The main components that make up the reactor cooling system of a PWR nuclear power plant are responsible for the reactor cooling function and are vital for safety. These components are required to keep their integrity against the ground motion design specifications increased by the revision of the Regulatory Guide for Reviewing Seismic Design of Nuclear Power Reactor Facilities in 2006. Reliability improvement of their design, through the improvement and update of the evaluation technology enhancement, is also continuously carried out. We have accurately evaluated the seismic strength of the components using enhanced evaluation methods verified by large-scale tests, etc., and confirmed that they have sufficient reliability to withstand harsh seismic conditions. As a comprehensive nuclear plant manufacturer, we will continue to develop technologies that contribute to the further improvement of safety and reliability of nuclear power plants.
