Pumping Device for Nuclear Facility

Abstract

A pump unit for a nuclear installation, for example a pressurized water reactor, contains a vertical shaft, which is guided through at least one journal bearing. The journal bearing or bearings is or are configured as a spiral groove bearing or bearings, to prevent shaft vibration caused by the bearings and to increase the service life of the pump unit. Preferred uses of the pump units include, for example, the coolant pump of a pressurized water reactor and the circulating pump of a boiling water reactor.

1 . A pumping device for a nuclear facility, the pumping device comprising:
 at least one sliding bearing being a radial bearing and embodied as a spiral flute bearing; and   a vertically directed shaft being guided by said at least one sliding bearing.   
   
   
       2 . The pumping device according to  claim 1 , wherein the pumping device is a coolant pump of a pressurized water reactor. 
   
   
       3 . The pumping device according to  claim 1 , wherein the pumping device is a recirculation pump of a boiling water reactor. 
   
   
       4 . The pumping device according to  claim 1 , wherein said at least one sliding bearing has an axial flow through it.