Pwr Nuclear Power Plant Localization Study On Motor Driven Auxiliary Feed Water Pump

Nuclear power plant can produce large amounts of electricity with just a little nuclear fuel consumption. The state has increased investment in nuclear power area, approved and started a number of nuclear power projects. At the same time, nuclear power equipments will also get a development opportunity, in which pump equipments are essential. However, from a technical point of view of nuclear pumps, in 1000 MW nuclear power plant, fabrication technology of nuclear pump is still at research and development status and prototype pump stage. Its localization is at low levels.In 1000 MW nuclear power plant that is pressure water reactor type, Nuclear Class II motor driven auxiliary feed water pump is the main pump in auxiliary feed water system of steam generator of nuclear power plant. In order to realize 100% localization of auxiliary feed water pump, study should be done in hydraulic design, flow field analysis, structure design, design and calculation of pressure retaining boundary, mechanical property analysis, material substitute, standard substitute, structure design improvement, etc.Taking computational fluid dynamics CFD software Fluent, based on Reynolds averaged N-S equations and RNG k -εturbulence model and mixed multi-phase flow mode, cavitation in the first stage impeller is simulated. Through simulation, cavitations flow situations of the impeller under various flows are obtained, which has a vital significance to the impeller optimized design.To keep pump unit having at a stable, integral, reliable operation, it is necessary to do design and calculation of pressure retaining boundary. The text takes two methods of pump casing for design and calculation. One is dimensional calculation, the other is ANSYS stress analysis.Using ANSYS software to do torsional analysis on pump rotor obtains torsional critical speed. It confirms that torsional critical speed is away from the rated speed and the rotor meets the requirement of design specification. Taking FEM calculation on stage casing, foreign material of stage casing is replaced by domestic material. This material replacement is an essential part of localization of auxiliary feed water pump.Study on simulation analysis, design and calculation and torsional analysis provides valuable data and experience in localization of auxiliary feed water pump. And it also provides an important theoretical basis for localization of similar type of nuclear pump.