Real-time Simulation And Operating Characteristics Research Of Passive Residual Heat Removal System

Passive safety technology has been used since the Gen III nuclear power technologies,and it is widely utilized in nuclear power station under construction. The features of passive safety technology that don't rely on equipment which needs power and reduce operation can improve the reliability and safety of nuclear power plant.Passive residual heat removal system is a significant part of passive safety technology.Its function is to remove the heat in case that the core is burned in high temperature from core by using the density difference and the height difference to drive the natural circulation without the external power.Based on structural properties and physics regular, the program of passive residual heat removal exchangers is developed by Fortran language. The program is connected with other loop that programed by real-time thermal hydraulic simulation analysis and calculation program THEATRe. After combined debugging, the program is running to simulate accidents in simulation platform SimExec.The conclusions show that the passive residual removal system models can satisfy the condition of real-time simulation. After station black-out accident in 100%FP and 50%FP,the mass variation of the system, temperature variation of reactor core, main heat exchangers and passive residual heat removal exchangers match the theory analysis. The heat transfer capacity of passive residual heat removal system satisfies the requirements. In order to protect the safety of the reactor, this system has the ability to take away the core thermal and decay heat. In passive residual heat removal system inadvertent input accident, the nuclear power station reaches a new status that power more than 100% FP. In the process, the change the parameters of three loops are under the design parameters, the reactor is safe in the accident.