Research On The Natural Circulation Characteristic And The Transient Behavior Of Gas-steam Pressurizer In The Primary Loop Of Integrated Reactor

In the background of increasing pressure of the energy restructuring and the serious environmental pollution in our country,the integrated natural circulation reactor has received extensive attention for the ability of providing clean,safe and economical energy.At present,the steady-state natural circulation characteristic and the transient behavior of gas-steam pressurizer under high pressure need to be further studied in the integrated natural circulation reactor with gas-steam pressurizer.In this paper,the integrated natural circulation test loop with the gas-steam pressurizer(HRTL-200?)has been established,and the experimental study on the steady-state natural circulation characteristic and the transient behavior of the gas-steam pressurizer is set in HRTL-200?.In addition,the theoretical investigation of the flow-resistance performance in the steady-state natural circulation is presented.The non-equilibrium gas-steam pressurizer model has been established and the improvement on the steam condensation heat transfer model in presence of non-condensable gas is also proposed.The test loop of HRTL-200? has been established firstly.Under the system pressure of 5.0~7.0MPa,the experimental study on the effect of the heating power,the inlet resistance coefficient of the core,the total pressure,the outlet sub-cooling of the core,the pressure and the mass flow rate in the second loop on the steady-state natural circulation characteristic is set in HRTL-200?.The experimental result proves that the integrated natural circulation reactor can establish the steady full power natural circulation under high pressure and high temperature,which provides the data support for the design and operation of the integrated natural circulation reactor.For the flow-resistance characteristic in the steady-state natural circulation,the power function relations of ~mG Q and f~q(35)p G are obtained in theory and have been validated by the experiments of HRTL-200?.The power function relations reveal the effect of the flow regime and the system resistance on the flow-resistance characteristic in the steady-state natural circulation.Moreover,for the problems existing in the integral arrangement,the quantitative analysis result shows that the errors of the natural circulation capacity caused by neglecting the heat transfer between the hot-leg and the cold-leg,and the linear assumption in the temperature distribution of the hot source and hot sink can be neglected within limits.Experimental research on the transient behavior of the gas-steam pressurizer in HRTL-200?has been carried out.The experimental result indicates that under the condition of the power step-up,the hysteresis phenomenon exist in the dynamic response characteristic of the system pressure and the outlet sub-cooling of the core decreases rapidly,which will influence the nuclear reactor safety.In addition,the effect of the secondary loop regulation and the initial parameters in the primary loop on the transient behavior of the gas-steam pressurizer is also studied experimentally,which provides the guidance of the safe operation of the integrated natural circulation reactor with the gas-steam pressurizer.In order to make further research on the transient behavior of the gas-steam pressurizer in HRTL-200?,the non-equilibrium gas-steam pressurizer model under high pressure has been established.The model validation is carried out by comparing with the experimental result of HRTL-200?,which proves the correctness of the established non-equilibrium gas-steam pressurizer model.The steam condensation heat transfer model in presence of non-condensable gas under high pressure is also proposed,and it provides theoretical insights into the pressure's influence mechanism to the steam condensation heat transfer in presence of non-condensable gas.As a result,this established model has been applied to the non-equilibrium gas-steam pressurizer model.