CHEMICAL ENGINEERING DIVISION SEMIANNUAL REPORT, JULY-DECEMBER 1963 Page: 63 of 431
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60
steel rods. The trickle heaters are designed to bring the reacting gas up to
reacting temperature (900*C) before the gas enters the titanium sponge bed,
where the nitrogen is removed. The titanium sponge bed is contained in a
Hastelloy "X" pipe 8 in. OD by 26 in. high, lined with Type 316 stainless
steel which possesses good resistance to reaction with the sponge. The
sponge bed consists of approximately 40 lb of - 1/2 in. +20 mesh titanium
sponge.
The gas will then be passed through the second trickle
heater (now off) and into the second pebble bed regenerative heat exchanger,
where the gas will be cooled and the heat content of the gas stored for future
use. The gas will then flow through the four-way valve into a water-cooled
gas cooler, where its temperature will be reduced to room temperature, and
then into the surge tank for recirculation. Nitrogen will be fed into the argon
stream, immediately before the surge tank, through a standard rotameter.
Makeup argon will also be added at this point.
The pressure drop around the system is expected to be
between 1 and 2 psi. The blower used to circulate the gas is designed to
operate at inlet pressures of from 0 to 2 psig and, by variation of the blower
speed, at outlet pressures of from 1 to 12 psig. At the expected system
pressure drop, the circulation rate can be varied from 0 to 50 cfm. The
blower, which was manufactured by M-D Blowers Inc., is of special design
to prevent air and oil leakage into the circulating gas.
It is intended to operate the four-way valve on a time
cycle so that at a predetermined time, the valve will change position and
reverse the flow of gas through the purification system in order to recover
the sensible heat stored in the pebble bed regenerative heat exchanger.
2. Processes Employing Liquid Metal Solvents
Several processes are being developed which employ liquid metals
and salts as processing media. The skull reclamation process is under
development for recovery of the fissionable material remaining in the
crucible residue (skull) after a melt refining operation. Small-scale runs
for demonstration of this process have been completed. Process operations
are also being conducted in engineering-scale equipment (about one-half of
full plant scale). Preliminary work has been done on a process modification
which permits the handling of nondecladdable EBR-II fuel pins by the skull
reclamation process.
Work was continued on the development of a liquid metal process
for the extraction of plutonium from EBR-II blanket material. Emphasis is
presently being given to work related to the concentration of the plutonium
product solution by evaporation of the solvent metals.
Laboratory work is also under way on recovery processes for
fuel materials which contain plutonium as a fissionable material. Engineering
studies have been started in support of these processes.
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CHEMICAL ENGINEERING DIVISION SEMIANNUAL REPORT, JULY-DECEMBER 1963, report, May 1, 1964; Illinois. (https://digital.library.unt.edu/ark:/67531/metadc866455/m1/63/: accessed March 28, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.