Estimation of radioactivity impact for RDE based on HTR-10 hypothetical accident - a case study

BATAN priority activity supported by the Center for Nuclear Reactor Technology and Safety is the conceptual design documents and evaluation of experimental power reactor (RDE). Based on the design established, the radiation safety involving the dispersion of radioactive into the site and environment shall be calculated. The objective of this study is to obtain the radioactivity impact of RDE due to hypothetical accident in Serpong II Nuclear Area (KNS-II) in Puspiptek Area. Postulated hypothetical accidents are water ingress and depressurization accident. The sourceterm input data taken are based on HTR-10 hypothetical accident. Meteorological and environmental data are taken from available data of KNS Serpong. The calculation is carried out using PC-Cosyma code. The highest radioactivity of air dispersion for Kr-87due to depressurization accident is 1.96E+04 Bq/m3 and due to water ingress accident is 1.96E+04 Bq/m3. The highest radioactivity of surface deposition due to depressurization accident for Cs-137 is 1.51E+03 Bq/m2 and due to water ingress accident for I-131 is 1.5E+01 Bq/m2. The impact of RDE radioactivity for hypothetical accidents on the KNS-II site shows lower than BAPETEN regulatory requirements.