Release and transport behaviors of non-gamma-emitting fission products and actinides in steam and hydrogen atmospheres

水蒸気及び水素雰囲気における非線放出核種の核分裂生成物及びアクチニドの放出移行挙動

三輪 周平  ; Ducros, G.*; Hanus, E.*; Bottomley, P. D. W.*; Van Winckel, S.*; 逢坂 正彦  

Miwa, Shuhei; Ducros, G.*; Hanus, E.*; Bottomley, P. D. W.*; Van Winckel, S.*; Osaka, Masahiko

水蒸気及び水素雰囲気下での非線放出核種の核分裂生成物(FP)及びアクチニド13核種の放出移行挙動を、FP放出移行実験VERCORSにおける沈着物の化学分析結果に基づいて評価した。化学平衡計算による化学形態を考慮して放出移行挙動を評価した結果、ストロンチウムの放出は水素雰囲気で促進され、一部は低温領域まで移行していくこと、ウランの放出は水蒸気雰囲気で促進される一方で、高温領域に留まること等、新規な知見を得た。

The release and transport behaviors of 13 non-gamma-emitting fission products (FPs) and actinides in steam and hydrogen atmospheres were investigated based on the chemical analysis of their deposits on the components of VERCORS test loops. The new findings were obtained; strontium release was significantly enhanced in hydrogen atmosphere and a part of released strontium was transported towards the lower temperature region, uranium release was enhanced in steam atmosphere but most of released uranium deposited at high temperature region.