ML19340D279
| ML19340D279 | |
| Person / Time | |
|---|---|
| Site: | 07106744 |
| Issue date: | 11/11/1980 |
| From: | Osmeyer W TELEDYNE ENERGY SYSTEMS |
| To: | Macdonald C NRC OFFICE OF NUCLEAR MATERIAL SAFETY & SAFEGUARDS (NMSS) |
| References | |
| 17902, PPD-WEO-317, NUDOCS 8012290613 | |
| Download: ML19340D279 (4) | |
Text
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ENERGY SYS EMS 110 W. llMONIUM FID.
l llMONIUM, M D. 21093 i
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PHONC: 3M 7574220 Ttttx:omeo November 11, 1980 CABLt:itLISES Reier to:
PPD-WEO-317 O
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Vb 34 Mr. Charles MacDonald, Chief i
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Transportation Certification Branch L,ii CG Division of Fuel Cycle and Material Safety w
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U.S.'Huclear Regulatory Commission Washington, DC 20555
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Dear Mr. MacDonald:
j I have reviewed our applications for rencual of the Certiticate of Compliance, Dochet No. 71-6744 and find that sone of the information we sent to you was not applicable, specifically i
drawing revision J on the 32216 series of drawings.
It was our misunderstand.ing of the fabrication status for the Shielded Casks referenced by these drawings that led us to request approval at that revision level.
To the best of our knowledge, no cask was made to that weld configuration, specifically the right angle corners.
On the contrary, the latest casks which were fabricated-and sold to users were manufactured to the 109-55D0024 and,5 series which exhibit the rounded corners beneficial for impact
. strength.
As I mentioned in my earlier letter, the confusion arises from a transfer of the product from Protective Packaging, Inc. in Louisville, Kentucky to Teledyne Energy Systems in Timonium, Maryland.
l It is to the rounded corner design that we wish to qualify our
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amendment.
We were not aware that these casks were not covered-by the certification at the time of receiving the PPI product
/line and associated responsibilities.
As a result, the table of reference drawings in the Certificate should read:
Package Overpack Shielded Cask 1-6 No Changes 7-32340-1, Rev. D 109-55D0025, Rev. B 8
32340-2, Rev. D 109-55D0024, Rev. B In response to your request for information dated September 25, 1980 and subsequent conversations with Mr. John McGrew, the
- following is provided.
1.
Drauings 100-55D0024 and 5, Rev. B. reduced to a single sheet showing the details of construction of cask and lid assemblies for 1-1/2 and 4 inch thick. lead-casks.
The referenced condensed drawings are enclosed.
bec:
llall McGreu 8012290 3
O Osmeyer( w(2))
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PPD-WEO-317
- Page 2 2.
Revision J not applicable.
Your comments on design are correct.
(Ue don ' t know why PP1 ever issued this change; note the change was never dated.)
3.
Neoprene Seals:
An analysis of the seals by our structures engineer, Dr. Fred Schumann is enclosed for your review.
Finally, the original certification as it applies to the list of eleven users as of April 24, 19'/9 has not changed to the best of our knowledge.
The new design uns sold to Southern California Edison Company, San Onofre Facility, P.O.
Box 700, San Clemente, California 92672.
It was the San Onofre engineers that alerted us to the fact that PP1 didn't obtain a certificate for the newer casks, and as you know, as the present owner of the product line, we are obliged to obtain the certification renewal for them.
Thank you for your patience.
Please call me if there are any problems.
Very truly yours,
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v Willian E.
Osmeyer
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Product Mandger Telodyne Energy Systems WEO:SB 9
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, -.. o ATTACl! MENT Page 1 NEOPPINE SEAL EVALUATICN Shock Resistance", by Raymond Magner in Product Prom " Design for the acceleration forces during impact are dependent upon Engineering, shock rise time and of course the drop height such that, G = "72 /h t
where G = acceleration, g's, t = shock rise time, millisoc and
'h = drop height in inches.
h = 4(12) or 4S inches.
The shock rise For our particular application, time is a function of the clasticity of both the object and the target.
a short duration shock rise time and
'Jhc nore rigid materials provid 2 Shock rise times therefore a more significant acceleration results.
are determined by test where the impacting mass is instrumented with an accelerometer.
For. an example of rise times consider an object of steel impacting con-crete.
The shock rise time is one millisecond.
However, if the object impacts felt ( ~ 1" thick) the shock rise time is 20 milleseconds.
The lids for the filter casks are f abricated as a hollcw circular steel sliell of steel and filled with lead.
A typical cross-section is shown below.
OD = 26k-
- [MsTnEL PtATc (Tyr.)
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ft
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TK l
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GEAl-l t
The gasket or seal has a mean diameter of 21-3/4 inch with 1-1/4" width and 3/16" thickness.
The material is solid neoprene.
The weight of the lid is, 4
9
+ ;r (2 6) (1. 5) (. 2 5) (. 29) u U = 7(26. 25)"(. 25) (2) (. 29)
+ u (25.75) 2 (1. 5) (. 42) = 415.4 lbs.
3 4-The area of tihe gasket is, 85.41 in A = x (21. 75) (1. 2 5)
=
Therefore, for 1 g, the compressive stress in the gasket becomes, G
S
m 4
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ATTAClit2NT i
Page 2 P
415.4
= 4.86 ps1/g 1
=
a=A 83. n, l i
d, the chock rise l
' Assuming a four foot drop where the gasket is compresse time is taken as 10 milliseconds.
This value should be conservative based upon the low rigidity of the neoprene which acts as a rather sof t i
spring.
Therefore, from the previous equation,
- 49*9 9'"
i G=
0 The compressive stress in the gasket would be 49.4 ( 4. 86) or 242.5 psi.
~
(1.20 To demonstrate the. compressive capability of raoprene, a coupon i
was compressed in an Instron universal testing machine l
x 1.19 x 0. 24) to a stress level of 2591 psi
- or 10.7 times the derived environment.
l cracking or.any The results of the test indicated no permanent set,The test loading was a magni-
'other form of failure of the neoprene.
4 tude above the predicted stress icvel.
the number of g's anticipated is 2.74 times For a thirty foot drop, greater than for a four. foot drop.
Therefore, the expected stress level would be 2.74 (242.5) or 664.5 psi.
This value is also considerably below the compressive-capability of,the neoprene.
w i
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- Tent Dcta:
hrea = 1.428 in 1
3700 2bs.
t Load'(max)
=
b; 37'00
= 1. 4 2 8 = 2591 ps 1
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