Determination of plutonium content in high burnup pressurized water reactor fuel samples and its use for isotope correlations for isotopic composition of plutonium

The content of plutonium isotopes in high burnup pressurized water reactor fuel samples was examined using both alpha spectrometry and mass spectrometry after anion exchange separation. The measured values were compared with results calculated by the ORIGEN-2 code. On average, the ratios (m/c) of the measured values (m) over the calculated values (c) were 1.22±0.16 for 238Pu, 1.02±0.14 for 239Pu, 1.08±0.06 for 240Pu, 1.06±0.16 for 241Pu, and 1.13±0.08 for 242Pu. Using the Pu data obtained in this work, correlations were derived between the alpha activity ratios of 238Pu/(239Pu+240Pu), the alpha specific activities of Pu, and the atom % abundances of the Pu isotopes. Using these correlations, the atom % abundances of the plutonium isotopes in the target samples were calculated. These calculated results agreed within a range from 2 to 8% of the experimentally derived values according to the isotopes of plutonium.

► Contents of Pu isotopes in high burnup PWR fuel samples were determined.
► Correlations were derived between the parameters obtained from the Pu data.
► Atom % abundances of the Pu isotopes in the target samples were calculated.