Abnormal Operation Analysis and Optimization Study of the First Group of Bypass Valves in Nuclear Power Plant at Low Power
The turbine bypass discharge system(GCT)of nuclear power plant is a cooling system set up to balance the primary and secondary circuit power.A total of four groups of discharge valves are set,of which the first group of bypass discharge valves is used most frequently and has the longest residence time,so the probability of failure is high.The abnormal opening or limit fault of the first group of valves has occurred in many power plants,which is of great significance for research work.The control process of the first group of valves is not only complicated because of its sequential modulation and opening characteristics,but also because it affects many main regulation and control systems.Therefore,it is very important to master the abnormal operating conditions of the first group of valves to ensure the safe and reliable operation of nuclear power plants.Through the combination of theoretical analysis and simulator verification,this paper explores the influence of the abnormal opening and limit of the first group of GCT discharge valves at different power stages on the main control systems such as steam generator level control,pressurizer level control,control rod(R rod and G rod)control,GCT-c control and final power setting value,and draws a conclusion on steam generator level control and GCT-c control in case of failure,give specific measures to optimize the operation of the system,and put forward suggestions for improvement,so as to improve the emergency handling capacity of operation,stabilize the key parameters of the unit,and ensure its safe and reliable operation.At the same time,the operation suggestions of grid connection at high power level are put forward,which greatly improves the economic benefits of the unit.
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