| 摘要 |
Dual-cycle nuclear reactors are known as pressurised water reactors as very reliable energy installations. Their advantage resides in that in the event of overheating the light water, acting as coolant and moderator at the same time, drastically reduces the production of the thermal neutrons required for the nuclear fission and that owing to this self-balancing the reactor cannot run away. Further risks are posed by terrorism, aircraft crashes, earthquakes and effects of war. In addition, in order to avoid the escape of radioactive fission products due to overheating, it is necessary for the emergency cooling of the fuel rods always to be ensured. A heretofore conventional mechanical recirculating pump is not absolutely reliable. All the risks are eliminated due to the fact that the reactor is arranged so deep below the surface of the earth that, on the one hand, it is no longer accessible and, on the other hand, gravity and the natural recirculation bound up therewith guarantees cooling of the fuel rods at any time. Retrofitting of existing pressurised water reactors can be done without difficulty.
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