| 摘要 |
<p>1,166,004. Reactor pressure vessels. STONE & WEBSTER ENG. CORP. 31 Jan., 1968 [21 March, 1967], No. 5035/68. Heading G6C. In a pressurized-water nuclear reactor, the reactor and the associated steam generating heat exchangers are housed within a containment structure provided with a pressure suppression system which operates during a nuclear accident. An external concrete biological shield surrounds the containment structure. The reactor vessel 11, Fig. 1, is disposed within the containment shell 10 together with the steam generators 12. The shell 10 has a hemispherical dome 10a and vertical compartments 14 containing the generators 12. A cylindrical steel tank 19 surrounds 10 and is embedded in concrete biological shield 23. The gravel, sand or rough concrete 25 surrounds 10. Duct 28 is closed by a relief valve rupture disc 31 and filter 32 and opens in 25. An accident within 10, causing a rise in pressure, ruptures disc 31 and releases gaseous explosion products to the porous mass 25. The escape of explosion products through a fracture in 10 is similarly reduced by 25. In Fig. 2, the pressure suppression is effected in the torus chamber 50 having condensing liquid 56 and inlet pipes 54. In further embodiments, a double containment shell is provided and a water shield may be disposed above the concrete.</p> |
