Seismic Response Analysis of Unit 1 of Fukushima-Daiichi Nuclear Power Plant During the 2011 Off the Pacific Coast of Tohoku Earthquake Using Three-Dimensional Finite Element Method (2nd Report: Results of Eigenanalysis and Seismic Response Analysis)

This paper presents Part II of the report of our research on three-dimensional finite element seismic response analyses of a full-scale integrated model of the boiling water reactor and reactor building of Unit 1 at Fukushima-Daiichi Nuclear Power Plant subjected to the 2011 off the Pacific coast of Tohoku Earthquake of 9.0 Mw occurring on March 11, 2011. The previous paper （ Part I ） reported the developed analysis method, i.e., the parallel structural analysis solver ADVENTURE_Solid Ver.2 and its pre- / post-modules towards the K computer, model construction, the verification of the analysis model, and computation performance. Part II （ this paper ） reports the results of the eigenanalysis and seismic response analysis of the developed three-dimensional finite element model. These results were precisely compared with those of a lumped mass model. The overall responses of the two different models agreed reasonably well, although the three-dimensional finite element model succeeded in showing local responses more precisely. Finally, we concluded some key roles of petascale simulation for such practical and socially important problems.