Radiation Dose Rates from UO2-PuO2 Thermal Reactor Fuels

Gamma and neutron radiation dose rates from various experimental fuel assemblies and from full-size commercial BWR and PWR power reactor fuel assemblies containing UO2-PuO2 fuel with high exposure plutonium were measured. Maximum gamma and neutron dose rates encountered at 61-cm distance from the surfaces of the fuel assemblies were 6.5 mR/h and 25 mrem/h, respectively. It is concluded that commercial reactor operators can handle fuel assemblies containing high exposure plutonium without excessive personnel exposure and with a minimum of special handling procedures. However, radiation shielding for some fuel fabrication steps will be necessary with plutonium of the type expected to become available during the late 1970s.