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Report No.
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Measurement and analysis of $$^{238}$$U doppler reactivity effect in FCA cores simulating light-water-moderated MOX fuel lattices

Ando, Masaki  ; Fukushima, Masahiro  ; Okajima, Shigeaki  ; Kawasaki, Kenji*

$$^{238}$$U Doppler reactivity effect was measured using the FCA facility for the purpose of obtaining the data of the $$^{238}$$U Doppler reactivity effect in light-water-moderated MOX fuel and evaluating the prediction accuracy of current analysis code systems and nuclear data library. The experimental data of the Doppler reactivity effect from room temperature up to 800$$^{circ}$$C were obtained using various cylindrical natural-uranium samples in the mockup cores for MOX-fueled LWR with different neutron energy spectra and in a uranium fueled core. The analyses were performed using current standard analysis code systems for fast and thermal reactors with JENDL-3.3 data library. Both the analyses yielded calculated/experimental (C/E) ratios of 0.96 to 1.06 for the MOX cores, which showed a good agreement with the experiment within the experimental error and were similar to those in the uranium core.

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Category:Nuclear Science & Technology

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