Development of MPS method and analytical approach for investigating RPV debris bed and lower head interaction in 1F Units-2 and 3

• Published in: Nuclear engineering and design Vol. 379; p. 111244
• Main Authors: Takahashi, Nozomu, Duan, Guangtao, Yamaji, Akifumi, Li, Xin, Sato, Ikken
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 01.08.2021; Elsevier BV
• Subjects: 1F Unit-2, Unit-3; Algorithms; Boundary conditions; Conductive heat transfer; Conglomerates; Convective heat transfer; Debris; Detritus; Failure modes; Heat transfer; In-vessel debris re-melting; Investigations; Liquid metals; Melting; MPS method; Nuclear power plants; Nuclear reactor components; Nuclear reactors; Plant debris; Pressure vessels; Reactors; Relocation; Sensitivity analysis; Severe accident; Speedup algorithm; Speedup algorithm; In-vessel debris re-melting; MPS method; Severe accident; 1F Unit-2, Unit-3

•Modified fluid-wall pressure boundary condition for MPS method is developed.•Strategies to suppress instability for MPS rigid-body calculation are developed.•Calculation cost is greatly reduced by a newly developed speedup algorithm.•Simulation of in-vessel debris re-melting phase of 1F reactors is...