As the lessons learned by the Fukushima Daiichi NPP accident, Chubu Electric Power carried out emergency safety measures in Hamaoka NPP immediately and announced the plan of countermeasures for tsunamis in the NPP including the 18m-height protection wall in July 2011. Furthermore, the company announced the additional severe accident countermeasures in the NPP in December 2012, such as installation of the Filtered Containment Venting System and increasing the height of the protection wall from 18m to 22m. In this paper, we present major safety upgrading activities against tsunamis and earthquakes at the NPP.
