Lower boiler shell integrated in the small rotary closure of a nuclear reactor closure

摘要

Lower boiler shell of a core closure 20 of a nuclear reactor having two - an upper and a lower - baseplates, through which the tubes of a tube wall 23, 31 pass and project at the bottom underneath the lower plate. ??According to the invention, these plates or tube walls 23, 31 are cambered and their concavity is directed upwards in order to limit the bending loads to a minimum value. The tube walls are joined on their circumference to the boiler shell by joining elements in the form of an inverted Y. ??The lower ends of the tube bundle are, furthermore, supported by a modular grate 60 formed from star-shaped elements having three arms (Fig. 1). IMAGE