| Abstract: | A technology has been developed for obtaining fuel tablets with the compositions (U, Th)O2, (U, Th, Ca)O2, and (U, Th)O2+MgO by combined precipitation of uranium, thorium, magnesium, or calcium components from inert solutions, followed by heat
treatment of the powders, compression into pellets, and sintering of the pellets. Work on optimizing the technological processes
for obtaining fuel pellets so as to obtain good pellet quality was performed. The effect of the properties of the precipitates
and powders, fabricated using different technological regimes on the properties of the finished objects was studied. The work
includes detailed investigations of powders (x-ray phase analysis, electron-microscopic investigation) and sintered fuel tablets
(change in the geometric dimensions as a result of sintering, determination of the density, and study of the microstructure).
The behavior of fuel compositions (U, Th)O2 and (U, Th)O2+MgO in contact, with coolants under conditions where the fuel elements become unsealed was studied: with water at 300°C and
sodium at 700°C. 3 figures, 3 tables, 6 references.
State Science Center of the Russian Federation-A. I. Leipunskii Physics and Power-Engineering Institute. Translated from Atomnaya
énergiya, Vol. 88, No. 5, pp. 346–353, May, 2000. |
