One of the most important limitations on the efficiency with which a nuclear electric power plant can be operated is dictated by the volumetric flow rates with which fluids can be circulated through associated heat transfer equipment such as heat exchangers and steam generators. Failure to maintain fluid flow velocities in this equipment below certain critical levels will result in unacceptable levels of vibration induced in tubes of the tube bundles in this equipment. This sustained vibration will result in fretting wear on tube surfaces as the tubes impact on tube-support surfaces or, in extreme cases, when tubes impact on...