Fig.1-41　Prediction of boron compounds and release fractions in different atmospheres and their effects on cesium and iodine chemical forms

$Fig.1-41 Prediction of boron compounds and release fractions in different atmospheres and their effects on cesium and iodine chemical forms$

Fig.1-41　Prediction of boron compounds and release fractions in different atmospheres and their effects on cesium and iodine chemical forms

Cesium metaborate is formed by the reaction between the released boron and cesium iodine, resulting in generation of gaseous/volatile iodine compounds from the excess iodine. The calculation shows that the formation of gaseous/volatile iodine can be suppressed under a steam-starvation atmosphere because of a lower boron release. This lower release of boron is caused by the possible formation of boron-stainless steel reaction products during the degradation of BWR control rods.

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