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Report No.

Evaluation of sodium radioactivity in the primary system of the prototype fast reactor Monju

Mori, Tetsuya ; Ohgama, Kazuya   ; Hazama, Taira 

In this study, the sodium radioactivity of $$^{24}$$Na and $$^{22}$$Na in the primary system measured in the prototype fast breeder reactor Monju was evaluated, and the reliability of measurements and calculations was examined. The calculated-to-experiment (C/E) values and their uncertainties for $$^{24}$$Na and $$^{22}$$Na radioactivities were 0.97-1.07 and 8.1%-11.0% and 1.03-1.16 and 23.3%-24.1%, respectively, using JENDL-4.0 nuclear data library. The $$^{22}$$Na radioactivity calculated with ENDF/B-VIII.0 was larger by 40% than those calculated with JENDL-4.0 and JEFF-3.3 due to the $$^{23}$$Na(n,2n) cross-section discrepancy. The importance of the $$^{22}$$Na neutron capture effect was also confirmed herein for the accurate evaluation of the $$^{22}$$Na radioactivity. The experimental data was judged to be useful for validating the calculation method for improving the reliability of the future designs of sodium-cooled fast reactors.



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Category:Nuclear Science & Technology



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