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. 1st report. Development of analysis method, model construction and verification of analysis performance

This research presents the recent development of the analysis system ADVENTURE, i.e., a parallel structural analysis solver ADVENTURE_–Solid Ver.2 and its pre-/post-modules, towards petascale computers such as the K computer with 10 petaflops peak performance, as well as its application to 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 the 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. Here, we precisely modeled its pressure vessel, containment vessel, suppression chamber, vent piping, a number of supports and the reactor building with a 200 million DOF finite element mesh. Then, we successfully solved its dynamic response in 65 s. We report our research results in two papers, i.e., Part I and Part II. Part I (this paper) reports the developed analysis method, model construction, verification of the analysis model, and computation performance. Part II reports the results of an eigenanalysis and a seismic response analysis. Finally, we concluded some key roles of petascale simulation for such practical and socially important problems. (author)