Abstract
The reactivity effectiveness of a control rod is estimated for the high flux reactor in Petten at automatic full-power operation shortly after startup. Transient noise processes arising largely from fission-product poisoning are fully utilized to arrive at estimates of the control-rod effectiveness defined as the covariance-to-variance ratio for neutron noise and fine-rod's successive movements. The physical meaning of the effectiveness is explained in terms of a reactivity balance associated with control and feedback reactivity. A time-domain noise analysis for many small pieces of transient data is performed to obtain useful information about the time-varying properties of the system such as, for example, a gradual change in fine-reactivity adjustments from frequent regulation to smoother control. Application to the Borssele PWR has also been made to show steady effectiveness of a control rod bank during 13 hours after start-up at full-power.
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