Features Events and Processes (FEPs) for Geologic Disposal of Radioactive Waste : An International Database Safety assessments of disposal sites for radioactive waste involve analyses of potential releases of radionuclides from the disposed waste and subsequent transport to the human environment. An important stage of assessment is the identification and documentation of all the features events and processes (FEPs) that may be relevant to long term safety. This report provides an international compilation of FEPs as well as a basis for selecting the FEPs that should be included in safety analyses.