Induced activity of 60Co in the reactor core structural components as a function of irradiation time: 1 – lower end parts of beryllium blocks; 2 – upper support plate; 3 – vessel between elevations of -200 and 200 from the core mid position; 4 – vessel outside elevations of -200 and 200 from the core mid position; 5 – lower end parts of beryllium blocks; 6 – bottom shell.