Significance of erosion corrosion

Stainless steel and nickel base alloys are generally resistant to erosion corrosion. Because the vessel internals are made of stainless steel, erosion corrosion resistance of BWR vessel internals has been excellent under design basis operating conditions 

Within the BWR core region, the jet pump assemblies experience high velocity as well as restricted flow regions. Since the flow in other regions is lower, consequences of erosion corrosion of less concern and an accompanying reduction in section has little impact. There has been no evidence of erosion corrosion in the jet pump throat area which would be 

The major stressor in fretting and wear is flow induced vibration. Initiation, stability, and growth characteristics of damage by these mechanisms may be functions of a large number of variables, including the local geometry, the stiffness of the component, the gap size between the parts, flow velocities and directions, and oxide layer characteristics. Wear is defined as the removal of material surface layers due to relative motion between two surfaces or under the influence of hard. 

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