Compatibility of packaging components with simulant mixed waste Page: 3 of 5
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Before describing the results of the analyses to date, it should be mentioned that a complete data
analyses of all testing performed to date has not been completed. The principle reason for this is that a
number of the 180-day experiments are still in progress. Until all experiments are completed, it is not
possible to fully understand the implications of these studies. In Figure 1, we present the results of
four measurements, specific gravity changes, dimensional changes (volume changes), hardness
changes, and tensile strength changes.
1 DAYS EXPOSURE TIME
SDAOATS EXPASPE TIME
00.T 1W AYS
~ DAYS EMOSURE TIME
MAERA -y'0-T6L TOT
-00 k 00 +OATS
.0 DAY ASARE DUME
Figure 1. Comprehensive testing results of five liner materials after exposure to -40 kGy of
gamma radiation and the aqueous simulant waste at 60*C (a) specific gravity changes,
(b) dimensional changes, (c) hardness changes and (d) tensile strength changes.
Note: 180 day data currently being obtained for hardness and tensile strength changes.
Based on the limited results presented here, it is worthwhile to attempt to identify the one material
which displayed the greatest compatibility towards the simulant mixed waste under these conditions.
In order to accomplish this, a ranking scheme was developed. By identifying the material which had
the best test performance under each test condition and assigning an arbitrary value of one, suming
these four test values gave a overall value. That material with the lowest value was most compatible.
Using this very simplistic approach, the fluorocarbon Kel-Fru was identified as the material which is
most compatible with this simulant mixed waste under these conditions. Interestingly, Teflon was
found to be the least compatible material.
We have developed a chemical compatibility program for the evaluation of plastic packaging
components which may be incorporated in packaging for transporting mixed waste forms. From the
limited data analyses performed to date in this study, we have identified the fluorocarbon Kel-Frm as
having the greatest chemical compatibility after having been exposed to 40 kGy gamma radiation
followed by exposure to the Hanford Tank simulant mixed waste at 60 C. The most striking observation
from this study was the poor performance of Teflon under these conditions.
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Nigrey, P. J. & Dickens, T. G. Compatibility of packaging components with simulant mixed waste, report, April 1, 1996; Albuquerque, New Mexico. (digital.library.unt.edu/ark:/67531/metadc666714/m1/3/: accessed January 17, 2019), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.