The present stage of development of nuclear power plants with helium turbine and high temperature reactor is reported and a description given of the first plant of this type, the Geesthacht KSH plant (Kernkraftwerk Schleswig-Holstein) in Germany. Particular stress is laid on the control of closed-cycle gas turbines. The special cases of reactor scram, shutdown of the turbine and load release as well as starting up and turning off of the plants are taken into consideration. The design of the turboset and the arrangement of the components of helium turbines of high output are described. Furthermore results of calculations for optimum layout of helium turbine plants with regard to simultaneous power and process heat generation are given.

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