Konstruktion und Berechnung eines vorgespannten Druckbehaelters mit internem Corecatcher fuer Druckwasserreaktoren

This study outlines a prestressed reactor pressure vessel, with integrated core-catching device, whose principal design characteristics are essentially oriented to the requirements of a 1300 MW_e_1 Konvoi pressurised water reactor. On the one hand, this type of core meltdown is retained in a relatively limited volume, in the course of which a reaction with water entering from the outside is repressed. On the other hand the selection is permitted of a prestressed reactor pressure vessel which is far greater than the size of conventional steel pressure vessels and, in addition, avoids accident sequences deriving from the spontaneous integral failure of the steel pressure vessel (bursting). The special feature of prestressed vessels is the devolution of various subfunctions to the individual vessel components. By the separation into supporting, bearing and sealing functions, the individual components can be optimised according to their specific requirements. In none of the structural components and loading cases investigated have impermissible stress values been achieved or even exeeded. The tensile stresses in the vessel components lie markedly under those of conventional vessel and, as the stress calculation show, only occur in small ranges. The separation of the prestressed reactor pressure vessel from core retention device via a so-called grider which permits the retention device to be braced separately from the vessel. A changing of the vertical fissure geometry into a broad upper inflow fissure and a narrower bottom fissure favours heat dissipation in the assumed core meltdown accident, in which a separation into metallic and oxidic phases is to be pressumed. In none of the suggested core meltdown scenarios is the load-bearing capacity of the casting material of the internal core-catcher exceeded. (orig.)Available from TIB Hannover: RA 831(3511) / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekSIGLEDEGerman