Abstract: A pressurized-water reactor with a core height of at least 3.5 m, is operated by using at least 50 measuring probes which are distributed throughout the core and which feed into a computer. The latter computes in advance a program of operation, by which individual control rods are adjusted, regardless of load changes, over the height of the core in such a manner that local power peaks are avoided.

Abstract: Limit regulation system for a pressurized water nuclear reactor in combination with a steam generating system connected to a turbine, the nuclear reactor having control rods as well as an operational regulation system and a protective system, includes reactor power limiting means operatively associated with the control rods for positioning the same and having response values between operating ranges of the operational regulation system, on the one hand, and response values of the protective system, on the other hand, and a live steam-minimal pressure regulation system cooperating with the reactor power limiting means and operatively connected to a steam inlet valve to the turbine for controlling the same.

Abstract: A nuclear reactor has a reactor core and is provided with means for determining the flux density in this core, including flux detectors located in the core at fixed positions and flux probes which are movable in the core through a range of positions. Means are provided for causing the movable flux probes to go into operation automatically when the fixed flux detectors are actuated by flux densities of predetermined values.