| 摘要 |
1294087 Moderator structures NUCLEAR POWER GROUP Ltd 7 Nov 1969 [8 Nov 1968] 53102/68 Heading G6C In a gas cooled nuclear reactor, the moderator is formed of graphite blocks, 1, cooled by gas flowing downwards through the passages, 6, to the spaces, 8, formed in the blocks 2. The spaces, 8, are interconnected and the gas leaves through duct, 9. Radiation in duct 9 is reduced by radiation shielding 10, e.g. steel, on the blocks adjacent to 9. A steel neutron shield, 14, is interposed between the blocks 1 and 2 and the blocks, 3, limit the flow of gas from 8 between the blocks 4. To maintain the core upper surface level the blocks rest on the spherical seats, 13, which counteract floor irregularities. In an alternative form, the blocks, 2, may be replaced by metal tubes which have external thermal insulating sleeves and are cooled internally by a gas flow. |
