Thermal-hydraulic design for the lithium-cooled TITAN reversed-field-pinch reactor

A thermal-hydraulic design of the first wall and blanket of the 18 MW/m2 neutron wall loading TITAN reversed-field-pinch (RFP) fusion reactor using liquid-lithium as coolant and V-3Ti-1Si as structural material is described. The first wall is made of tubes and the blanket coolant channels are a combination of tubular, square and rectangular channels. The coolant channels are aligned with the larger poloidal magnetic field. The first-wall and blanket coolant circuits are separate. Magnetohydrodynamic (MHD) turbulent-flow heat transfer is utilized when the heat flux on the first wall is high, allowing an extension of the design window up to about 5 MW/,m2 heat flux. The coolant velocities are 21 m/s in the first-wall and about 0-.5 m/s in the blanket coolant channels. The corresponding pressure drops are 10 MPa and 3.0 MPa, respectively. The coolant pumping power is about 53 MW which is less than 5% of the electric output. The coolant inlet temperature is 3200C and the exit temperatures are 4400C and 7000C for the first-wall and blanket circuits, respectively. The maximum structure temperature is less than 750C and the material stresses are below the allowable design limits