ML20043A036
| ML20043A036 | |
| Person / Time | |
|---|---|
| Site: | 07109218 |
| Issue date: | 05/09/1990 |
| From: | Easton E NRC OFFICE OF NUCLEAR MATERIAL SAFETY & SAFEGUARDS (NMSS) |
| To: | NRC OFFICE OF NUCLEAR MATERIAL SAFETY & SAFEGUARDS (NMSS) |
| References | |
| NUDOCS 9005170225 | |
| Download: ML20043A036 (2) | |
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-MAY:0 9 1990 =
- j SGTB:EPE 71-9218=
s MEMORANDUM FOR:
The Files FROM::
. Earl P. Easton,!SGTB, NMSS
SUBJECT:
Meeting on-TRUPACT-II Shipping Packagei p
May.1,-1990' I
Attendees j
HEQ
' Nuclear Packa'aina-Westi'1ghouse/WIPP j
E. Easton D. Dawson.
P. Gregory l J. Cook J.-Cruse M. Caviness-J. Jankovich Si-Porter C. Haney W. Mikesell~ (consultant) New Mexico EEG -
H. Lee J. Channell-C. Chappell Pacific Nuclear Systems lj R. Smith i
EG&G Idaho DQE Southwest Research and
)
G. Miller R. Yoshimura Information Center-D.'Hancock Introduction On May 1,
1990, Transportation Branch staff met' with Nuclear Packaging Inc.(NUPAC), Westinghouse, and the~ Department of Energy (DOE) to discuss issues related to the fabrication of Trupact II shipping containers.
Specific items discussed were the allowable e
tolerances in the thickness of the container walls, weld finish and fabricacion requirements for the transition regions where container wall thicknesses change.
Discussion The wall thickness in the dc.med lid of Trupact II containers y
fabricated to date is not uniform.
During fabrication the wall thickness was reduced by bending and forming and-weld grinding.
NUPAC proposed tolerances for allowable wall-thickness in the dome and knuckle region based on measurements of corresponding regions in the three certification test units.
The tolerances-proposed were based on the thinnest wall thicknesses measured for the three units.
NRC staff stated that the minimum wall thickness for these 4
areas should be consistent with the ASME Code.
The ASME Code allows a minimum thickness of 0.240 inches for nominal quarter-inch thick plate.
The Code specifies that-thicker plate should be used when thinning due to fabrication may occur.
The NRC staff agreed that a minimum wall thickness of 0.240 inches should be assured for 9005170225 900509
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r the dome and knuckle regions.
'NUPAC also discussed their. plans to submit
-an-application requesting that welds 'on the inner and outer-container surfaces not i
be ground; flush on' future production _ units.
-This would. be a'
i-precaution against removing -excess ' material from the welded-surfaces 'and reducing wall-thicknesses to below:'the minimum thicknesses. required.
NRC staff - stated: that.the welds on the exterior surface should be ground' smooth.- This should prevent the i
puncture bar from catching on an exterior weldment.. Welds on inner surfaces would not need to be ground flush-but should be' finished in accordance with ASME Code requirements.
NUPAC also dicussed plans.to. submit.an application which would
request a change in the_ length of the 3/8-inch thick region of the
- outer container for future production' units. 'The_3/8-inch thick-region was designed to' prevent. puncture.of the outer. container in a region where a subsequent fire test _ test could potentially cause-damage to the outer containment seal.
NRC~ staff. stated ~that the.
length of the 3/8-inch thick region of the outer container wall in production units should be equal in length to the 3/8-inch thick-1' region used for the certification test units.'
.j
& R EA Earl P.
Easton Project Manager SGTB, SGTR, NMSS DISTRIBUTION:
%NRC2f/c:df!Mtg. Notebook NMSS r/f NRC PDR SGTB r/f ATTENDEES CMacDonald CChappell JCook Nosgood JJankovich HLee CHaney
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