Integrated design of prestressed cast-iron pressure vessel and passive heat removal system for the reactor cell of a 200 mwth modular reactor

For a modular reactor of 200 MW thermal output a prestressed cast iron pressure vessel with the surrounding reactor cell has been designed. Integrated in the cast iron profiles of the reactor cell is a redundant water cooling system based on natural convection. Air cooled cooling towers are provided to cool the water down to ambient temperature. The cooling system covers a wide range of possible wall temperatures without significant changes in water temperature. The structures of the reactor pressure vessel and the cell, their assembly, and some results of the engineering work done up to now are described.