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軽水炉-高速炉移行期の高速炉炉心検討,3; リサイクルTRU組成に応じた反応度係数変化幅の検討

Fast reactor core design considerations for the LWR-FBR transition period, 3; Reactivity coefficients variation depending on TRU compositions

川島 克之; 水野 朋保

Kawashima, Katsuyuki; Mizuno, Tomoyasu

高速炉で軽水炉使用済燃料回収TRUを受け入れる際には、予想されるTRU組成の変動を考慮して炉心特性を評価しておく必要がある。本検討では、出力750Mweの中型炉MOX燃料炉心(高内部転換型炉心)において、種々の軽水炉使用済燃料回収TRU組成、並びにそれらを高速炉でリサイクルしたときのTRU組成に対する反応度係数の依存性を明らかにするとともに、安全解析で用いる反応度係数の変化幅を検討した。

When a fast reactor is loaded with fuel with a various TRU composition from the LWR spent fuel, it is necessary to evaluate a core characteristics considering a change of the expected TRU composition. In this study, the dependence of the reactivity coefficients for various kinds of TRU composition from LWR spent fuels and a fast reactor multi-recycled fuels is examined and a range of the reactivity coefficients change to be used in safety analysis is shown for the MOX fuel core (high internal conversion type core) of the medium-sized 750MWe reactor.

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