ML20043G147

Responds to Requesting Addl Info on Proposed Mod of Model 200,per 891212 Application for Amend to Certificate of Compliance 5971

ML20043G147
Person / Time
Site:	07105971
Issue date:	06/12/1990
From:	Cunningham G GENERAL ELECTRIC CO.
To:	Macdonald C NRC OFFICE OF NUCLEAR MATERIAL SAFETY & SAFEGUARDS (NMSS)
References
NUDOCS 9006190119
Download: ML20043G147 (7)

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June 12, 1990 C. E. MacDonald, Chief l

Transportation Branch Office.of Nuclear Material Safety & Safeguards U.S. Nuclear Regulatory Commission Washington, D.C.

20555

References:

1) Certificate of Compliance No. $971 Docket 5971.

2) Application for Amendment to Certificate of Compliance i

.No. 5971; December 12, 1989.

3) Letter, C. E. MacDonald to G. E. Cunningham; February 5,1990.

Dear Mr. MacDonald:

i This letter is in response to your request for additional information (Ref. 2) on a proposed modification of the Model 200 shipping container.

GE Certification Drawing 129D4758 has been revised to provide details of both l

options (direct threading and threaded insert) for the lid engagement with the cask body.

The revised drawing is enclosed.

i The standard material of the selected threaded insert is ASTM A583. Type 303 with a passivated finish. The selected insert, KNHL 1608, has an internal thread of 1 8 UNC, Class 3B and an external thread of.1 3/8+12 UNF, Class 2A, The length is 1.0 inch. The-threaded inserts are used to provide permanent metal threads in virtually any ferrous and non. ferrous material.

The pull out strength depends on the minimum shear engagement area of the thread and the minimum ultimate shear strength of the parent material.

GE Certification Drawing 129D4758 was revised to delete the words "or equivalent".

The insert can develop the full tensile strength of the closure bolt.

This is based on the fact that the pull out strength is limited by the parent metal, the cask flange material.

Pulbout Shear engagement area Minimum ultimate of the external thread x

shear strength of l

strength of insert or of the bolt flange material b

or P An x Su shear l

9006190119 900612 PDR ADOCK 07105971 g

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t C. E. MacDonald June 12, 1990 l

For the insert / flange combination to be an optional method for the bolt / flange combination, the ratio of the pull out strength, P, for the insert over that of the bolt must be equal to or greater than 1.0.

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R a 1.0 Pbolt / flange

^" bolt

• 8" shear flange Anina and, R k 1.0

"" bolt The shear area is given by:

anL, Ds,g [ 2n +.

(sain * " max}I An where n

_ Thread per inch L,

Length of engagement Ds Min. maj r diameter of external thread min En Max. pitch dianneter of internal thread For the insert 1 3/8-12 UNF 2A thread,-

I n - 12; L, - 1.00 in.; Ds,g - 1.3617 in.;(2) En,,, - 1.3291 in.52) 3.105 in.2; An P

and for the 1 8 UNC 3A, I2); En,,, - 0.9276(2) n - 8; L, - 1.125 in.; Ds,g - 0.9830 2.626 in.

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C.:E. MacDonald ~ June 12,1990 i

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bi CE Certification' Drawing 129D4756 was-revised to include the requested

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information on the bolts.

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' Sincerely,

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- Senior Licensing Engineer s

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