Apparatus and method for closed loop control of reactor power

Details Apparatus and method for closed loop control of reactor power Apparatus and method for closed loop control of reactor power

G - Physics

21

C

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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