Fukushima Unit 2 Accident Simulation with MELCOR 2.1

[+] Author and Article Information
Rafael Bocanegra

ASME Membership Universidad Politécnica de Madrid C/ José Gutiérrez Abascal, 2. 28006 Madrid, Spain

Valentino Di Marcello

Karlsruher Institut für Technology Karlsruhe, Germany

Victor H. Sánchez-Espinoza

Karlsruher Institut für Technology Karlsruhe, Germany

Gonzalo Jiménez

Universidad Politécnica de Madrid Madrid, Spain

1Corresponding author.

ASME doi:10.1115/1.4038062 History: Received September 26, 2016; Revised September 12, 2017


A VTT Fukushima Daiichi Unit 3 MELCOR model [1] was modified to simulate the Fukushima Daiichi Unit 2 accident. Five simulations were performed using different modeling approaches. The model 1F2 v1 includes only the basic modifications to reproduce the 1F2 accident. The model 1F2 v2 includes the same modifications used in 1F2 v1 plus the WW improvement. In the 1F2 v3 model, the RCIC logic was modified to avoid the use of tabular functions for the mass flow inlet and outlet. As a result of this analysis it is concluded that there is a strong dependency on parameters which still have many uncertainties, such as the RCIC two-phase flow operation, the alternative water injection, the suppression pool behavior, the rupture disk behavior and the containment failure modes which affect the final state of the reactor core.

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