The utility model relates to a pump for the nuclear power station, specifically speaking are avionics cooling water pump for nuclear power station, including the pump body, pump cover, impeller, bearing body and pump shaft, wherein pump cover and pump body sealing connection together, form a complete space that overflows, the pump shaft is inserted and is established between the pump body and pump cover, and the both ends of pump shaft are supported through the non - inboard bearing body of installing the inboard bearing body on the pump body and install on the pump body respectively, and the pump shaft is located the one end of driving side and is worn out, is linked to each other with the driving machine by the inboard bearing body, be equipped with import and export on the pump body respectively, the utility model has the characteristics of reliability height, long service life, general degree height, operation are stably, especially, efficient more outstanding.