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Influence of pressure on cesium release from irradiated fuel at temperatures up to 2,773K

2,773Kまでの温度における照射済燃料からのセシウム放出に関する圧力の影響

工藤 保; 日高 昭秀; 中村 武彦; 上塚 寛

Kudo, Tamotsu; Hidaka, Akihide; Nakamura, Takehiko; Uetsuka, Hiroshi

本報告は、最高温度2,773Kは同様にして圧力だけ異なる最初の2回の照射済燃料からの放射性物質放出実験、VEGA-1及びVEGA-2で得られたセシウム放出における圧力の影響について述べたものである。1.0MPaの圧力で実施したVEGA-2でのセシウムの放出割合は、大気圧で実施したVEGA-1のそれより小さかった。圧力による両実験での放出速度の相違を定量化するために、セシウムの放出率係数を評価したところ、約1900K以上において、VEGA-1でのセシウムの放出率係数はVEGA-2実験のそれの約2.8倍であった。

This article describes the effects of system pressure on the cesium release obtained in the first two tests of radionuclides release from irradiated fuel, VEGA-1 and VEGA-2, which were conducted at the same maximum temperature of 2773K and different system pressures. The fractional releases of Cs in VEGA-2 test at 1.0MPa were smaller than those in VEGA-1 test at atmospheric pressure. In order to quantify the difference of the release rate in the two tests due to the pressure, the release rate coefficients of Cs were evaluated. The Cs release rate coefficient in VEGA-2 was smaller by a factor of about 2.8 than that in VEGA-1 at temperature above about 1900K.

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