Apparatus and method for closed loop control of reactor power

G - Physics – 21 – C

Patent

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359/27

G21C 7/36 (2006.01)

Patent

CA 1251580

ABSTRACT OF THE DISCLOSURE Closed-loop controller for altering the power level of nuclear reactors in a safe manner and without overshoot. Apparatus is provided for moving a control element such as a control rod or for adjusting the con- centration of a soluble neutron absorber (chemical shim) for altering the nuclear reactor power level. A computer computes at short time intervals the two functions [p-¦p¦/.lambda.e]/¦p¦ and ?iln(PF/Pi). The direction of motion of the control element is altered when these two fun- ctions become equal thereby resulting in the attainment of a new power level without overshoot. In a preferred embodiment, these two functions are computed at intervals of approximately one second.

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