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Report No.

Decontamination of radioactive water from a severe nuclear accident by ferrocyanides precipitation and titanium oxide adsorption

Nakamura, Masahiro  ; Takahatake, Yoko  ; Watanabe, So  ; Koma, Yoshikazu  ; Shibata, Atsuhiro  ; Nakajima, Yasuo  

In the emergency cooling procedure of the reactor vessel of TEPCO's Fukushima Daiichi Nuclear Power Plant, massive amount of radioactively contaminated water containing salt was generated due to the injection of seawater as a countermeasure against fuel meltdown. This contaminated water has been processed for re-use as reactor coolant by zeolite adsorption, precipitation and desalination. Extensive analysis of the water revealed that major radioactive nuclides contained are $$^{134,137}$$Cs and $$^{90}$$Sr of fission products accompanied with some activation products including $$^{60}$$Co and $$^{54}$$Mn. In order to establish a decontamination system of water resulting from a severe nuclear accident, an efficient decontamination process of nuclides above mentioned is required. A new decontamination process, which consists of simultaneous decontamination of radioactive transition metals and Cs by ferrocyanides precipitation together with titanium oxide adsorption for Sr decontamination is investigated.



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