[en] The overall radioactivities of fission products depending on irradiation time and cooling time were calculated for 18 different neutron fluxes, which are presented in contour maps and tables. Irradiation condition etc. are the followings: neutron flux (n sub(th)) 1 x 10¹² - 6.8 x 10¹⁴ n/cm²/sec, uranium quantity 1 mole (6 x 10²³ atoms, ca. 271 g UO₂), U-235 enrichment 2.7%, irradiation time 60. - 6 x 10⁷ sec (1 min - 1.9 y), cooling time 0. and 60. - 6 x 10⁷ sec (1 min - 1.9 y). The enrichment value represents those for LWRs. To calculate the overall radioactivities, 595 fission product nuclides were introduced. Overall radioactivities calculations were made for 68,000 combinations of irradiation time, cooling time and neutron flux. The many complex decay chains of fission products were treated with CODAC-No.6 computer code. (author)