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Abstract: The ENHS thermal hydraulic optimization code was modified and applied to search for the maximum attainable power from a wide range of ENHS design options subjected to the following constraints: maximum permissible hot channel coolant outlet temperature of 600°C, clad inner temperature of 650°C and primary coolant temperature rise of either 150°C or 90% of the theoretical limit for accelerated corrosion rate. The T–H optimization variables include the intermediate heat exchanger number of channels, channel width and elevation; diameter of the riser and diameter of a flow-splitting shroud in the riser. It was found possible to increase the attainable power from the nominal 125MWth up to 311MWth for the reference core, 400MWth for a reference-like core having equilibrium composition fuel and 372MWth for a flattened power core with 9 plutonium concentration zones. A power level exceeding 400MWth may be achieved by flattening the power distribution of the equilibrium core or using nitride fuel with enriched nitrogen rather than metallic fuel. With forced circulation it is possible to operate the flattened power core at up to 532MWth corresponding to 223MWe. [Copyright &y& Elsevier]