Analytisches Modell zur Berechnung der Übertragungsfunkionen für das Neutronenflußrauschen in WWR-440 Reaktoren bei stochastischen Schwingungen der Regelelementunterteile


Analytisches Modell zur Berechnung der Übertragungsfunkionen für das Neutronenflußrauschen in WWR-440 Reaktoren bei stochastischen Schwingungen der Regelelementunterteile

Meyer, K.; Hollstein, F.

Control elements of VVER-440 type reactors consist of absorber and fuel parts. They can approximately be considered as spatial double pendulums. The length of both parts is equal to the height of the core. In the present paper the main interest is directed to the neutron noise due to random vibrations of the fuel parts (lower parts of the pendulums). It is assumed, that the fuel parts of all control elements are completely inserted into the core. A homogeneous cylindrical reactor model is used to describe the neutron flux. It is also assumed, that the control elements can be excited to flow induced random 3D transverse oscillations and pendulum motions. The transfer functions for the considered two kinds of control element motions were calculated by means of the Prompt-Response-Approximation for the Modified-One-Group-Diffusion-Equation. Using numerical results, studies have been made to clear up the contribution of the random pendulum motions to the neutron noise.

  • Open Access Logo Forschungszentrum Rossendorf; FZR-205
    ISSN: 1436-3976

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Publ.-Id: 1077