Nuclear Pump Design And Performance Analysis Based On The New Modeling Design Method

Nuclear pumps are auxiliary equipment of nuclear power plant to ensure the safe and stable operation. They mark the advanced level in the pump technology field. Whether from a security perspective or from the hydraulic performance, the requirements for nuclear pump are much higher than that for ordinary water pump. Nuclear power plants need to use a large number of pumps, according to the ASME specification, these pumps are divided into three security levels. Nuclear reactor coolant pump (nuclear main pump) is the "heart" of the reactor primary circuit system, its nuclear safety level is class I. And as the only high-speed rotating equipment in the nuclear island, it must meet the performance requirements of high temperature, high pressure, large flow and long-term safety use. The backwash pump of strainer filter is the key equipment to guarantee the stability of the filtering system operation in nuclear power plant security water system, its nuclear safety level is class III. Backwash pump is severely eroded by the sea water containing large amounts of sediment, and therefore must have anti-wear and anti-cavitation characteristics.In this paper, on the basis of the original main pump model transformation method put forward by the research group, the high-efficiency modeling design method of nuclear pump is studied and proposed to meet the design requirements. Based on advanced CFD technology, and model pump with excellent hydraulic performance being selected, the modeling design procedure for nuclear pump is written which meet the design requirements in FORTRAN language environment. Furthermore, combined with the secondary development program of modeling software Pro/E, the design and automatic modeling of hydraulic model are achieved respectively for the1400MW nuclear main pump and for the filter backwash pump.For the hydraulic model of1400MW nuclear main pump design in this paper, by using the commercial CFD software NUMECA, three-dimensional viscous flow field of pump is numerically analyzed in detail to check its hydraulic performance, under ensuring the design pressure, flow, temperature and other parameters unchanged, the design is constantly modified, and ultimately the hydraulic model of nuclear main pump is obtained to meet the performance requirements.According to the strict design requirements of backwash pump, the semi-spiral backwash pump volute with variable cross-section is designed. And then both hydraulic performance and cavitation performance of backwash pump hydraulic model are numerically verified using NUMECA,. The study is focused on the hydraulic performance under the whole working conditions for the backwash pump. And the results show that the hydraulic performance curve changes with gentle trend under the whole working conditions, and the head of shut-off condition is controlled between52m and54m. The backwash pump designed in this paper meets the demand of hydraulic and cavitation performance, and it can stably run a long term under variable operation conditions.