The Peaking at the Edge of Near- Edge Channels is the most Limiting
Case No. q up q dn q s q up / q dn q max / q dn or s A6330N/A2.11.25 B12054N/A2.21.25 C17880N/A2.21.25 C-3D23868N/A3.51.2 M-3D286852803.43.0 / 1.4 M2551253302.03.0 / 1.4 N2381263401.93.0 / 1.2 O168832452.03.0 / 1.2 Summary of Power Split and Peaking Factor Results from the Direct Numerical Simulations (all fluxes in kW/m2 ) The 3D results were confirmed with further calculations that included refined meshes, and a 10-fold increase in viscosity due to addition of the sacrificial concrete.
Sample calculations of turbulent natural convection
Natural convection boiling in inclined channels: the SULTAN facility Vertical and 10 degrees inclination Characteristic length: 3 and 15 cm Channel length: 4 m Pressure: 0.5 MPa Power levels 100 to 500 kw/m2 Detailed pressure drop data Top-heated plate, 15 cm wide
Boiling in inclined channels : Sample comparisons for inclination
Natural convection in BiMAC: stable, self-adjusting flow
Thermal Margins for BiMAC no- Dryout due to water depletion or flow starvation
Conclusion (3): Summary of containment threats and mitigative mechanisms or systems in place for responding to them ThreatFailure ModeMitigation DCHEnergetic DW FailurePressure Suppression Vents Reinforced Concrete Support UDW Liner Thermal FailureLiner Anchoring System LDW Liner Thermal FailureReinforced Concrete Barrier Gap Separation from UDW EVEPedestal/Liner FailureDimensions and Reinforcement BiMAC FailurePipe Size and Thickness Pipes Embedded into Concrete BMP & CCI BiMAC Activation FailureSensing & Actuation Instrumentation Diverse/Passive Valve Action Local BurnoutNatural Circulation Water DepletionNatural Circulation Local Melt-ThroughRefractory Protective Layer