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Report No.
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Criticality characteristics of fuel debris mixed by fuels with different burnups based on fuel loading pattern

Watanabe, Tomoaki  ; Okubo, Kiyoshi*; Araki, Shohei   ; Tonoike, Kotaro 

The fuel debris produced by the accident of the Fukushima Daiichi Nuclear Power Station (1F) is probably in a state of mixture of burned fuels with different burnups each other. In such a case, the mixing ratio of burned fuels in fuel debris would affect its criticality. This report shows computation results of criticality characteristics of fuel-debris compositions prepared by mixing nuclide compositions of burned fuels in various patterns based on a fuel loading pattern. The results indicate that fuel debris is potentially subcritical when 1-cycle fuels, whose average burnup is several GWd/t, are included homogeneously in fuel debris because remaining $$^{155}$$Gd and $$^{157}$$Gd in 1-cycle fuels works to reduce neutron multiplication. The results also indicate that $$^{155,157}$$Gd/$$^{235}$$U ratio well characterize criticality of fuel debris.

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