The article discusses the arrangements made for storage of intermediate-level waste (ILW) at Sellafield, England, a nuclear reprocessing site, and forecasts the challenges and opportunities for the future storage of ILW. Topics discussed include source of ILW at Sellafied including fuel element cladding, solids recovered from liquid effluent, and development work in laboratories, forecasting of waste arisings at Sellafield, and storage methodology of ILW including charge floor design.