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Oral presentation

Studies on relocation behavior of molten core materials in the core disruptive accident of sodium-cooled fast reactors, 5; A Behavior of a heavy metal jet with free surface condition of MPS method

Konomura, Mamoru*; Kamiyama, Kenji

no journal, , 

A behavior of a heavy metal jet which ran into a water pool was analyzed with the Moving Particle Semi-implict Method. A pressure calculation without a free surface condition proved useful to suppress unrealistic cavity.

Oral presentation

Studies on relocation behavior of molten core materials in the core disruptive accident of sodium-cooled fast reactors, 6; A Modelling of the tip of a heavy metal jet with MPS method

Konomura, Mamoru*; Kamiyama, Kenji

no journal, , 

A behavior of a heavy metal jet which ran into a water pool was analyzed with the Moving Particle Semi-implicit Method. A figure of the tip of jet was different from that of the experiment. We propose a modified calculating model with the MPS method.

Oral presentation

Estimation of the in-depth debris status of Fukushima Unit-2 and Unit-3 with multi-physics modeling, 3; Overview of the project and progress of the first year

Yamaji, Akifumi*; Furuya, Masahiro*; Oishi, Yuji*; Sato, Ikken; Li, X.*; Fukai, Hirofumi*; Madokoro, Hiroshi

no journal, , 

no abstracts in English

Oral presentation

Estimation of RPV damage and fuel debris relocation behavior in the PCV at Fukushima Daiichi Nuclear Power Station, 8; Numerical simulation of core material relocation behavior in the RPV lower head region

Li, X.; Yamaji, Akifumi*; Sato, Ikken*; Yamashita, Takuya

no journal, , 

This study presents a numerical evaluation of possible core material discharge behavior from the RPV lower head region including the penetrations (Control Rod Drive (CRD) Housing) in 1F Unit-2 with Lagrangian-based MPS method. Two-dimensional geometry is established to model CRD housing with simplified inner structures inthe center of RPV, with surrounding RPV walls and RPV insulation below. The initial temperature distribution/boundary conditions referenced the results from accident progression and global RPV CFD analysis (Series presentations (2), (5), and (7)). The results show that local CRD housing melting assumed at 15%Zr-85%Fe eutectic temperature (1523 K) before global RPV failure could result in melt discharge into the pedestal, which is consistent with the accident progression analysis and plant internal investigation results.

Oral presentation

Studies on relocation behavior of molten core materials in the core disruptive accident of sodium-cooled fast reactors, 3; A Simulation of a Heavy Metal Jet with MPS Method

Konomura, Mamoru*; Kamiyama, Kenji

no journal, , 

A behavior of a heavy metal jet which ran into a water pool was analyzed with the Moving Particle Semi-implic Method. A little pressurization proved useful to suppress unrealistic cavity which appeared in the pool.

Oral presentation

Analysis of fuel debris discharge behavior from the 1F Unit-2 RPV lower head region with MPS method

Bando, Yamato*; Yamaji, Akifumi*; Yamashita, Takuya

no journal, , 

no abstracts in English

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