Development of the Korean next generation reactor arrangement

The Korean Next Generation Reactor(KNGR) is being developed as an evolutionary plant under the sponsorship of Korean government and KEPCO to meet the electricity requirements in the early part of the 21st century. The KNGR design is based on our successful experience of Korean Standard Nuclear Power Plants design such as YGN 3 is 4 and UCN 3 and 4. The type of reactor, its generating capacity, and the plant design concept were determined based on the feasibility study during conducted Phase 1 of the KNGR. This led to the establishment of the overall requirements for plant arrangement and their incorporation into the preliminary design. The principle behind these requirements is to incorporate the Severe Accident Features, the Advanced Design Features(ADF), the Passive Design Features(PDF) as well as the conventional requirements applied to the existing plants. Utility requirements derived from constructional and operational experiences have also been incorporated into the basic design of the KNGR. The KNGR arrangement is primarily affected by a double cylindrical concrete containment building and the increased capacity(1,350 MWe) of the Nuclear Steam Supply System which requires the larger containment size than the existing Korean Standard Nuclear Power Plant design. Additional aspects which could impact on the overall plant arrangement have been evaluated based on the criteria of separation, enhancement of safety, operability, maintainability, construct ability, and ALARA, and incorporated into the design as a result of the development process. Details of the preliminary arrangement including the requirements established for KNGR are discussed in the paper