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.