To solve the common problem that high bearing temperature occurred on 100MW steam turbine in a nuclear power station during the bearing’s rolling and operation

the variation of bearing temperature against the bearing elevation was calculated according to the GB/T 21466.2-2008.Then the results were compared with the design data that the manufactory provided

to evaluate whether the actual bearing temperature was too high and why.The results showed that such factors as the bearing elevation change

the liner deformation and the bearing misalignment caused the high temperature of bearing during its rolling and operation

but not the design.After implementation of countermeasures like eliminating the bearing elevation variation

scraping the liner deformation and regulating the bearing misalignment

the bearing temperature was controlled within 90 ℃ during the turbine rolling and full load operation.The temperature difference between the bearings was more reasonable and the device safety margin was improved.