Optimizing the National TRU waste system transportation program. Page: 3 of 8
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Spectrum 2002, August 4-8, 2002, Reno, NV
amended several times, primarily to expand the allowable payload of the packaging and
allow shipment under less restrictive conditions. The NRC imposed strict limits for
flammable, volatile, and semi-volatile gas concentrations in each waste package to ensure
safety during the 60-day shipping period. Two primary limits imposed by the NRC on the
shipping payload are: 1) the concentration of flammable gases (i.e., hydrogen and
methane), must not exceed 5 percent (by volume), and 2) the gas phase concentration of
flammable volatile organic compounds (VOCs) must be less than 0.05 percent (500
ppm). As a result, 20-40% of the TRU waste currently stored at the DOE sites could not
be shipped in the TRUPACT-Il unless it would be repackaged (which would result in a
significant volume increase and an increase in potential exposure), prior to the approval
of Revision 19 of the TRUPACT-Il Safety Analysis Report (SAR).
Revision 19 of the TRUPACT-Il SAR was by far the most complex submitted to date to
the NRC for approval. This revision included: 1) revised packaging and payload
assembly drawings to remove unnecessary details and clarify requirements; 2) simplified
chemical compatibility methodology-all chemicals identified by the sites were included
and listed; 3) revised pressure calculations to increase wattage limits; 4) additional
methods to determine aspiration times based on measurement inside the rigid liner at the
time of venting; 5) increased decay heat limits for 55-gallon drums overpacked in a
standard waste box; 6) addition of 100-gallon drums as an authorized payload container;
7) two new shielded pipe configurations (S100 for neutron [sealed sources) and S200 for
gamma; 8) revised Operations, Maintenance, and Acceptance Tests to incorporate lessons
learned from experience to date; and 9) made the TRU Authorized Methods for Payload
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Lott, S. A. (Sheila A.) & Countiss, S. (Sue). Optimizing the National TRU waste system transportation program., article, January 1, 2002; United States. (digital.library.unt.edu/ark:/67531/metadc932813/m1/3/: accessed November 18, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.