ML20126K369

Forwards Revised Secondary Lid Analysis & Modified Procedures WM-014, Operating Instructions for Loading & Unloading NUS14-170 Series 1 Casks, WM-012, NUS14-170 Series 1 Maint & WM-011, Soap Bubble Leak Test Nus..

ML20126K369
Person / Time
Site:	07109151
Issue date:	05/07/1985
From:	Hipsher W NUS CORP.
To:	Macdonald C NRC OFFICE OF NUCLEAR MATERIAL SAFETY & SAFEGUARDS (NMSS)
Shared Package
ML20126K372	List: ML20126K369 ML20126K375 ML20126K381 ML20126K394
References
25221, NUDOCS 8506110005
Download: ML20126K369 (13)

Text

E W-9/5/

~n PROCESS SERVICES O CORPORATION May 7, 1985

[

ak Mr. Charles E.

MacDonald, Chief Transportation Certification Branch Division of Fuel Cycle & Material Safety, NMSS N

((M US Nuclear Regulatory Commission Washington, DC 20555 3

Re:

USNRC Letter dated March 11, 1985, c'o Docket Number 71-9151 ga

Dear Mr. MacDonald:

11 n.

This letter is in response to and transmits the information requested in the above referenced letter.

This letter and attachments are intended to supplement NUS Process Services' (NUSPSC) application dated December 7, 1984, as supplemented January 11, 1985 requesting amendment to the NUS14-170 Series 1 radioactive material shipping package.

In response to the requested information, NUSPSC has revised the Secondary Lid Analysis to include the same lid bolt strength and lid bolt torquing requirement that was used for the identical package lid design approved by Certificate of Compliance No.

9159.

Please find attached the revised Secondary Lid Analysis, Rev.

1, and modified procedures that support the maintenance and operations of the NUS14-170 cask (Certificate of Compliance No.

9151).

Should you have any additional questions, I shall be pleased to respond.

Sincer ly, W.

M.

Hipsher e

cgx Manager pk Transportation Servi e corvau YD b

WMil:pw wmc cc:

S.

McCoy - NUSPSC MAY 8 ESS > ]O

)

R. Voit - NUSPSC ess G. Antonucci - NUSED V AtL SECM

/

9 cocn1CLIRK

,//

Attachments:

Secondary Lid Analysis (8 copies) 4 p

Procedure WM-014, " Operating Instructions for Loading and Unloading the NUS14-170 Series 1 Package" (8 copies)

Procedure WM-012, "NUS14-170 Series 1 Maintenance" (8 copies)

Procedure WM-011, " Soap Bubble Leak Test NUSPSC Type A Shipping Cask" (8 copies)

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' tNUS NE M85 CORPORATION CLIENT NUS PSC FILE NO. 8916-CD-01. Rev. 1 BY F. Daneshaar SUBJECT NUS14-170 Sprins 1 Package Checked By H. Eckert SECONDARY LID ANALYSIS The purpose of this analysis is to provide the additional information requested by the USNRC in their letter of March 11, 1985.

The specific request is as follows:

The justification for incraasing the secondary lid from a 15.75-inch diameter to 28.75-inch diameter is primarily based on a comparison with the package designs approved by Certificate of Compliance No. 9159.

The comparison provided is not acceptable because differences in the lid bolt strength and lid bolt torquing requirements were not considered.

This could result in decreased safety margins. _In making a comparison, you should show that

_the safety margin for the applied method is at least equal

_to that approved. Alternatively, you may provide a detailed analysis of the adequacy of your closure design.

With respect to the bolt strength, the yield stress of the A-193 Grade

,BJ_ bolt material used in the NUS14-170 Series 1 Package is 105,000

)

psi.

This is the same bolt yield stress that was used in the package

[

designs approved by Certificate of Compliance No. 9159. Our calculations have been revised to reflect the minimum specified bolt yield stress of 105,000 psi.

Our Specification No. WM-014 " Operating Instructions for Loading and Unloading the NUS14-170 Series 1 Package" has been revised to specify i

a 100 ft..lb. lid bolt torquing requirement. This torque is the same j

as that specified for the package designs approved by Certificate of Compliance No. 9159.

With these two revisions to our calculations, and use of our impact deceleration of 26.0 g rather than the 33.9 g value used in the design approved by Certificate of Confonnance No. 9159, the safety margin is 1.03.

This margin is greater than the margin of 0.63 approved by l

Certificate of Compliance No. 9159.

This calculation therefore provides the additional justification as requested by the USNRC for increasing l

the size of the secondary lid.

l l

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