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Report No.
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Radioactive aerosol particle behaviors in the cutting test for contaminated piping of Fugen Reactor

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

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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