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Fusion Science and Technology
Inspecting nuclear facilities with unmanned aerial systems
Over the past decade, unmanned aerial systems (UASs), more commonly referred to as drones, have played an increasing role in the day-to-day activities of the energy sector. Applications range from visually inspecting wind turbines, flare stacks, pipelines, and facilities to evaluating vegetation encroachment near power lines. Although the benefits of UASs have been reported in these industries, their use in the nuclear community has only recently been explored. For instance, a drone was sent into a waterbox at a Duke Energy facility to inspect for leaks.1 And at Fukushima Daiichi, a drone was used to conduct a post-accident radiation survey inside Unit 3, and drones are being investigated for use inside the damaged containments.2
T. Mutoh, K. Nagaoka, H. Takahashi, H. Kasahara, M. Osakabe, S. Kubo, T. Shimozuma, Y. Yoshimura, K. Tsumori, T. Seki, K. Saito, H. Igami, H. Nakano, K. Ikeda, M. Kisaki, R. Seki, S. Kamio, T. Ii, Y. Nakamura, Y. Takeiri, O. Kaneko, LHD Experiment Group
Fusion Science and Technology | Volume 68 | Number 2 | September 2015 | Pages 216-224
Technical Paper | Proceedings of TOFE-2014 | dx.doi.org/10.13182/FST15-120
Articles are hosted by Taylor and Francis Online.
Recent advances in the high power and steady state heating system and experiment results of the Large Helical Device (LHD) are reviewed in this paper. Plasma performance is extended largely through high power NBI, ECH and steady state ICRF heating devices, and improved operation techniques. The NBI of a 28 MW has extended the plasma parameter regime such as ion ITB plasmas, has a central ion temperature of more than 8 keV, and the extremely high-density plasmas ten times higher than the tokamak limit. An ECH system with seven gyrotrons (total power of 4.6MW) has been operated for pre-ionization and plasma heating. The high electron temperature regime was extended toward a higher density regime and a central electron temperature of 13.5 keV was achieved with a line-averaged electron density of ne = 1 x 1019 m-3. Steady state operation plasma with ne = 1.2 x 1019 m-3, ion and electron temperature of 2 keV, and plasma sustainment time of 48 min was achieved with ICH and ECH heating power of 1.2 MW for majority helium with minority hydrogen.