Analysis and Performance Evaluation of Casting Inclusions in the Reactor Coolant Pump Casing of Nuclear Power Plant

The casting quality of the coolant pump casing nuclear power plant reactor is directly related to operational reliability and safety main pump, plays a key role in integrity pressure-bearing boundary primary loop. In this paper, aiming at low impact performance sample during process plant, through using failure analysis tools like fishbone diagram from multiple dimensions such as material selection, design technology, melting analysis, pouring process, riser design, heat treatment combining with metal macro-fracture micro-electron microscopy scanning methods for cause finally, it was found that basic reason shell secondary inclusions appear on fracture solidification molten steel. Using test-retest inspection finite element mechanics simulation comprehensive evaluation obtain, which provides an effective solution water pumps plants, also important reference structural optimization equipment research development plants.