APWR achieved capacity increase by approx. 30 percent of the electrical output, as compared to the latest 4-loop plant. Major components were scaled up to accommodate the increased output. In addition, APWR adopted the high-performance reactor core that enable a long cycle operation and the use of the MOX(Mixed Oxide) fuel. Meanwhile, further improvement of economy was pursued by scaling up the capacity which resulted in enhanced economy and efficient site utilization, through pursuit of simplifying systems/components and pursuit of compact layout.