A COST MINIMIZED TOKAMAK REACTOR USING CONSERVATIVE COILS COOLING TECHNOLOGY/

One attractive concept for future commercial reactors is one of low co st with minimum advanced technology. Cost-minimized reactors with diff erent operating modes are compared to reveal the most cost-minimized r eactor with impact of deign parameters on the cost of electricity (COE ). Three kinds of operating modes are considered; i.e. first stability region (FS), second stability region (SS) and reversed shear (RS). De uterium-tritium fueled, 1000 MW(e) reactors with conventional aspect r atio are assumed. Several criteria for the parameter survey are used; for example, (1) thermal-to-electricity conversion efficiency is assum ed to be 34.5% with water as a coolant, (2) average neutron wall load must not exceed 5 MW m(-2) with a plasma major radius > 5 m: (3)2 MeV neutral beam injector is applied. It is concluded that the RS operatin g mode is the most cost-minimized. The results indicated that attainin g high beta(N) (the Troyon beta coefficient), low q(95) (safety-factor on the 95% flux surface), and high f(bs) (fraction of bootstrap curre nt) is the best way to obtain a cost-minimized reactor. This cost-mini mized RS reactor is advantageous because it can be designed without us ing advanced coil technology nor an advanced cooling system. (C) 1998 Elsevier Science S.A. All rights reserved.