[1H09-12] Fluid and Accident Analysis 2

[1H11] Estimation of plant condition of Fukushima Daiichi Nuclear Power Station

(4)Analysis of measured values of released radionuclide into atmosphere

*Masashi himi Himi¹, Naotoshi Tominaga¹, Koichi Nakamura² (1. AdvanceSoft, 2. Criepi)

Keywords:Fukushima Daiichi Nuclear Power Station, severe accident, core failure, core debris, MELCOR, radioactive nuclides

The purpose is to estimate the plant state by analyzing the FP measurements after the Fukushima Daiichi accident. The thermal behavior of fuel debris was estimated in consideration of the published alternative water injection history. Along with the analysis of FP, the situation of accident progress was supplemented. Perform analysis to reproduce the FP measurement value by MELCOR and clarify what model should be considered.