REACTOR POWER CONTROL APPARATUS OF NATURAL CIRCULATION REACTOR, GENERATION SYSTEM OF NATURAL CIRCULATION REACTOR AND METHOD FOR CONTROLLING REACTOR POWER OF NATURAL CIRCULATION REACTOR

Abstract

In the present invention, a reactor power control apparatus of a natural circulation reactor comprises a power control apparatus for controlling reactor power and a pressure control apparatus for controlling reactor pressure. A power adjustment demand signal S4 is input from the power control apparatus into the pressure control apparatus. The pressure control apparatus controls degree of opening of a inlet port steam control valve provided in a moisture separation heater that is connected to a low-pressure turbine, based on the power adjustment demand signal S4.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a pattern diagram showing the overall structure of an embodiment of the reactor generation system having a natural circulation reactor of the present invention.

FIG. 2 is a block diagram showing the control system of the pressure control apparatus in the generation system of the natural circulation reactor shown in FIG. 1.

FIG. 3 is a block diagram showing a control system of another embodiment of the pressure control apparatus in the reactor generation system shown in FIG. 1.

FIG. 4 is a block diagram showing a control system of another embodiment of the pressure control apparatus in the reactor generation system shown in FIG. 1.

FIG. 5 is explanatory drawing showing the upper limit and the lower limit of the input load following demand signal.

FIG. 6 is explanatory drawing showing the relative change in the main parameters for the reactor generation system in which the power control apparatus of the natural circulation reactor of this invention is used.

FIG. 7 is explanatory drawing showing the time series changes in the reactor operation state.

Claims

1. A reactor power control apparatus of a natural circulation reactor comprising: a power control section for controlling reactor power; anda pressure control section for controlling reactor pressure, whereinsaid pressure control section inputs a power adjustment demand signal from said power control section, and controls degree of the opening of a inlet port steam control valve provided in a moisture separation heater that is connected to the low pressure turbine, based on said power adjustment demand signal.

2. The reactor power control apparatus of the natural circulation reactor according to claim 1, wherein any one of said pressure control section and said power control section inputs a load following demand signal from a center feeding.

3. The reactor power control apparatus of the natural circulation reactor according to claim 1, wherein said pressure control section controls degree of opening of a main steam control valve provided in a main steam pipe, in tandem with control of the degree of the opening of said inlet port steam control valve.

4. The reactor power control apparatus of the natural circulation reactor according to claim 1, wherein said pressure control section controls degree of opening of a turbine bypass valve provided in a turbine bypass pipe which branches from a main steam pipe, in tandem with control of the degree of the opening of said inlet port steam control valve.

5. The reactor power control apparatus of a natural circulation reactor according to claim 1, wherein said pressure control section controls degree of opening of a main steam control valve provided in a main steam pipe and degree of opening of a turbine bypass valve, in tandem with control of the degree of the opening of said inlet port steam control valve.

6. The reactor power control apparatus of a natural circulation reactor according to claim 1, wherein when the variation in the reactor power of the natural circulation reactor is transient, said pressure control section controls the degree of the opening of said inlet port steam control valve provided in a moisture separation heater based on said power adjustment demand signal.

7. The reactor power control apparatus of a natural circulation reactor according to claim 1, wherein the pressure control section has a gate portion, and when said power adjustment demand signal is greater than a preset threshold, a turbine bypass control valve is controlled so as to open, and when said power adjustment demand signal is smaller than said preset threshold, said inlet port steam control valve is controlled so as to close.

8. The reactor power control apparatus of a natural circulation reactor according to claim 2, wherein said pressure control section has a gate portion, and when said load following demand signal is greater than a preset threshold, a turbine bypass control valve is controlled so as to open, and when said load following demand signal is smaller than said preset threshold, said inlet port steam control valve is controlled so as to close.

9. The reactor power control apparatus of a natural circulation reactor according to claim 1, wherein said power control section inputs reactor power equivalent signal from said pressure control section, and controls a control rod drive apparatus that is connected with a control rod based on said reactor power equivalent signal.

10. The reactor power control apparatus of a natural circulation reactor according to claim 2, wherein said pressure control section controls degree of opening of a main steam control valve provided in a main steam pipe, in tandem with control of the degree of the opening of the inlet port steam control valve when said load following demand signal has a narrow range and a short period.

11. The reactor power control apparatus of a natural circulation reactor according to claim 2, wherein said pressure control section controls degree of opening of a main steam control valve provided in a main steam pipe, in tandem with control of the degree of the opening of said inlet port steam control valve when the reactor pressure signal input from a pressure detection apparatus provided to the reactor pressure vessel has a narrow range and a short period.

12. A generation system comprising: a natural circulation reactor which generates steam by naturally circulating coolant internally:a turbine which rotates due to the steam generated in said reactor: anda reactor power control apparatus which controls the power of the natural circulation reactor,wherein said reactor power control apparatus comprises a power control section which controls the reactor power and a pressure control section which controls the reactor pressure; andsaid pressure control section inputs a power adjustment demand signal from said power control section, and controls degree of opening of a inlet port steam control valve provided in a moisture separation heater based on said power adjustment demand signal.

13. A method for controlling reactor power a natural circulation reactor comprising: a power control section which controls the reactor power: anda pressure control section which controls the reactor pressure,wherein when any one of a load following demand signal and a power adjustment demand signal is input to said pressure control section, said pressure control section controls degree of opening of a main steam control valve provided in a main steam pipe, in tandem with control of degree of opening of a inlet port steam control valve connected to a low-pressure turbine, and when the reactor power equivalent signal is input into said power control section, said power control section controls a control rod drive apparatus connected with a control rod in order to operate said control rod.