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Fusion Science and Technology
Latest News
Vogtle-3 shuts down for valve issue
One of the new Vogtle units in Georgia was shut down unexpectedly on Monday last week for a valve issue that has since been investigated and repaired. According to multiple local news outlets, Georgia Power reported on July 17 that Unit 3 was back in service.
Southern Company spokesperson Jacob Hawkins confirmed that Vogtle-3 went off line at 9:25 p.m. local time on July 8 “due to lowering water levels in the steam generators caused by a valve issue on one of the three main feedwater pumps.”
Robert C. Cook
Fusion Science and Technology | Volume 41 | Number 3 | May 2002 | Pages 155-163
Technical Paper | Fourteenth Target Fabrication Specialists' Meeting | doi.org/10.13182/FST02-A17893
Articles are hosted by Taylor and Francis Online.
The sound speed in a Be grain is markedly different in orthogonal directions due to an anisotropic Young’s modulus. The impact of this fact on ICF capsules machined from multi-crystalline Be is not clear, but is of concern if the shock velocity is likewise grain orientation dependent. In this paper the expected inner wall break out profile due to grain affected shock velocity variations is calculated for a Be capsule, as a function of the grain size and effective shock velocity anisotropy factor factor p = v‖ / v⊥, where v‖ and v⊥ are the effective maximum and minimum orthogonal shock speeds in a grain. In this simple model it is assumed that grain boundaries have no effect other than to mark the location where the shock speed changes as it moves from one grain to another. The grain structure of bulk beryllium is modeled by randomly placing N points in a volume V to define Wigner-Seitz cells (grains) of average volume V/N. Each grain is given a random orientation. The spherical shell wall is modeled by a 150 µm thick planar slab of this multi-crystalline material, 2πR in length where R is the capsule radius, taken to be 1000 pm. The slab is sampled at 3600 points along its 2πR length, at each point the average shock velocity through the sample is determined based on the model slab grain structure at that point. This data is used to create the expected spatial breakout profile, which is then Fourier transformed to give a power spectral representation that is compared to the current outside surface design specification. In order to match the design specification, grain diameters less than 10 pm and an effective shock velocity anisotropy, p, of less than 1.001 are necessary.