Method for controlling a pressurized water reactor, computer program product and control system

21:

• The method according to claim 20, further comprising:
• receiving a planned electric power change for a predetermined time, wherein the calculation of the future axial offsets, AO, for a plurality of different possible boration/dilution actions at the end of the predetermined prediction time interval is further based on the planned electric power change during predetermined prediction time interval.

25:

• The method according to claim 20, wherein the non-measurable reactor variables are obtained by a reactor co-simulator.

26:

• The method according to claim 20, wherein the boration/dilution action to be performed is determined based on an interpolation between at least two points created by pairs of boration/dilution value and the calculated future axial offset.

27:

• The method according to claim 26, wherein a boration/dilution value for a boration/dilution action to be performed is selected from the interpolation such that the difference between the axial offset and the corresponding reference axial offset is zero.

28:

• The method according to claim 26, wherein a boration/dilution value for a boration/dilution action to be performed is selected from the interpolation such that the difference between the axial offset and the corresponding reference axial offset is zero when the corresponding reference axial offsets are equal.

29:

• The method according to claim 20, wherein the boration/dilution action to be performed is determined based on an interpolation between at least two points created by pairs of boration/dilution value and the difference between the calculated future axial offset and the corresponding reference axial offset.

30:

• The method according to claim 29, wherein a boration/dilution value for a boration/dilution action to be performed is selected where an interpolation curve of the interpolation presents a zero-crossing in a dimension representing the difference between the axial offsets and the corresponding reference axial offset.

31:

• The method according to claim 26, wherein the boration/dilution action to be performed is determined based on an interpolation between two neighboring points giving a smallest negative difference between the future axial offset and the corresponding reference axial offset and a smallest positive difference between a future axial offset and the corresponding reference axial offset.

32:

• The method according to claim 29, wherein the boration/dilution action to be performed is determined based on an interpolation between two neighboring points giving a smallest negative difference between the future axial offset and the corresponding reference axial offset and a smallest positive difference between a future axial offset and the corresponding reference axial offset.

33:

• The method according to claim 20, wherein the boration/dilution action to be performed is determined by selecting a boration/dilution action from the plurality of different possible boration/dilution actions, which leads to a smallest absolute difference between the respective future axial offset and the corresponding reference axial offset.

34:

• The method according to claim 20, wherein each calculation of a future axial offset at the end of predetermined time span for a plurality of different possible boration/dilution actions is based on the same reactor process variables except the boration/dilution action.

35:

• The method according to claim 20, wherein the predetermined prediction time interval is between 5 and 15 minutes.

36:

• The method according to claim 20, wherein the calculation of the future axial offsets at the end of a predetermined prediction time interval for a plurality of different possible boration/dilution actions is based on numerical solving of integral equations.

37:

• The method according to claim 20, wherein the calculation of the future axial offsets at the end of a predetermined prediction time interval for a plurality of different possible boration/dilution actions is based on numerical solving of integral equations based on reactivity balance equations.

38:

• The method according to claim 20, wherein the corresponding reference axial offset is respectively a reference axial offset at the end of the prediction time interval calculated for each possible boration/dilution action based on the reactor power and/or positions of power control rods at the end of the prediction time interval.

39:

• The method according to claim 20,
• wherein the corresponding reference axial offsets are equal for each possible boration/dilution action,
• wherein the corresponding reference axial offset is based on a measurement.

40:

• A computer program or FPGA configware product comprising:
• commands for executing the method according to claim 20 when loaded and executed on a processor or on a FPGA.

41:

• A computer-readable data carrier having stored thereon the computer program or FPGA configware product of claim 40.

42:

• A data carrier signal carrying the computer program or FPGA configware product according to claim 40.