Аннотация:Nuclear energy is clean, reliable and competitive with many useful applications, among which
power generation is the most important because it can gradually replace fossil fuels and avoid
massive pollution of the environment. Nuclear waste is a useless by-product resulting from the
utilization of nuclear energy in both power generation and other applications such as in medicine,
industry, agriculture, and research. Safe and effective management of nuclear waste is crucial to
ensure the sustainable utilization of nuclear energy. Nuclear waste must be processed to make it
safe for storage, transportation, and final disposal, which includes its conditioning; accordingly, it is
immobilized and packaged before storage and disposal. The immobilization of waste radionuclides
in durable wasteform materials provides the most important barrier to contribute to the overall
performance of any storage and/or disposal system. Materials for nuclear waste immobilization are
thus at the core of multibarrier systems of isolation of radioactive waste from the environment aimed
to ensure the long-term safety of nuclear waste storage and disposal. This Special Issue analyzes
the materials currently used, as well as novel materials for nuclear waste immobilization, including
technological approaches utilized in nuclear waste conditioning that attempt to ensure the efficiency
and long-term safety of storage and disposal systems. It focuses on the advanced cementitious
materials, geopolymers, glasses, glass composite materials, and ceramics developed and used in
nuclear waste immobilization, with the performance of such materials being considered of the utmost
importance.