UN GENERADOR DE VAPOR PARA UN REACTOR NUCLEAR DE AGUA PRESURIZADA

摘要

Slots (58) are provided in the wrapper (44) of a nuclear steam generator to increase the local flexibility of the wrapper (44) to allow for the difference in thermal expansion between the carbon steel wrapper (44) and the high corrosion resistant alloy tube support plates (42). The slots preferably cut by a high speed industrial laser, are very thin and do not permit substantial commingling of cooler downcomer water and the boiling mixture in the tube bundle region. The slots preferably have end portions which are curved away from one another to decrease stress concentrations and increase fatigue life.