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Report No.

Major safety and operational concerns for fuel debris criticality control

Tonoike, Kotaro ; Sono, Hiroki ; Umeda, Miki ; Yamane, Yuichi ; Kugo, Teruhiko ; Suyama, Kenya

JAEA is conducting studies on criticality control of the fuel debris formed in the accident of Fukushima-Daiichi site. A new control principle must be established, referring principles for existing facilities, and based on criticality characteristics of the debris. In accordance with the principle, safe and practical control has to be realized for the debris whose condition is uncertain at present. This report outlines the present condition of debris and Fukushima site, introduces examples of criticality analysis, and discusses control principles. Research subjects are also proposed to realize the control.



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