Experiments are reported involving 2 5 D2O and three small HjO internal thermal coluinns (ITC), or flux traps, inside annular thoria-urania cores. The moderator and the radial reflector were D2O. Several different fuel densities were used. ITC's were as large as 104 x 104 cm. Radial activation plots indicated central peaks up to ten times the fuel zone average at the midplane, and five times the fuel zone maximum. Available fuel and facilities were used to obtain data for evaluation of computational methods, which w^ere reported separately. The limited selection of fuel prevented optimization of experimental cores.
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