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Report No.

Investigation of the contamination on the operation floor of unit 2 based on the radiochemical analysis data

Takahatake, Yoko  ; Koma, Yoshikazu  

Radioactive nuclides contaminated F1NPS on the severe accident. It is necessary to discuss about radioactive waste processing and disposal. To investigate contamination process for the waste is important to establish methodologies for their management. Operation floor of unit 2 reactor building was highly contaminated, and boring cores of floor and ceiling were radiochemicaly analyzed. Comparing with distribution of $$^{137}$$Cs and dose rate indicated the difference of degree of contamination between the floor and ceiling. Contamination with $$^{238}$$Pu, $$^{241}$$Am and $$^{244}$$Cm was higher at the floor above the reactor shield plug, where is considered that the contaminated gas leaked. Degree of contamination of $$^{3}$$H, $$^{60}$$Co, $$^{99}$$Tc, $$^{241}$$Am and $$^{244}$$Cm were highest at the point of the opposite side of the blow out panel among several sampling point of the ceiling. From the activity ratio of $$^{235}$$U to $$^{238}$$U with samples, the origin of uranium was the damaged fuel.



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