| 摘要 |
In the water-cooled nuclear reactor, the vertically arranged control rods (50) pass through the outlet plenum (26) into the fission chamber (12), these control rods being surrounded by thimbles. A major portion of the cooling water flow is fed directly to the floor of the fission chamber (12), so that flow through the latter takes place in an upwards direction. A small portion pressurises a space (72) in the upper part of the tank and flows downwards through the rod thimbles and thus reaches the major portion of the cooling water flow in the lower part of the fission chamber. The result is to provide a cooling arrangement in which the control rod cooling is less critical with respect to the flow control and the performance in the case of an emergency shutdown of the reactor. <IMAGE> |
