Patent ID: 9558856
Date: 2017-01-31
CPC Classifications: G21C,G21D,Y02E

Claim:
1. A control system for a nuclear power plant, the nuclear power plant including a nuclear reactor cooling system including a nuclear reactor and a turbine system performing heat exchange with the nuclear reactor cooling system, comprising: a first digital control device including a first programmable processor configured to perform a first feed water control function, a first main steam relief valve control function, a pressurizer interlock function, a main feed water pump speed control function, and a second main steam relief valve interlock function; a second digital control device including a second programmable processor configured to perform a second feed water control function, a second main steam relief valve control function, a pressurizer pressure control function, and a third main steam relief valve interlock function; a third digital control device including a third programmable processor configured to perform a third feed water control function, a third main steam relief valve control function, a pressurizer water level control function, and a fourth main steam relief valve interlock function; a fourth digital control device including a fourth programmable processor configured to perform a fourth feed water control function, a fourth main steam relief valve control function, a control rod shutdown margin monitor function, and a first main steam relief valve interlock function; a fifth digital control device including a fifth programmable processor configured to perform a turbine bypass control function, a control rod interlock function and a boron concentration control function; and a sixth digital control device including a sixth programmable processor configured to perform a control rod driving control function and a turbine bypass interlock function, wherein the control rod driving control function, the control rod interlock function, the boron concentration control function, and the control rod shutdown margin monitor function are control functions related to the output of the nuclear reactor, wherein the first through fourth feed water control functions, the first through fourth main steam relief valve control functions, the first through fourth main steam relief valve interlock functions, the turbine bypass control function, and the main feed water pump speed control function are control functions related to heat removal of the turbine system, and wherein the pressurizer pressure control function and the pressurizer interlock function are control functions related to the pressure of the nuclear reactor cooling system, wherein the first through fourth programmable processors are configured to perform the first through fourth feed water control functions, respectively, to avoid simultaneous occurrence of abnormalities in any two of the first through fourth feed water control functions, wherein the first through fourth programmable processors are configured to perform the first through fourth main steam relief valve control functions, respectively, to avoid simultaneous occurrence of abnormalities in any two of the first through fourth main steam relief valve control functions, wherein the fourth, first, second and third programmable processors are configured to perform the first, second, third and fourth main steam relief valve interlock functions, respectively, to avoid simultaneous occurrence of abnormalities in any two of the first through fourth main steam relief valve interlock functions, wherein the first through fourth programmable processors are configured to perform the first through fourth main steam relief valve control functions, respectively, and the fourth, first, second and third programmable processors are configured to perform the first through fourth main steam relief valve interlock functions, respectively, to avoid simultaneous occurrence of abnormalities in any one of the first through fourth main steam relief valve control functions and any one of the first through fourth main steam relief valve interlock functions, respectively, wherein the fifth programmable processor and the sixth programmable processor are configured to perform the turbine bypass control function and the turbine bypass interlock function, respectively, to avoid simultaneous occurrence of abnormalities in the turbine bypass control function and the turbine bypass interlock function, wherein the second programmable processor and the first programmable processor are configured to perform the pressurizer pressure control function and the pressurizer interlock function, respectively, to avoid simultaneous occurrence of abnormalities in the pressurizer pressure control function and the pressurizer interlock function, wherein the sixth programmable processor and the fifth programmable processor are configured to perform the control rod driving control function and the control rod interlock function, respectively, to avoid simultaneous occurrence of abnormalities in the control rod driving control function and the control rod interlock function, and wherein the sixth programmable processor is configured to perform the control rod driving control function to avoid simultaneous occurrence of abnormalities in the control rod driving control function and the first through fourth feed water control functions performed by the first through fourth programmable processors, respectively; and wherein the fifth programmable processor and the fourth programmable processor are configured to perform the boron concentration control function and the control rod shutdown margin monitor function, respectively, to avoid simultaneous occurrence of abnormalities in the boron concentration control function and the control rod shutdown margin monitor function.