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August 4–7, 2024
Marco Island, FL|JW Marriott Marco Island
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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.”
R.L. Engelstad, J.W. Powers, E.G. Lovell
Fusion Science and Technology | Volume 19 | Number 3 | May 1991 | Pages 697-702
Inertial Fusion | doi.org/10.13182/FST91-A29426
Articles are hosted by Taylor and Francis Online.
Results are presented for the preliminary mechanical design of a light ion beam Laboratory Microfusion Facility (LMF). Applications of the facility include the development of high gain, high yield ICF targets. The LMF target chamber must meet the requirements imposed by the ion beam propagation, and survive severe target blast loadings. Yields from 10 to 1000 MJ are considered for a projected lifetime of up to 15,000 shots. The chamber will be subjected to repeated loadings that include intense x-ray vaporization of the first wall surface, resulting in large amplitude pressure waves. A carbon/carbon composite thermal liner has been proposed to attenuate the radial shock waves and protect the structural wall. Nevertheless, the chamber wall must still be designed to withstand large impulsive and residual pressures. The proposed target chamber consists of a capped cylindrical shell that is 1.5 m in radius and 4.5 m in height. The analysis of the mechanical response of the structural wall from the repetitive dynamic overpressures is described in detail. Modified elastic constants are used to account for the higher ligament stresses and strains which are present between the beam ports and diagnostic ports. In addition, fatigue lifetime calculations have been made according to ASME guidelines, applying cumulative damage criteria specified by Miner's rule. A modified rainflow cycle counting method was used in conjunction with Goodman diagrams to determine equivalent stresses and strains to be used with the constant amplitude, fully reversed fatigue data. Both 6061-T6 aluminum and 2 1/4 Cr - 1 Mo steel are considered for the structural materials, with maximum stress and fatigue design results developed for a range of thicknesses and overpressures.