Development of JOYO MK-II core characteristics database

The experimental fast reactor JOYO served as the MK-II irradiation bed core for testing fuel and material for FBR development for 15 years from 1982 to 1997. During the MK-II operation, extensive data were accumulated from the core characteristics tests conducted in thirty-one duty operations and thirteen special test operations. These core management data and core characteristics data were compiled into a database. The core management data include specifications and configurations of the core, atomic number density before and after irradiation, neutron flux, neutron fluence, fuel burn-up, and temperature and power distributions. Core characteristics data include excess reactivities, control rod worths, and reactivity coefficients,e.g., temperature, power and burn-up. These data were recorded on CD-ROM for user convenience. (author)