The Advanced Power Reactor 1400 (APR1400), with a rated power of 1400 MWe, is the largest two-loop PWR currently available. The APR1400 is an evolutionary reactor developed in the Republic of Korea, based on the accumulated experience from the design and operation of the 1000 MWe Korean Standard Nuclear Power Plant and from the EPRI URD (EPRI, 1995, 1999). The APR1400 incorporates a number of improvements to meet operators’ needs for enhanced safety, performance and economics and to address new licensing requirements such as the mitigation of severe acci­dents. The APR1400 has a very characteristic configuration, with two large steam generators and four reactor coolant pumps in a ‘two hot legs and four cold legs’ arrangement. The APR1400 also features fully digital instrumen­tation and control (I&C), and a main control room designed with full consideration of human factors. The APR1400 incorporates safety systems with both active and passive characteristics, and has also been designed to take advantage of modularization and prefabrication construction tech­niques to ensure a predictable construction budget and schedule. Two

APR1400 units are currently under construction in the Republic of Korea (Shin-Kori 3 and 4), and they are expected to enter commercial operation in 2013-14. The APR1400 has also been selected for the first four units that will be built in the United Arab Emirates.