[en] The Lawrence Livermore Laboratory has been providing technical support to the Nuclear Regulatory Commission in the development of regulations, regulatory guides, and branch technical positions for the management of nuclear wastes. Studies of solidified high-level waste during the period from 1976 to 1978, when work was terminated because of shifting of national emphasis onto spent fuel disposal, are presented in this report. The problem of management, i.e., handling, generation, and disposal of solidified high-level waste derived from operation of commercial light-water reactors, requires a thorough systematic solution to protect health and ensure safety. A definition of the problem by describing the components of the waste management system is given: the waste form, the containers, storage and transportation appurtenances, handling equipment, the repository surface and underground facilities, the repository site, and the operations. A systems analysis methodology to assess the hazards of waste management is developed. Data on accident probabilities, waste form characteristics, and geological and hydrological properties of potential repository sites are compiled. A wide range of management scenarios are generated. Limited sensitivity and uncertainty analyses are performed. On the basis of available information, preliminary investigations showed that transportation and interim storage are of most concern. Also identified are areas needing further study: transportation data base, thermal and seismic aspects of interim storage, human factors, geochemical transport of radionuclides, and ground water composition, among others. In addition to the technical solution of the problems, brief consideration to historical and socioeconomic aspects is also given