Re: Criteria for testing ovrpacks and UF6 Shipping containrs

[RuthWeiner@AOL.COM]

from the NUREG-6672 data for a 3-inch steel cask with a neutron shield, which 

would thermally behave similarly to a TRUPACT-II, the inner surface 

temperature in a 1000 deg. fire would be about 230 deg. C after 30 minutes 

and about 265 deg. C after an hour.  Actually this is probably a conservative 

estimate, because it is difficult to get an engulfing fire around a 

TRUPACT-II.



Information on shipping UF6 cylinders can be found in 49 CFR 173 and in the 

manual published by USEC.  If the U-235 assay is 1% or more (of the uranium), 

the cylinder must be shipped in an overpack.   All UF6  cylinders shipped 

without an overpack must be shipped with a tamper-proof valve protection 

device.  (The valves are the most vulnerable parts of the cylinders 

generally.  48X and 48Y are built to withstand 400 psig,.



USEC has an excellent manual on handling UF6 (USEC-651, Rev. 8)..  I would 

contact them via their web page about training and precautions for emergency 

responders



http://www.usec.com



Ruth Weiner

ruthweiner@aol.com

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