| 摘要 |
PCT No. PCT/FR88/00293 Sec. 371 Date Feb. 6, 1989 Sec. 102(e) Date Feb. 6, 1989 PCT Filed Jun. 9, 1988 PCT Pub. No. WO88/09998 PCT Pub. Date Dec. 15, 1988.An arrangement is disclosed for preventing the molten corium of a nuclear reactor from penetrating into the ground. The reactor is supported by a concrete raft bearing on the ground, and inserted in the raft is a retaining basin having an upper portion of refractory material which is chemically inert towards the constituents of the corium oriented toward the corium, and a lower portion made of a refractory material with a heat conductivity much greater than that of the upper portion. Generally the upper layer of the retaining basin will be made of zirconia and the lower layer will be made of graphite. Disposed between the reactor and the retaining basin is a means for deflecting the vertical attack of corium on the basin and spreading out the corium, comprising a plurality of concentric cavities, each successive cavity having a greater outer diameter than that of the preceding cavity and having a center located at a greater vertical distance from the reactor than the preceding cavity.
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