Validation of the generic TRUEX model using data from TRUEX demonstrations with actual high-level waste Page: 33 of 49
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21
rare-earth stripping occurred because the nitrate activity in the aqueous strip solutions was
overestimated. We were ignoring the rare earth-nitrate complexes, which act to lower the
available uncomplexed, or free, nitrate. Nitrate complexation was added to the GTM in
version 3.1. Results reflecting the inclusion of nitrate complexation are given in the next
section.
The differences between GTM predictions and the PNC results for stripping
of rare earths, Am, and Cm could also be explained if the flow rate in the aqueous strip
solution was higher than reported in Table 1. As we did for stage efficiency, different
aqueous strip flow rates could be simulated to find which best described the PNC
experimental results for this section.
2. Nitrate Complexation
All the flowsheets results given in Section IV.B.1 (Figs. 5-16) were simulated
by using GTM version 3.0.1, which did not account for nitrate complexation. By including
nitrate complexes in version 3.1, we have significantly improved the GTM's fit to the PNC
stripping data for Am, Cm, Ce, and Eu, as shown in Figs. 17-20.
We have also included in Fig. 21, for comparison purposes, the curium
concentration profile calculated by both versions of the GTM for the TRUEX flowsheet
used for processing the Mark 42 targets from ORNL [BATTLES]. The basic TRUEX
flowsheet for processing the Mark 42 targets is given in Fig. 22. The experimental values
109
GTM 3.0.1
Fig. 17. Stagewise Aqueous and
Organic Phase Concentration
E 10' Profile for Americium in the
Strip Section. Shown are
0 GTM31 0 the GTM simulation for
americium(III) at 100% stage
efficiency for Run 2 calculated
0 ,0 5 o using GTM versions 3.0.1 and
3.1 and the experimental
results obtained for 241Am plus
104 . Pu_238.Am_241_aq 0 238Pu for this run.
O Pu_238+Am 241 org
Amaq
----- Amorg
103
20 23 26 29 32 35
Stage Number
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Regalbuto, M.C.; Aase, S. & Vandegrift, G.F. Validation of the generic TRUEX model using data from TRUEX demonstrations with actual high-level waste, report, August 1, 1995; United States. (https://digital.library.unt.edu/ark:/67531/metadc619858/m1/33/: accessed April 25, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.