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Report No.

Failure evaluation analysis of reactor pressure vessel lower head in BWR due to severe accident

Kaji, Yoshiyuki  ; Katsuyama, Jinya  ; Yamaguchi, Yoshihito ; Nemoto, Yoshiyuki  ; Osaka, Masahiko  

To investigate the inhomogeneous temperature and stress distribution by geometrical complex of BWR lower head, the detailed 3D model of RPV lower head with control rod guide tubes and shroud supports are constructed and the 3D thermal hydraulic analysis of simulated molten pool and creep deformation analysis of lower head are performed using ANSYS Fluent / Mechanical finite element code. It is found that failure for BWR lower head might be caused by combination between melting failure in inner surface of lower head and creep failure in outer surface of lower head.



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