Abstract
Power Unit This work is devoted to the development of automated control models and methods of power change at WWER-1000 power unit to provide the most stable axial offset in the load-following mode. Improved multi-zone mathematical model of WWER1000 allows taking into account the energy release of 235U nuclei fission as well as 239Pu and includes a sub-model with distributed parameters. The automated control method of power change at WWER-1000 power unit that uses three control loops was proposed for the first time. The first loop maintains change of reactor power by controlling the boric acid concentration in the primary coolant. The second control loop maintains the required value of axial offset by controlling the position of 9th group control rods, and the third one maintains coolant temperature mode or steam pressure mode by controlling the main valve positions in the turbine generator.
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