Remote coating of HTGR fuel particles Page: 4 of 12
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Fluidized bed: particle coating equipment and processes
are being de.aeloped far rm ote. coating of recycled HTGR fuel. Porous
carbo ratings, whfcfh pmroide- void space for accommodation of fission
produce s and whici urabt-- the- outer coating from recoiling fission
fragments, are ap-Ied by; drcomposition of acetylene diluted with
helium. Dense, .tong~, isotropic carbon coatings and perhaps SiC
coatings will be requit 'fbr fission product containment. The
high-density pyrntytt'c: carbon. coating is applied by decorposition
of propylene. Coatings of SiC. are formed by decomposition of
methyltricharosdManwr,, 'CH*C3S:, diluted with hydrogen. Tempera-
tures range from. I UM tor 1700*C, depending on ga& type and coating
The reference neayci- fissile particle is of the BISO-type and
consists of a 35&-tm--d. r sv--gel (Th0. , Uo. s )02 kernel coated
with buffer and isotnoticarbon coatings each about 100 um thick.
For particles of tdt's type,. about 10 kg of heavy metal will be
coated daily ir te TU1 YR pilot. plant. Such particles have been
produced numerous t:1e ir.- to 3-kg batches in the 5-in.-diam
prototype remotely aperated coating furnace which has been described
previously. 2.. A Ahag-. extensive' additional equipment modification
=R. B. Pratt arrd S.. E.. Bolt, Status and Progress Report for Thorium
Fuel Cycle Development fbr-Feriod Ending Dec. 31, 1966, OR.NL-4275, pp. 61-78.
'F. J. Furmar,, JMr-..,, J.. D. Sease, and A. L. Lotts, "Economics and
Technology of High-Temperature Gas-Cooled Reactor Fuel Refabrication,"
Symposium on Sol-Gel Processes and Reactor Fuel Cycles, Gatlinburg, Tennessee,
May 4-7, 1970, pp.. 281-308,. COLF-700502.
"W. J. Lackey, et a1.,. Gas-Cooled Reactor and Thorium Utilization Programs
___ .....1q., 719.Z, ORNL-4760, pp. 45-50.
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Lackey, W.J.; Pechin, W.H. & Sease, J.D. Remote coating of HTGR fuel particles, article, January 1, 1973; Tennessee. (https://digital.library.unt.edu/ark:/67531/metadc1028225/m1/4/: accessed April 20, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.