Core melt-through retention device for light-water reactors

Induced nuclear reactions: processes – systems – and elements – Reactor protection or damage prevention – Core catchers

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G21C 9016

Patent

active

053496159

ABSTRACT:
The device (4) for the retention of core melt-through in light-water reactors by means of a crucible (40) disposed beneath the reactor pressure vessel (2) comprising of a vat (41) and a plurality of sack-like protuberances (42) on its underside and also of a metal lid (43). The lid forms a water-tight upper seal for the crucible and has a reinforcement (43b) to absorb the kinetic energy of the impact of the core melt-through. The crucible consists of a metal wall (40a), which is lined with a ceramic material (40b)--preferably made from high-temperature isostatic pressed boron nitride. The device (4) is disposed in a water-filled cooling basin (32), which forms the lowest part of the containment sump and which can be constructed as a cavity in the containment foundation. The water vaporized during cooling if the requirements are met condenses on the walls of the containment and flows back into the containment sump.

REFERENCES:
patent: 4073682 (1978-02-01), Barleon et al.
patent: 4464333 (1984-08-01), Wohlsen
patent: 5057271 (1991-10-01), Turricchia
patent: 5263066 (1993-11-01), Szabo et al.

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