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Naval nuclear reactors are a major source of power and energy. Energy from a reactor can be harvested into an energy storage system, namely electrochemical (e.g., batteries, fuel cells), that can be u... Naval nuclear reactors are a major source of power and energy. Energy from a reactor can be harvested into an energy storage system, namely electrochemical (e.g., batteries, fuel cells), that can be used for purposes other than for providing emergency power. The Naval Nuclear Laboratory is issuing a request to evaluate energy storage system concepts that would interface with naval nuclear reactors. Proposals shall: Target the storage systems being capable of recharging battery and fuel cell systems with usable energy contents of 100, 1000, and 10,000 kW-hrs; Determine the fastest rates at which the storage systems can recharge batteries and fuel cells, and itself be recharged by the nuclear reactor (pressurized water reactor); Identify key parameters that can significantly impact recharge rates; Determine the smallest footprints for the energy storage systems capable of providing the requisite energies; Determine the smallest displacements (weights) for the energy storage systems capable of providing the requisite energies; Identify technologies that can reduce energy storage system footprints and displacements; Identify safety issues with the various concepts and methods to mitigate hazards. Update 4/6/2021: Updated Request for Proposal document (Rev. 1) correcting contact information for FMP-NNL-006.