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Fusion Science and Technology
Latest News
Securing the advanced reactor fleet
Physical protection accounts for a significant portion of a nuclear power plant’s operational costs. As the U.S. moves toward smaller and safer advanced reactors, similar protection strategies could prove cost prohibitive. For tomorrow’s small modular reactors and microreactors, security costs must remain appropriate to the size of the reactor for economical operation.
Frederick A. Haas, Anantanarayanan Thyagaraja
Fusion Science and Technology | Volume 31 | Number 2 | March 1997 | Pages 159-168
Technical Paper | Plasma Engineering | doi.org/10.13182/FST97-A30818
Articles are hosted by Taylor and Francis Online.
An important issue infusion power plant design involves the effect of sawteeth on power transients and ash removal. A model was previously presented for sawtooth oscillations in tokamaks based on a thermal instability mechanism mediated by turbulence in the q < 1 core. This model has been validated against current machines such as the Joint European Torus (JET) and the Tokamak Experiment for Technol.ogy-Oriented Research (TEXTOR). Here, it is adapted to include effects of alpha particle heating in a reacting plasma. The goal is to study the interaction between fusion reactions and the sawtooth turbulence dynamics. The alpha particle heating rate function is sensitive to temperature variations and could possibly result in a thermal instability mechanism for amplifying sawtooth temperature fluctuations under typical conditions. Taking International Thermonuclear Experimental Reactor (ITER)-like conditions as an example, calculations are performed to illustrate this generic behavior. These conditions suggest that while the sawteeth are effective in helium ash removal from the q < 1 region, they can produce significant spikes in the alpha power.