Heat Release in the Reactor Core.- Temperature Inside the Fuel Elements.- The "Simple" Steady Boiling Flow in A Pipe.- The "Simple" Steady Three-Fluid Boiling Flow in A Pipe.- Core Thermal Hydraulics.- Flow Boiling and Condensation Stability Analysis.- Critical Multiphase Flow.- Steam Generators.- Moisture Separation.- Pipe Networks.- Some Auxiliary Systems.- Emergency Condensers, Reheaters, Moisture Separators and Reheaters.- Core Degradation.- Melt-Coolant Interaction.- Coolability of Layers of Molten Reactor Material.- External Cooling of Reactor Vessels During Severe Accident.- Thermo-Physical Properties for Severe Accident Analysis.- Lead, Bismuth and Lead-Bismuth Eutectic Alloy.- Containment Thermal-Hydraulics.