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KMID : 0371819980300020099
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Nuclear Engineering and Technology
1998 Volume.30 No. 2 p.99 ~ p.111
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Microstructural Properties of the Insoluble Residue in a Simulated Spent Fuel
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Kim, J. S.
Song, B. C./Jee, K. Y./Kim, J. G./Chun, K. S.
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Abstract
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Chemical composition of the insoluble residue in a simulated spent PWR fuel(SIMFUEL) were studied. SIMFUELs were prepared by adding calculated amount of FP(fission product) elements with a burnup of 3.6% FIMA(fission per initial metal atom) to uranium in nitrate solution, evaporating the mixed solution to dryness, calcining at 900℃ in a stream of 4% Hz + 96% He, and heating the pellet at 1400℃ under high and low oxygen potentials. Insoluble residue was obtained from the dissolution of the SIMFUEL with HNO3(1:1). The chemical composition of the SIMFUELs and the insoluble residues was determined by EPMA(electron probe microanalysis), XPS(X-ray photoelectron spectroscopy) and by XRD (X-ray diffraction) measurements. All of the insoluble residues suspended and precipitated were composed mainly of Mo, Ru with a small amount of Zr, Rh, Pd and Cd. The amount of insoluble residue(<1 wt.%) and a Mo/Ru ratio decreased with increasing oxygen potential. Formation of the-zirconium molybdate precipitate, ZrMo207(OH)2(H2O)2, was observed in the residues. The possible role of Mo on the phase formation was discussed in regard to oxygen potential.
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