ML20215M492
| ML20215M492 | |
| Person / Time | |
|---|---|
| Issue date: | 04/24/1987 |
| From: | Odegaarden R NRC OFFICE OF NUCLEAR MATERIAL SAFETY & SAFEGUARDS (NMSS) |
| To: | NRC OFFICE OF NUCLEAR MATERIAL SAFETY & SAFEGUARDS (NMSS) |
| References | |
| NUDOCS 8705130271 | |
| Download: ML20215M492 (2) | |
Text
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APR 24 1987 gg,eten seHS MEMORANDUM FOR:
The Files FROM:
Richard H. Odegaarden, SGTB, NMSS EnmN TO A.Ma:Ea
SUBJECT:
FAMILIARIZATION WITH M-140 CASK DESIGN gg Attendees Naval Reactors Bettis Atomic NRC W. Engel J. R. Kosko R. H. Odegaarden R. Woodberry M. S. Hartley W. H. Lake V. A. Mortenson C. R. Marotta D. T. Huang C. E. MacDonald C. R. Chappell H. W. Lee E. P. Easton C. E. Williams Introduction A meeting (was held at the request of Department of Energy, Division of Naval Reactors NR) at Silver Spring, Maryland, on March 30, 1987, concerning the design of the Model No M-140 cask.
Discussion NR has designed a new model rail shipping cask to supplement the Model No.
M-130 casks. This new design (designated Model No, M-140) will be shown to meet the requirements of 10 CFR Part 71. The cask is about 16'9" outside length by 10'6" outside diameter. The cask is fabricated from a 304-SS forging with the lid held in place by retention wedges.
The cask will be provided with cooling fins.
There are three body and three lid penetrations.
All penetrations are scaled with two rubber 0-rings and are provided with leak test capabilities. Neutron shielding will be provided in the rail car.
A 1/4 scale model will be drop tested to verify the adequacy of the structural calculations. The internals will only be simulated in the model testing. The following scale drop tests are planned with at least two tests conducted at minus 20*F:
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Flat top end drop 2.
Flat bottom end drop 3.
Top ccrner drop 4.
Top corner drop with slapdown 5.
Side drop 6.
40" puncture drop Pecause the bottom corner is not protected with impact limiter materials, the NRC staff requested an additional bottom corner drop and NR agreed.
The following radiation dose rates are expected:
Normal Accident Surface 28 mrem /hr 6' from surface 6 mrem /hr 3' from surface 4300 mrem /hr NR indicated they were not planning to evaluate the cask for the one foot drop test specified in 10 CFR Part 71 as a normal condition of transport. NR considers that a one foot drop for a rail cask would be an accident and not a normal condition of transport. The NRC staff indicated that all previous spent fuel casks have been evaluated for a one foot drop; at least in the orientation in which the cask is shipped.hh agreement was reached on the subject.
NRC staff suggested to NR that prior to conducting any model tests of the cask design, NR meet with the NRC staff to discuss the specific tests that are planned.
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R. W. Odgwd Richard H. eUdegaarden, Project Manager Transportation Branch Division of Safeguards and Transportation NMSS Distribution:
5M R Central File NRC POR Mtg Attendees SGTB Mtg File GBeveridge NMSS R/F SGTB R/F NRC, PDR OFC: SGT
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- CRChappell CEMa anald DATE:04/7.T/87:
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