Abstract

An approach is proposed to use the isotope ratios93Zr/96Zr,91Zr/96Zr and101Ru/104Ru for the determination of plutonium contriubtion to the total burnup of a spent nuclear reactor fuel of low initial enrichment in235U (3.6%). This approach was verified by determining the total burnup of the fuel from the137Cs and148Nd monitors and subtracting the partial burnup due to235U from the value obtained.

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