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Modernizing I&C for operations and maintenance, one phase at a time
The two reactors at Dominion Energy’s Surry plant are among the oldest in the U.S. nuclear fleet. Yet when the plant celebrated its 50th anniversary in 2023, staff could raise a toast to the future. Surry was one of the first plants to file a subsequent license renewal (SLR) application, and in May 2021, it became official: the plant was licensed to operate for a full 80 years, extending its reactors’ lifespans into 2052 and 2053.
I. Yamada, K. Narihara, H. Funaba, T. Minami, H. Hayashi, T. Kohmoto, LHD Experiment Group
Fusion Science and Technology | Volume 58 | Number 1 | July-August 2010 | Pages 345-351
Chapter 8. Diagnostics | Special Issue on Large Helical Device (LHD) | doi.org/10.13182/FST10-A10820
Articles are hosted by Taylor and Francis Online.
The Large Helical Device (LHD) Thomson scattering system measures electron temperature and density profiles of LHD plasmas along the LHD major radius at a horizontally elongated section. The LHD Thomson scattering system has an oblique backward-scattering configuration. The number of observation points and typical spatial resolution are 144 and 17 mm, respectively. The temporal sampling frequency is 10 to 100 Hz. Measurable temperature and density ranges are Te = 5 eV to 20 keV and ne 1018 m-3 , respectively. The LHD Thomson scattering system consists of several subsystems: laser system, light collection optics, polychromators, and data acquisition system. In the past decade, we have continued our efforts to improve the performance and reliability of the LHD Thomson scattering system through extension of measurable temperature and density ranges, Raman and Rayleigh calibrations for absolute density measurements, new laser beam positioning system, and plasma light monitor system for increasing data reliability. In this paper, we describe the recent progress of the LHD Thomson scattering system in detail.
