Performance Research Of General Passive Fluid Controlling Cell Prototype For Cavity Water Injection And Cooling System

The cavity water injection and cooling system(CIS)is a mitigation measure set up by HPR1000 to deal with serious accidents.After the accident,the system can inject cooling water into the outer surface of the pressure vessel to maintain the integrity of the pressure vessel and prevent the leakage of radioactive substances.CIS is divided into two parts: active subsystem and passive subsystem.The two subsystems are independent of each other.The active subsystem mainly deals with serious accident conditions except SBO,and can inject the water in the fire pool and the refueling water tank in the containment into the insulation layer of the reactor pressure vessel;The passive subsystem can cope with serious accident conditions including SBO.The water in the passive reactor cavity water injection tank in the containment can be injected into the reactor pressure vessel insulation layer by gravity,submerge the lower head of the reactor pressure vessel to a certain height,and compensate the evaporation of water in the reactor cavity.Based on the research on the application of general passive fluid controlling cell technology in CIS,considering the specific working environment and functions of CIS passive subsystem,this paper improved and optimized CIS-GPFC,added system protection structure for GPFC prototype.This structure can provide a normal working environment for each GPFC subsystem under the severe accident environment;The intelligent subsystem,executive subsystem and power subsystem of GPFC are introduced in detail;The flow automatic control program and configuration interface are developed by using ladder diagram language and configuration software.Secondly,the GPFC prototype performance test system is built to further investigate the flow automatic regulation function,comprehensive energy consumption and temperature resistance of the GPFC prototype.The main experiments include: temperature assessment experiment,automatic flow regulation experiment and system energy consumption experiment.The experimental results show that the temperature resistance and system operation energy consumption of GPFC system in this paper meet the design requirements,and the automatic flow regulation performance is good.The regulation oscillation phenomenon is found in the flow experiment.The system energy consumption in the oscillation process is further analyzed,and the critical ratio of oscillation time to normal operation time under the condition that the equipment can meet the 72 hour passive requirements of nuclear power is obtained.The reasonable allowable regulation error value is explored through the flow experiment.It lays a foundation for the practical application of GPFC.