In-core Flux Mapping System Retrofit for Kori Unit 2

In-core flux mapping system acquires 3-dimensional neutron flux distribution data into the nuclear reactor. This system, generally observed in the Westinghouse designed plants, is comprised of movable detectors, a detector drive system and a control console. As system equipment is getting order in most plants of the type, trouble occurs frequently during the operation and most spare parts for maintenance would be out of stock in the near future. So, the system retrofit project for Kori unit 2 in order to remedy the increasing defect had been performed. This paper presents overall description of the project achievement. An advanced detector drive system and a control console were designed, built and tested. The system was installed and test-operated during the 19th plant outage of Kori unit 2 in 2004