ML19323F389
| ML19323F389 | |
| Person / Time | |
|---|---|
| Site: | 07109133 |
| Issue date: | 09/14/1979 |
| From: | Richardson H GAMMA INDUSTRIES, INC. |
| To: | Macdonald C NRC OFFICE OF NUCLEAR MATERIAL SAFETY & SAFEGUARDS (NMSS) |
| Shared Package | |
| ML19323F385 | List: |
| References | |
| 16223, NUDOCS 8005280925 | |
| Download: ML19323F389 (3) | |
Text
A DIVtSION OF
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September 14, 1979 Mr. Charles E. MacDonald, Chief Transportation Certification Branch Division of Fuel Cycle and Material Safety, NMSS U.
S.
Nuclear Regulatory Commission Washington, D.
C.
20555
Dear Mr. MacDonald:
Please refer to your letter dated September 11, 1979, reference FCTC:JEJ, 71-9133.
Enclosed are items to be inserted into the Application for NRC Certificate of Compliance on " CENTURY" model devices manufactured by Gamma Industries.
1.
Page 7.7A which provides information related to item 1 on Enclosure to letter dated September 11, 1979.
2.
Bills of material which provide information related to item 2 on Enclosure to letter dated September 11, 1979.
I hope this will satisfy your requirement of advising you within thirty (30) days from the date of your letter dated September 11, 1979.
Sincerely, s,
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'vt Harry Richardson President GAMMA INDUSTRIES l
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Enclosures
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PROGRESS THROUGH INNOVATION scosase/ry
'Ir 7.7A Additional information requested by Mr. Charles E. MacDonald on September 11, 1979 -
1.
Provide justification that the hypothetical accident 30-foot drop and puncture tests were performed such that maximum damage to the lock-box assembly was sustained.
INTRODUCTION Large numbers of these devices have been used [or many In accident conditions on highways and construction years.
projects these " Century" models have been run over by trucks and tractors, dropped onto concrete slabs from heights ap-proaching 100 feet, dropped into ocean depths from pipeline barges, et al with no breaches of shielding integrity being reported to Gamma Industries.
Devices with similar construc-tion are being used at ocean depths exceeding 1,000 feet. It is belin. 2d that the stresses imposed in these situat. ions is greater than those stresses imposed by the drop test and puncture test.
The rationale for selecting impact conditions for imposing maximum damage to shielding integrity follows:
a.
Drop Test from 30 feet The device was suspended and dropped with an attitude that the lockbox safety cap would be the initial im-pact point with the device center of gravity verti-cally above the impact point.
It is believed this would cause maximum stress upon the lockbox and the bolts which secure the lockbox to the steel housing.
Any other attitude wou]d result in generating a mo-ment causing rotation about the impact point, thereby decreasing the stresses upon the lockbox, bolts, and the housing.
b.
Puncture First, it is inconceivable that the drop from 40 inches upon a 6 inch diameter steel bar could cause any damage to a device like the " Century".
Second, in attempting to determine which impact point would be likely to inflict the most damage, it was believed appropriate to select a drop from 40 i,nches W'
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with a direction and attitude which would cause'-
maximum stress on the lockbox " flanges" and the-bolts.
The drop was made in such a manner that the initial impact point upon the steel bar was near the outer end of the lockbox.
This would provide the maximum bending moment upon the lockbox and also provide shear stresses upon the' bolts.
No adverse.results to shielding integrity were ob-e served after these tests were completed.
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