Development of a large scale PWR with hybrid safety systems

As described in this paper, it has been confirmed that the Hybrid Safety System can be applied for large scale PWR plant. This is because SG cooling system has been adopted as a passive decay heat removal purpose and did not use large or high pressure components for this purpose. By using the Hybrid Safety Systems, which include the new passive safety systems, the design has been significantly simplified, the reliability has been improved and the plant has became more economical. The conceptual designs have already been completed and the basic design work is now in progress. Efforts will be made to further improve the design, so that it can be applied to next generation of PWR plants. (author)