Distributed Hmi System for Managing All Span of Plant Control and Maintenance

These days, the extension of reactor operation periods and plant life extension is the worldwide trend for efficient and economical operation of nuclear power plants. Plant maintenance methods have been changing from the traditional time-based maintenance (TBM) or periodical shutdown maintenance (where reactor operation is stopped and all the equipment is checked, disassembled, tested, and assembled again or exchanged in accordance with the prescribed procedure) to condition based maintenance (CBM) or risk informed maintenance [1]. In the case of CBM, online condition monitoring methods are positively used during power operation; that is, all the important equipment is continuously or intermittently monitored during plant operation to check their status and predict their future trend to judge whether or not it is necessary to conduct maintenance work during the next reactor shutdown period. In the US, even online maintenance of failed equipment is conducted. In order to cope with this new requirement it will be necessary to develop a new method of human-machine collaboration by applying new ICT for developing intelligent monitoring system which will help humans to monitor all equipment, diagnose equipment state, and conduct complex planning analysis for both operation and maintenance of nuclear power plants. 1.2 Next Generation Human Machine System Project