| 摘要 |
A boiling-water nuclear reactor is equipped with a control system for control rods (8), which upon occurrence of a fault permits automatic shutdown of the reactor, the system operating completely independently of a power supply coming from outside the reactor. The control rods (8) are arranged to move freely in channels. These channels are connected at the bottom to a distributor chamber filled with water, and are connected to the surrounding reactor space through openings in their upper part. The reactor is provided with a pump, which generates an overpressure in the distributor chamber with respect to the surrounding space. Owing to this overpressure, a retaining force is created which is capable of holding the control rod (8) in a position outside the reactor core. The control rod channels are connected via control lines to actuating devices through which pulses for varying the control rod position can be generated. <IMAGE> |
