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 1310767

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 concentration of a soluble neutron absorber (chemical shim) for altering the nuclear reactor power level. A computer computes at short time intervals the two functions [.rho.(t) - ¦~c¦/.lambda.'e(t)]¦~c¦ and .tau.(t)ln(P F/P(t)). The direction of motion of the control element is altered when these two functions 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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