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NRC’s Inspector General issues report
Overall findings of a survey of Nuclear Regulatory Commission personnel indicate that while the NRC maintains a few strengths compared to external benchmarks, results have declined since 2015 in a number of areas, according to a recent report from the NRC’s Office of the Inspector General (OIG).
The survey was conducted in February 2020 by Willis Towers Watson, a global risk-management, insurance brokerage, and advisory firm that has partnered with the OIG for more than 20 years to assess the NRC’s safety culture and climate, as well as other aspects of employee experience.
Koichi Maki, Takashi Okazaki
Fusion Science and Technology | Volume 4 | Number 3 | November 1983 | Pages 468-478
Technical Papers | Blanket Engineering | dx.doi.org/10.13182/FST83-A22796
Articles are hosted by Taylor and Francis Online.
Effects of blanket composition, including materials and their thicknesses, on the tritium breeding ratio in tokamak fusion reactors are investigated for the Li20 blanket having a separable first wall. The sensitivities of the breeding ratio to the thicknesses of the materials for the first wall are estimated as follows (unit: TBR/cm): Ssic= −.05, Scu= −.13, SAl= −.04, Sss= −.03, SHe= 0.0, SD2o= −.02, SH2o= −.09. From these results, aluminum and stainless steel are seen as suitable for such first-wall structural materials as cooling tubes, and heavy water is appropriate for the coolant of the first wall. The lead multiplier of 5-cm thickness is used along with Li20, without 6Li enrichment, as the tritium breeding material. The tritium breeding ratio of the blanket is estimated as 1.08.