Mechanism of Thermal-Hydraulic Instability

4 Thermal-Hydraulic Stability Considerations 5.4.1 Mechanism of Thermal-Hydraulic Instability 

Fundamentally, the thermal-hydraulic instability is caused by the lag introduced into the thermal-hydraulic system by the finite speed of propagation of density perturbations. As described in the previous section, as the coolant flows from the 

Pressurization (startup of feedwater pump) Start of nuclear heating Turbine startup Line switching Power raising  

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