Studies to the Stochastic Theory of the Coupled Reactor Kinetic-Thermohydraulic Systems. Pt. 4. An Effect of Temperature Feedback on Neutron Noise Field in PWRs

摘要

The effect of temperature feedback on the eigenvalues of the neutron noise components is examined by means of 1-D homogeneous reactor noise model. It is shown that at low frequencies (below 1-2 Hz) strong feedback effect influences the eigenvalue associated with the global component of the neutron noise, namely this 'global' eigenvalue splits into 3 parts. At the same time the eigenvalue associated with the 'local' component stays unaffected. Calculations were carried out with data typical for a PWR core. In appendix a more complicated model containing heterogeneous description of thermophysical process is described. The results can form a basis of interpretation of neutron response of PWRs especially in the low frequency region. (Atomindex citation 16:024622)