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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.
José Guasp, Macarena Liniers, Cándida Fuentes, Germán Barrera
Fusion Science and Technology | Volume 35 | Number 1 | January 1999 | Pages 32-41
Technical Paper | doi.org/10.13182/FST99-A75
Articles are hosted by Taylor and Francis Online.
The neutral beam power transmitted into the helical axis stellarator TJ-II is calculated for the final duct design of TJ-II. The transmitted beam is intercepted by the first toroidal field coil before reaching the plasma. The nontrapped fraction of the beam hits various vacuum vessel components.The adopted design of the graphite thermal shields used as vacuum vessel protection at TJ-II is presented. The design achieves a compromise between maximum power into the torus and minimum loads on sensitive parts.A three-dimensional version of the beam geometric code DENSB is set up to calculate the power loads due to shine-through neutrals on the shields under these circumstances. Power load maps are the input to the finite element code ANSYS for the calculation of temperature distributions.For the usual duty cycle at TJ-II (300-ms pulses every 300 s), the peak surface saturation temperatures at all surfaces remain under 650 °C, well below the tolerable limits for graphite.