Uranium Metal Dissolution in the Presence of Fluoride and Boron Page: 7 of 22
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WSRC-TR-2003-00500, Rev. 0
Page 6 of 21
It should be noted that the first gas generation test (10M HNO3) was performed with an
inverted burette to capture the gas and measure its volume. However, it was found that
the water in the burette was absorbing the nitrogen dioxide (NO2) from the gas phase
faster than anticipated. As a result, the gas volume could not be measured. Nonetheless,
a gas sample could still be obtained from the dissolution vessel. Also, the gas generation
test at 1M HNO3/ 0.025M KF and 2 g/L boron was initiated at room temperature to
observe the room temperature gas generation and mixing in support of the mixing studies
discussed below.
Mixing Studies
Another system was set up to observe the mixing that occurs during dissolution of
uranium metal in a simulated dissolver insert at room temperature. No external mixing
was provided so that system mixing was solely a function of gas generation due to
reaction. The tests aim to determine whether dissolved uranium concentrated in a
stagnant layer around the piece that was dissolving, hence creating a criticality concern.
A picture of the system used for the mixing studies is provided in Figure 3. The outer
tube (LEFT) represents the dissolver that will contain the bulk dissolver solution. The
simulated dissolver dissolver insert is shown CENTER and RIGHT. The simulated
dissolver insert contains a perforated plate up from the bottom of the dissolver insert,
similar to the actual dissolver insert, to allow liquid to access the sample from above andj
41"
Figure 3. Mixing Test Assembly
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Pierce, Robert A. Uranium Metal Dissolution in the Presence of Fluoride and Boron, report, February 2, 2004; South Carolina. (https://digital.library.unt.edu/ark:/67531/metadc739747/m1/7/: accessed July 17, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.