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Report No.

Passive $$gamma$$ spectrometry of low-volatile FPs for accountancy of special nuclear material in molten core material of Fukushima Daiichi Nuclear Power Plant; Detectability of leakage $$gamma$$-ray and fundamental characteristics of U-Ce/Eu compound

Tomikawa, Hirofumi; Sagara, Hiroshi*; Shiba, Tomooki*; Ishimi, Akihiro ; Osaka, Masahiko  ; Watahiki, Masaru; Kuno, Yusuke

For nuclear material accountancy of molten core material in Fukushima Daiichi Nuclear Power Station units 1, 2 and 3 (1F1, 1F2 and 1F3), a variety of technologies are being evaluated from the viewpoint of applicability for in-situ measurement. For one of the technologies, a feasibility study of passive $$gamma$$ spectroscopy of low-volatile fission products (FPs) has been performed by reviewing TMI-2 experience, and studying the correlation of actinides and FPs inventory in the cores of 1F1, 1F2 and 1F3, considering the sensitivity of axial neutron spectrum, void, burnup, enrichment distribution unique to BWR fuel, and leakage $$gamma$$-ray from molten core materials sphere model. In this paper, numerical simulation of leakage $$gamma$$-ray from molten core materials in a hypothetical canister is dealt with for determination of radioactivity of low-volatile high-energy emission FPs, which could be utilized for special nuclear material (SNM) quantity estimation coupled with SNM/FPs ratio derived from core inventory calculations. This paper also presents the summary of survey results of high-temperature chemical stability of lanthanides coexisting with nuclear material in a certain atmospheres and temperatures simulating severe accident.



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