An improved European helium cooled pebble bed blanket

Progress on solid breeder TBM at SWIP

“…During plasma disruption, with the peak energy flux deposition at 0.55 MJ/m 2 in 1 ms, with the corresponding heat flux of about 550 MW/m 2 and follow by the subsequent energy flux of 0.72 MJ/m 2 during the next 40 ms with corresponding heat flux of about 18 MW/m 2 [4]. Fig.…”

“…9. The maximum stress of RAFM steel is 365 MPa which can meet the 3Sm allowable stress requirement [4], but that of beryllium layer is 281 MPa which is outside the allowable stress. Compared with that of Be, the yield strength of W is high [5], but there is a big difference of thermal expansion coefficient between W (4.16 × 10 −6 /K) and RAFM steel (11.9 × 10 −6 /K) which will result in a high stress at their interface, so it is suggested the use of the W/Cu alloy as the interface material (the thermal expansion coefficient of Cu is about 18.9 × 10 −6 /K [5]), in virtue of the thermal expansion coefficient of W/Cu alloy can be controlled by adjusting the material composition.…”

Feasibility of Hydrogen Production Using Laser Inertial Fusion as the Primary Energy Source

“…One of the blanket concepts being evaluated for the ITER program DEMO fusion reactor is known as the Helium-Cooled Pebble Bed (HCPB) [Hermsmeyer (1999)]. A schematic of the HCPB concept, which is a typical helium-cooled blanket, is shown in Figure 3 -9 [Diegele (2002)].…”

“…The helium is also used to cool the FW. Temperature limits on the FS structure restrict the coolant outlet temperature to no more than 500-550°C [Hermsmeyer (1999)]. Helium coolant inlet and outlet temperatures of 300°C and 500°C, respectively, have been reported for the DEMO blanket [Ihli (2006)].…”

“…(Preliminary attempts to increase the maximum temperature of the Pb-17Li coolant in the SiC f /SiC chamber with magnetic diversion by optimizing the first wall while maintaining stresses at an acceptable level and increasing the size of the chamber actually resulted in a Pb-17Li outlet temperature of around 1100°C [Raffray email (2006)]. ) The HCPB [Hermsmeyer (1999)] and other helium-cooled concepts using FS structures were not considered because the 500-550°C coolant outlet temperatures to which they are restricted are too low for efficient water-splitting processes currently under development. This is discussed further in Section 5.…”