on 1979 NRC position paper together with ASME Section III, subsection NF, 1980 for stress limits. -

2) It appears that there are errors in stress limits associated with the load combination in page 72. Sy is not allowed for levels A and B stress limits. Please clarify. .

3) Definition of 5 (section strength) is not clear. Provide an example and a justification for using S as a stress limit. (page 72)

' 4) It is stated that "the nonlinear three-dimensional model adequately represent the effects of impacting, friction and hydrodynamic coupling" (p. 74). Provide mathematical expressions for each component and discuss how such expressions are coded into the computer program. Provide experimental evidence that such mathematical expression together with numerical solution employed in the program indeed represent physical behaviors.

5) Provide a stability analysis for the nonlinear equation that governs rack dynamic response (p. 75-76). One should demonstrate that small changos in input parameters do not result into large changes in resultant values such as sliding and uplift of the rack. Parameters one should consider are damping, friction or any other major input such as forces and forcing frequencies. Some examples of stability analysis are demonstrated in

, " Nonlinear Vibration" by J.J. Stoker, Interscience Publishers and "

Analysis of Numerical Methods" by Isaacson and Keller, John Wiley.

. e 88

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6) It is ' stated in the report (p. 90) that " Euler buckling load for one storage cell is 105.7k" Provide a calculation for the buckling load together with a schematic drawing of the mathematical model. Demonstrate that a dynamic effect of dropped fuel assembly is considered in'the buckling calculation.

7) In the report (p. 75), it is stated that "three conditions of fuel storage were analyzed; full, half full and empty. Consider a case where only two or three extreme outer cells are loaded while rest of the cells are empty. Demonstrate that the rack does not tip over considering the fact that the rack support pads are recessed from the outer edge of.the rack.

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l Mr. R. W. Capstick Vemont Yankee Nuclear Power Corporation Vermont Yankee Nuclear Power Station -

i cc:

Mr. J. G. Weigand W. P. Murphy, Vice President &

President & Chief Executive Officer Manager of Operations i Vermont Yankee Nuclear Power Corp. Vemont Yankee Nuclear Power Corp.

R. D. 5 Box 369 R. D. 5, Box 169 Ferry Road Ferry Road Brattleboro, Verrient 05301 Brattleboro, Vernont 05301 Mr. Donald Hunter, Vice President Mr. Gerald Tarrant Cc riissioner Vermont Yankee Nuclear Power Corp. Vermont Department of Public , Service

• 1671 Worcester Road 120 State Street Framingham, Massachusetts 01701 Montpelier, Yomont 05602 New England Coalition en Nuclear Pollution Hill and Dale Fam Public Service Board R. D. 2. Box 223 State of Vemont Putney, Vemont 05346 120 Stete Street Montpelier, Vermont 05602 Mr. Walter Zaluzny Chaiman, Beard of Selectnan Vemont Yankee Decommissionirg Post Of' ice Box 116 Alliance Vernon, Vemont 05345 Box 53 Montpelier, Verront 05602-0053 J. P. Pelletier, Plant Manager Yemont Yankee Nuclear Power Corp.

Post Office Box 157 Resident Inspector Vernon, Vermont 05354 U. S. Nuclear Regulatory Comission Post Office Box 176 Raymond N. McCandless Vernon, Verrent 05354 Vemont Division of Occupational i A Radiological Health Ver mnt Public Interest Administration Building Research Group, Inc.

10 Baldwin Street 43 State Street Montpelier, Vemont 05602 Montpelier, Vermont 05602 Honorable John J. Easton Thomas A. Murley

Attorney General Regional Adninistrator State of Vermont Recion I Office

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109 State Street U. S. Muclear Regulatory Corrission Montpelier, Vermont 05602 631 Park Avenue King of Prussia, Pennsylvania 19406 John A. P.itscher, Esquire Ropes & Gray 225 Franklin Street Boston, Massachusetts 02110 l

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