Steam generators of sodium cooled fast reactors

The basic classification of sodium-water steam generators by design is given, i.e., into body generators and modular (section) generators; the design of individual types is described and advantages and disadvantages listed. The individual systems differ also in operation, in the configuration of pipes and the design of the gas cushion. The basic demand put on all these steam generators is the protection of the system against the hazards of small or large sodium-water reactions. The structural criterion considered is the rupture of both walls of one pipe as the initial event; the growth of microleaks is also considered. The possibilities are given of leaks detection using chemical or physical processes arising during the sodium-water reaction. The criteria are listed for the selection of materials for steam generators, and the effects of corrosion related to the quality of feed water are considered. (J.P.)