Noise-analytic identification of the system sea/ship/reactor demonstrated by the example of NS OTTO HAHN

The study deals with the influence of the environmental parameter ''state of sea'' on the operation of a ship reactor. First of all, the available mockups and results obtained from mockups for the simulation of the input-output behaviour of the following subsystems 1) wind -> seas, 2) seas -> motion of the ship, 3) motion of the ship -> reactor output, 4) control rod position -> state of the reactor (neutron flux, fuel temperature, coolant pressure), 5) turbine -> actuated valve are patterned and extended - if necessary -, in order to enable the comparison with measuring results. For the model identification either autospectral analysis - for 1) and 2) - or frequency ranges, - for 3) to 5) are used; these were determined on-line and off-line with special instruments (e.g. with rangefinding wave height measuring buoys, sounding gyroscope and servo-assisted acceleration sensors, in-core sensors and process sensors, more amplifiers and noise filters, Fourier analysis). For the identification, the following methods turned out to be applicable: for 1) the adapted JONSWAP-spectrum, for 2) a rectlinear scanning method for minor rolling motion, for 3) the reactor manufacturer's conservative calculation, for 4) and 5) the reactor-dynamic programmes FREQUENCY and pressure of GKSS upon partial adaptation. (orig./HP)