Gamma and neutron dosimetry of Tehran Research Reactor containment during and after LOCA accident.

Abstract

The radiation effects of loss of coolant accident on the reactor operators are critical issues. In the present study, computational codes were used to investigate gamma and neutron dose rates inside the 5\u202fMW pool-type Tehran Research Reactor containment. The carried out calculations showed, when the remaining coolant over the core is decreasing less than 1\u202fm, the containment should be evacuated. In addition, 24\u202fh after LOCA, the containment gamma dose rates drop to one tenth of their initial values immediately after LOCA.