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ふげん汚染配管切断時の放射性粉じん飛散挙動試験

Radioactive aerosol particle behaviors in the cutting test for contaminated piping of Fugen Reactor

島田 太郎 ; 高村 篤*; 神谷 敦司*; 助川 武則; 田中 忠夫 

Shimada, Taro; Takamura, Atsushi*; Kamiya, Atsushi*; Sukegawa, Takenori; Tanaka, Tadao

新型転換炉ふげんから切り出した原子炉冷却系等の配管をグリーンハウス内で切断し、放射性粉じんの飛散率,粒径分布及びフィルタの捕集効率を測定した。筒状通常配管についてのCo-60の飛散率は18$$sim$$23%と、半割した配管における飛散率34$$sim$$43%と比較して約50%低減されることを明らかにした。粗じんフィルタの捕集効率は55$$sim$$80%であったが、1$$mu$$m未満の粒子は捕集できないことがわかった。また、HEPAフィルタの捕集効率は99.9%以上であることを確認した。

Dispersion ratios, size distribution of particles and filtration efficiencies were measured when piping for reactor cooling system at Fugen reactor was segmented in the contamination control enclosure. Dispersion ratio of Co-60 was observed to be 18 to 23% for normal piping and that to be 34 to 43% for vertically segmented piping, which was half of the normal. Filtration efficiency of pre-filter was observed to be 55 to 80%, while particles smaller than 1micrometer were not able to be collected. It was confirmed that the filtration efficiency of HEPA filter was more than 99.9% for Co-60.

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