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Latest News
NRC could improve decommissioning trust fund oversight, OIG reports
The Nuclear Regulatory Commission could do more to improve its oversight of decommissioning trust funds, according to an assessment by the NRC’s Office of Inspector General. In particular, the assessment, which was conducted by Crowe LLP on behalf of the OIG, identified four areas related to developing policies and procedures, workflows, and other support that would enhance NRC oversight of the trust funds.
Bin Liu, Huasi Hu, Tiankui Zhang, Xingyin Guan
Fusion Science and Technology | Volume 66 | Number 3 | November 2014 | Pages 405-413
Technical Paper | doi.org/10.13182/FST13-775
Articles are hosted by Taylor and Francis Online.
Parameters of fusion reaction history play an important role in inertial confinement fusion diagnosis. Two types of detectors, named gas Cherenkov detector (GCD) and gamma reaction history (GRH), have been well applied for measurement of fusion reaction history due to their fast responses and capacities for setting the threshold. This study was carried out in two stages. First, simulation of some components of the GRH system was carried out with Geant4. Second, an optimization method by combining a genetic algorithm with the Geant4 code was established and applied to the optical reflectors of the GRH system. The optimization process was focused on 16.7-MeV gamma rays with a threshold of 12 MeV. An optimal time response of 5 ps and an efficiency at the receiving surface of 2.2661×10−2 Cherenkov photons/incident 16.7-MeV gamma ray were obtained at 1.9158 atm of CO2 pressure and a temperature of 20°C.
