On the use of LOADF code for optimisation of the Krsko Power Plant operation

The LOADF package has been designed for on-line reactor core monitoring of the Krsko NPP and for off-line prediction-mode calculations. Special features of the code are axial offset trajectory plots in which the axial offset difference between power and xenon is plotted versus the difference between the axial offsets of iodine and xenon. The trajectories are elliptic tilted spirals, which can be parameterised. They measure the deviation from steady state condition with respect to xenon transients and can be used to predict the axial offset trends under transient conditions. An application of the axial offset trajectory diagram is described on the example of a power reduction transient.(author)