| 摘要 |
Generating low-temp. heat, esp. for district heating systems, from a nuclear reactor, immersed in a water basin and having a prim. cooling system thermally sepd. from the rest of the basin water, is described. Natural convection forces the cooling water to ascend from the reactor through a vertical duct, where the decreasing pressure causes formation of steam; the steam is sepd. at the top of this duct, condenses and gives up its heat content to a heat exchanger, where it heats up a sec. circuit, where again boiling and condensation take place. In the prim. circuit, the condensate and water are mixed, collected in a basin and fed back to the plenum below the reactor. The difference in the specific gravities in the ascending pipe and in the descending pipe are such that natural circulation is maintained in the reactor cooling circuit. The pressure between the prim. cooling system and the water basin is balanced at the level of the condensate collecting basin. In the prim. circuit, below this level and down to the plenum below the reactor, the hydrostatic pressure continually increases, whereas above this level the constant condensn. pressure obtains, the level of the basin water can move freely relative to that in the condenser vapour chamber.
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