Bo Hanliang

Studies on the performance of the hydraulic control rod drive for the NHR-200

Theoretical analysis and experimental study on the steady state property of the hydraulic control rod drive mechanism for the 200 MW nuclear heating reactor have been carried out in depth. The minimum and maximum holding flow in steady state and their changes along with temperature were identified, and the relationship between the steady state property and the design data of the control rod drive mechanism was analyzed too. A fine agreement between the analysis results and measured data has been achieved.

Study on step-up characteristic of hydraulic control rod driving system

This paper illustrates the work principle of the hydraulic control rod driving system (HCRDS) and the operation of step-up process. As well as the dynamic characteristic of step-up process with the study of experimental results, it also analyzes the influencing parameters of the step-up process, such as holding-flow rate, lift delay time and pressure in front of combined valve, etc. The initial theoretical model of step-up process of HCRDS has been established on the basis of rational analysis, simplification and hypothesis. The calculation result of the theoretical model approximately coincides with the experimental result, which lays a solid foundation for the auxiliary mechanism analysis of HCRDS.

Charge deposition model for investigating SE-microdose effect in trench power MOSFETs

It was demonstrated that heavy ions can induce large current-voltage ( I-V ) characteristics shift in commercial trench power MOSFETs, named single event microdose effect (SE-microdose effect). A model is presented to describe this effect. This model calculates the charge deposition by a single heavy ion hitting oxide and the subsequent charge transport under an electric field. Holes deposited at the SiO 2 /Si interface by a Xe ion are calculated by using this model. The calculated results were then used in Sentaurus TCAD software to simulate a trench power MOSFETs I-V curve shift after a Xe ion has hit it. The simulation results are consistent with the related experiments data. In the end, several factors which affect the SE-microdose effect in trench power MOSFETs are investigated by using this model.