Thermal Energy Released in Fission of ²³²Th, ²³³U, ²³⁸Pu, ²⁴⁰Pu, ²⁴²Pu, ²⁴¹Am, ²⁴²Cm, ²⁴³Cm and ²⁴⁴Cm

In the nuclear reactor design, the precise calculation of thermal fission energy is of great significance. In the pressurized water reactor, high energy neutron-induced fission rarely occurs, the isotopes including ²³³U, ²⁴¹Am and ²⁴³Cm are mostly induced by thermal neutrons, while the other isotopes such as ²³²Th, ²³⁸Pu, ²⁴⁰Pu, ²⁴²Pu, ²⁴²Cm and ²⁴⁴Cm are by fast neutron. In order to carry out this work, the nuclear data extracted from the latest evaluated nuclear data file (ENDF/B-Ⅶ) were adopted, and the energy-conservation law for the calculation of total fission energy were used, meanwhile, with the consideration of capture energy and the correction of β and γ, the thermal fission energy of nine isotopes was obtained. Compared with the data excerpted from IAEA issued WIMS-D database, the results are reasonable. The thermal fission energy and its uncertainties of the nine isotopes are: (193.939±0.176) MeV for ²³²Th, (200.063±0.084) MeV for ²³³U, (208.786±1.133) MeV for ²³⁸Pu, (211.266±0.220) MeV for ²⁴⁰Pu, (213.862±0.299) MeV for ²⁴²Pu, (215.077±0.210) MeV for ²⁴¹Am, (218.821±0.159) MeV for ²⁴²Cm, (218.525±0.388) MeV for ²⁴³Cm, and (220.067±0.131) MeV for ²⁴⁴Cm, respectively.