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CL ,is J-Mr. Harold R. Denton, DirecYo[#"'Office of Nuclear Reactor Regulation os

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/['.U. S. Nuclear Regulatory CommissionWashington, D. C. 20555 & DOCKETED

USNRC .,.

Attention: Mr. Robert L. Baer, Chief 2 Li

Light Water Reactors Branch 2 t AUG 141979 > _

MJAXK SECTICR Q

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Reference: McGuire Nuclear Station g gDocket No. 50-369, 50-370, 70-2623 -

.

Dear Mr. Denton:

Please find attached a spent fuel cask drop analysis for McGuire Nuclear Stationusing an NLI 1/2 cask. Based on the results of this analysis, it is requested

that approval be granted for use of an NLI 1/2 cask at McGuire Nuclear Station.

The Office of Nuclear Material Safety,and Safeguards is also being provided acopy of this letter and attachments since the subject matter is pertinent tothe pending amendment request presently being considered on Docket No. 70-2623.

Very trtiv- yours,-

$/ $ ,c.

William O. Parker, Jr. /g nh,

LJ3:sesAttach =ent

cc: Mr. William J. Dircks, DirectorOffice of Nuclear Material Safety

- and SafeguardsU. S. Nuclear Regulatory Coc=issionWashington, D. C. 20555 ppy

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McGuire Nuclear StationCask Drop Analysis

In order to allow an alternative to the use of the Duke Power Company NFS-4

cask for the shipment of spent fuel from Oconee Nuclear Station to McGuireNuclear, Station, we submit the following infornation concerning the use ofan NLI-1/2' cask. This analysis evaluaces the consequences of dropping or .-

Jipping, or a co=bination-of both, of the NLI-1/2. cask. in the McGuire spent .~ ~~4u.iI handling building 7 -~

The NLI-1/2 cask is a truck cask licensed by National Lead Company and is ModelNo. NLI-1/2. The cask weighs approximately 25 tons and is 200 inches long in-cluding top and bottom energy absorbers. The area in which the cask is handledis designed for a 30 foot drop of a proposed 100 ton rail cask and the struc-ture is reinforced concrete with a rock foundation. Local damage to the con-crete will be negligible and no safety related equipment is located in the casktravel path. The following circumstances of dropping the cask were consideredto be most critical and the assumptions and conclusions are presented:

Case #1 - The cask handling crane is assumed to be traveling at its maximum* *speed of 50 fpm and hits the crane stops nearest the spent fuel pool. The *

crane stops, and the cask is assumed to continue traveling toward the spentfuel pool rotating about a line through the centerline of the crane drum.The cask continues to swing until the kinetic energy is completely convertedto potential energy (i.e. the cask raises up as it rotates about the cranedrum). At the instant the cask swings as close to the spent fuel pool as - - -

possible, the cable breaks and the cask falls. The conclusion is that thecask falls on the edge of the spent fuel pool wall and falls away from thespent fuel pool due to its center of gravity being behind the wall . SeeSketch #1 for an illustration of this case.

Case #2 - The cask handling crane is assumed to be traveling at its maximumspeed of 50 fpm and hits the crane stops nearest the spent fuel pool. Thecrane stops and the cable breaks at the same instant, therefore the cask doesnot swing but is moving at 50 fpm. The cask is assumed to be at its highestposition, which is approximately 4 feet off the floor. The distance the cask1 avels at 50 fpm in the time it takes for the cask to fall 4 feet is deter-nined. The cask will hit the spent fuel pool wall and tend to rotate aboutits edge on the wall. It is determined that the amount of kinetic energy isnot sufficient to cause the cask to fall into the spent fuel pool. See Sketch#2 for an illustration of this case.

Case #3 - The cask is assumed to be over the edge of the cask pit wall andthe cable breaks. The cask either drops on the edge of the wall or the caskis lowered on to the edge of the wall. Either case gives the same initialconditions because in the event of a drop the kinetic energy is assumed tobe absorbed by the cask's bottom energy absorber. Therefore, the cask'spotential _ energy will cause the cask to tip toward the spent fuel pool wall .Energy losses at impact with the spent fuel pool wall are conservatively con-sidered and the results of the analysis show that the remaining energy isnot sufficient to cause the cask to fall into the spent fuel pool . See Sketch#3 for an illustration of this case.

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McGuire Nuclear StationCask Drop Analysis, con't.

In order to provide additional assurance that the cask will not fall into thespent fuel pool, the path of the cask will be controlled by application ofadministrative control as shown on Sketch #4 By requiring the cask to followthis path, the circumstances of Case #3 canrot occur and any potential forthe cask falling into the spent fuel pool is negated.

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