Journal article Open Access

FEATURE EXTRACTION AND IDENTIFICATION TECHNIQUES FOR THE ALIGNMENT OF PERTURBATION SIMULATIONS WITH POWER PLANT MEASUREMENTS

George Ioannou; Thanos Tasakos; Antonios Mylonakis; Georgios Alexandridis; Christophe Demazière; Paolo Vinai; Andreas Stafylopatis

In this work, a methodology is proposed for the comparison of the measured and simulated
neutron noise signals in nuclear power plants, with the simulation sets having been
generated by the CORE SIM+ diffusion-based reactor noise simulator. More specifically,
the method relies on the computation of the Cross-Power Spectral Density of the detector
signals and the subsequent comparison with their simulated counterparts, which involves
specific frequency values corresponding to the signals’ high energy content. The different
simulated perturbations considered are (i) axially traveling perturbations, (ii) fuel assembly
vibrations, (iii) core barrel vibrations, and finally (iv) generic “absorber of variable
strength” types. The reactor core used for the current study is a German 4-loop pre-Konvoi
Pressurized Water Reactor.

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