SAFETY ANALYSES FOR TRANSIENT BEHAVIOR OF PLASMA AND IN-VESSEL COMPONENTS DURING PLASMA ABNORMAL EVENTS IN FUSION REACTOR

摘要

Safety analyses on plasma abnormal events have been performed using a hg-brid code of a plasma dynamics model. and a heat transfer model of in-vessel components. Several abnormal events, e.g., increase in fuelling rate, were selected for the international Thermonuclear Experimental Reactor (ITER) and transient behavior oi the plasma and the in-vessel components during the events was analysed. The physics model for safety analysis was conservatively prepared. In most cases, the plasma is terminated by a disruption or it returns to the original operation point. When the energy confinement improves by a factor of 2.0 in the steady state, which is a hypothetical assumption under the present plasma data, the maximum fusion power reaches about 3.3 GW at about 3.6 s and the plasma is terminated due to a disruption, However, the results obtained in this study show the confinement boundary of ITER can be kept almost intact during the abnormal plasma transients, as long as the cooling system works normally. Several parametric studies are needed to comprehend the overpower transient including structure behavior, since many uncertainties are connected to the filed of the plasma physics. iind, future work will need to discuss the burn control scenario considering confinement mode transition, system specifications, experimental plans and safety regulations, etc, to confirm the safety related to the plasma anomaly. [References: 9]