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Analysis of actinides in the primary coolant of a WWER-440 type reactor
Authors:N. Vajda  J. Larosa  T. Pintér  G. Keömley  D. Bódizs  Zs. Molnár
Affiliation:(1) Institute of Nuclear Techniques, Technical University, Budapest, 1521 Budapest, (Hungary);(2) Chemistry Division, IAEA Laboratories, 2444 Seibersdorf, (Austria);(3) Paks Nuclear Power Plant, P.O. Box 71, 7031 Paks, (Hungary)
Abstract:A simple and effective method has been developed for the determination of the transuranium isotopes in primary coolant samples of WWER-440 type reactors. Membrane filters containing undissolved particles from about one liter coolant were destroyed by mineral acids, then americium-curium isotopes and neptunium-plutonium isotopes were coprecipitated sequentially with NdF3 based on their different redox behavior. Alpha-spectra were determined by silicon semiconductor detectors connected to multichannel analyzers. Activity ratios measured in a reactor unit with a failed fuel element were compared with calculated values of the same type of reactor under similar conditions. Parameters of the defective fuel (burnup, original enrichment) could be estimated.
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