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Report No.

Current status of accompanying FP passive $$gamma$$ measurement to special nuclear material quantification in fuel debris

Shiba, Tomooki  ; Sagara, Hiroshi*; Hiyama, Toru; Tomikawa, Hirofumi

In response to the accident at Fukushima Daiichi Nuclear Power Station, passive $$gamma$$ spectrometry has been researched and developed as one of the candidates of a mass measurement method of the special nuclear materials in molten core material. Among Fission Products (FPs) accompanied in molten core materials, some of them are very low-volatile and emit high-energy $$gamma$$ rays which enable to derive the mass of those FPs by passive $$gamma$$ spectrometry. Using the mass ratio between the FPs and nuclear materials, this technique provides the mass estimation of nuclear materials. This technique is relatively simple and was applied to the analysis of nuclear materials in the clean-up process of damaged Three Mile Island unit-2 (TMI-2) reactor. In the poster, we show the outlines of the project, the analytical and experimental results conducted until now, and the future plan of the project.



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