초록 ▼

A retaining device has a multi-layer protective cladding for protecting the bearing and containment structure of a spreading chamber for the controlled spread and cooling of a melt from a nuclear reactor pressure vessel. The spreading chamber is configured under the spreading concept, i.e. the melt

A retaining device has a multi-layer protective cladding for protecting the bearing and containment structure of a spreading chamber for the controlled spread and cooling of a melt from a nuclear reactor pressure vessel. The spreading chamber is configured under the spreading concept, i.e. the melt spreads and cools therein. The protective cladding has at least two layers: an outer sacrificial layer acts as a thermal shock barrier and melting substance; a protective and insulating layer, disposed inside the sacrificial layer and protecting the underlying bearing and containment structure, acts as thermal protection layer and retaining layer for the hot melt. The protective and insulating layer includes a first partial layer of fireproof concrete adjacent the bearing and containment structure, and a second partial layer of temperature-resistant ceramic blocks, in particular ZrO.sub.2 adjacent the sacrificial layer.

대표청구항 ▼

[ We claim:] [1.] In combination with a water-cooled nuclear reactor installation having a pressure vessel and a space below the pressure vessel for receiving a core melt in the case of a core meltdown, the space below the pressure vessel having a given area, a retaining device comprising:a spreadin

[ We claim:] [1.] In combination with a water-cooled nuclear reactor installation having a pressure vessel and a space below the pressure vessel for receiving a core melt in the case of a core meltdown, the space below the pressure vessel having a given area, a retaining device comprising:a spreading chamber disposed laterally offset from the space below the pressure vessel and lower than the space below the pressure vessel and having a spreading area larger than the given area of the space below the pressure vessel for spreading the core melt over said spreading area and for cooling the core melt;an obliquely inclined conduit connecting the space below the pressure vessel with said spreading chamber;said spreading chamber having a bearing and containment structure;a protective layer disposed upwardly adjacent on and protecting said bearing and containment structure of said spreading chamber;an outer sacrificial layer disposed upwardly adjacent on said protective layer, said outer sacrificial layer being melted when in contact with the core melt and cooling the core melt; anda cooling system for a delayed supplying of a coolant having temperature-dependently opening feed channels integrated in said outer sacrificial layer, for supplying the coolant to the core melt when said temperature-dependently opening feed channels get in contact with the core melt.