Improved algorithms -a system of modern methods for controlling the energy release of the core of a VVÉR-1000 reactor -are described. Experience in adopting the improved algorithms in the No. 2 unit of the Khmel'nitskii nuclear power plant is presented.Improved algorithms (I-algorithms) comprise a system of modern methods for controlling the energy release of a VVÉR-1000 core, including a new arrangement of groups of regulating organs and methods for moving them in the core, an improved procedure for monitoring the energy release in the core, modern methods for providing information to the operator, and the control algorithms themselves (the sequence of actions taken by the operator). The improved algorithms are adopted in the new units of a nuclear power plant in order to optimize reactor control taking account of the prospects for operating on a daily load schedule. The fundamental possibility of operating on a daily schedule was confirmed by tests, performed in 1998 on the No. 5 unit of the Zaporozh'e nuclear power plant [1]. But these same tests showed that reactor control must be improved. Such algorithms were adopted, in part, in the No. 1 unit of the Volgodonsk nuclear power plant in 2001 [2] and completely adopted in the No. 2 unit of the Khmel'nitskii nuclear power plant in 2004. Work is now being performed to adopt the algorithms in the No. 3 unit of the Kalinin nuclear power plant.In the present paper, the special features of the improved algorithms and certain aspects of their adoption into operation are examined for the No. 2 unit of the Khmel'nitskii nuclear power plant.Monitoring of the Energy Release. The three-dimensional energy release field in a core is represented by the matrixwhere j is the fuel assembly number; i is the number of the layer in the vertical direction (from the bottom of the core); w(i, j) is the energy release intensity in the cell (i, j) in the core; and w av is the average power intensity of the cells.

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