Thermal Leading Phenomena and Monitoring for Material Fatigue in Nuclear Power Plants

摘要

Components of thermal power plants are loaded mainly by thermal constraints, temperature transients and internal pressure. The design procedure of the components included definition of hte anticipated pressure and temperature histories. These were intended to make enveloping allowance for the stress and fatigue implications of all transients potentially occurring in service. Experience shows, however, that actually the sequence and frequency of load transients vary to considerable amount. Code regulations, therefore, require relevant loading parameters to be monitored and compared to design margins.