[en] This report analyzes the supernate radionuclide dose impact in High Level Waste. The radionuclide ingestion and inhalation pathways are analyzed. This report analyzes spent fuel assemblies processed in the Separation facilities during the HM and PUREX campaigns and the current Safety Analysis Report (SAR) supernate radionuclide distribution. The individual radionuclide significance to dose is evaluated in terms of dose percentage. Comparing the radionuclide individual dose value allows the determination of those radionuclides whose dose impact is significant to the source term. Analysis of fission yield data and SAR source term values demonstrates that a limited number of radionuclides contribute 1% or more to the total dose and that cesium and plutonium isotopes are the radionuclides with major impact in the supernate source term. This report analyses both volatile and evaporative impact as recommended by DOE guidance. In reality, the only radionuclide volatilized during evaporative conditions is tritium. No evidence of selective volatility occurs during forced evaporation in HLW. The results obtained permit reducing the list of radionuclides to be considered in development of source terms to support the High Level Waste Safety Analysis Report