Full Scale Seismic Response Simulation of Nuclear Power Plant Using K-Computer

Abstract eng:
In worldwide over 430 nuclear power plants (NPPs) are under operation to provide electric energy. At the same time, a huge number of earthquakes occur everywhere in the world. Establishing reliable and accurate seismic proof design methodology plays a key role in maintaining safety and stability of those NPPs regardless of operation or not. Recent strong earthquakes attacking some Japanese NPPs such as Niigataken-Chuetsu-Oki (NCO) earthquake with 6.8 Mw on July 16, 2007 and The Great East Japan Earthquake / Tsunami with 9.0 Mw on March 11, 2011 recalled its practical importance seriously. On March 11, 2011, 11 units among 14 units of 4 NPP facilities located along the east coast of Tohoku area were under operation. The 11 units were safely shutdown with automatic scram systems. Among 6 units of TEPCO’s Fukushima Dai-ichi NPP Facilities, Nos.1-4 units failed in containing radioactive materials inside due to long term Station Blackout (SBO) due to a series of Tsunami waves of huge height far exceeding a design limit. Actual causes of the accidents and actual damaging processes of the NPPs’ structures, systems and comonents (SSCs) due to either or both seismic loading and Tsunami waves need to be precisely investigated. There is now an urgent and crucial demand in accurately evaluating seismic proof capabilities of each NPP subjected to strong earthquake far exceeding its design limit, and in taking appropriate actions a priori to prevent further accidents. Since September 2007, we have been developing a multi-scale and multi-physics based numerical simulator for quantitatively predicting actual quake-proof capability of ageing NPPs subjected to strong earthquake. One of the core simulation softwares is an Open Source Parallel FEM system named ADVENTURE [1-5]. In this talk, we describe the latest status of the implemented solution algorithms, pre and post tools, and simulation results, i.e. A seismic response analysis of one billion DOFs high fidelity model of Unit 1 of TEPCO’s Fukushima Dai-ichi NPP facilitys using ADVENTURE Solid Ver.2 on K-computer of 10 Petaflops peak performance [6].

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