This document discusses nuclear waste disposal and provides background information on radioactive waste. It defines radioactive waste as any material that is radioactive or contaminated by radioactivity and for which no further use is envisaged. The document categorizes radioactive waste as high-level waste, intermediate-level waste, or low-level waste depending on the level of radioactivity and heat generation. It outlines fundamental principles of radioactive waste management, including preventing waste generation where possible, characterizing and segregating waste, storing it safely, and processing it into a passively safe state.