IAEA-CN-33/G 1-2 MAJOR DESIGN FEATURES OF THE CONCEPTUAL D-T TOKAMAK POWER REACTOR, UWMAK-II

MAJOR DESIGN FEATURES OF THE CONCEPTUAL D-T TOKAMAK POWER REACTOR, UWMAK-II. The conceptual design of a 5000 MW(th) ( ~ 1700 MW(e)) helium-cooled tokamak fusion reactor is presented. The fuel is deuterium and tritium and the structural material is 316 stainless steel. The design has a low aspect ratio (2. 6) and low toroidal field on axis (35. 7 kG) with 24 extended "D"-shaped super-conducting TF coils. A superconducting air core transformer is designed with windings outside TF coils while the vertical field magnets, also superconducting, are inside the extended "D's". The plasma operating condi-tions have been determined using pessimistic scaling laws resulting from the trapped-ion instability. Such scaling can be beneficial in the reactor regime. A double-null poloidal field divertor is included for impurity control and a two-dimensional woven carbon cloth mounted on the vacuum chamber wall is included to protect the plasma from high-Z impurities and the first structural wall from erosion by charged-particle bombardment. The helium-cooled blanket contains solid Be in canned rods for neutron multiplication and solid lithium aluminate, also in canned rods, for tritium breeding. The breeding ratio is 1.19, the energy per fusion is 21. 56 MeV, and the tritium inventory in the blanket is low, 42 g. Radiation damage problems are similar and as serious as those found in our previous study. Periodic replacement of blanket modules every two years will probably be require