ML19339B855
| ML19339B855 | |
| Person / Time | |
|---|---|
| Site: | 07105086 |
| Issue date: | 09/25/1980 |
| From: | Kirk W UNITED NUCLEAR CORP., UNITED NUCLEAR CORP. (SUBS. OF UNC, INC.) |
| To: | Macdonald C NRC OFFICE OF NUCLEAR MATERIAL SAFETY & SAFEGUARDS (NMSS) |
| References | |
| 17520, NIS-80-9-54, NUDOCS 8011100294 | |
| Download: ML19339B855 (1) | |
Text
o UnC nRVAL PRODUCTS fo gg D v s:On of Unded Nuclear Corporaton 67 Sande Desert Road Te'ephone 203/848-1511 A unC RESOURCES Cornpany Uncasydle. Connecbcut 06382 j
O Elj In reply, please refer to: NIS-80-9-54 September 25, 1980 Mr. Charles E. MacDonald, Chief Transportation Certification Branch
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Division of Fuel Cycle & Material Safety z,
U. S. Nuclear Regulatory Commission Washington, D. C. 20555 DCCKEnD 'h USNRC
Subject:
Use Of The Term " Drop Forged Lugs" In t-OCT 2 2 G20 's Reference To Container Closure Rings-j
- All SECTION
,/
Reference:
49 CFR 178.103-5 (6L) 4 DOCKET ClutX,. 'r 49 CFR 178.104-4 (6M) 49 CFR 178.118-8 (17H) b'
Dear Sir:
During the recent renewal of Certificate of Compliance No. USA /5086/AF, the addition of the condition " drop forged lugs" was made.
I believe this term goes back to the period in which the closure ring was a circular rod, in which one or both ends were forged into lug (s). If only one end was forged, the other end was threaded and slipped into a drilled hole in the forged lug, which then had a nut put on.
If both ends were forged, then a separate bolt was used.
However, with the availability of generally reliable welding and a desire to lighten the shipping container, a combination ring of roll-formed sheet with welded lugs was developed.
The specification of " drop forged lugs" is unnecessary when the bolt and ring are low carbon steel, and the attachment veld of the lug to ring is only " good workmanship". The lug could be fabricated by any commercial means (e.g., cut from rolled plate, cast or forged) as long as it was low carbon steel.
It has been our experience that the general mode of failure is the weld.
It is requested that the unnecessary term " drop forged lug" be discontinued in all NRC-DOT shipping container terminology.
Very truly yours V
4 M
W. F. Kirk, Manager f
Nuclear & Industrial Safety h
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