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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.”
Hiroo Numata, Izumi Ohno
Fusion Science and Technology | Volume 38 | Number 2 | September 2000 | Pages 206-223
Technical Paper | doi.org/10.13182/FST00-A143
Articles are hosted by Taylor and Francis Online.
The physicochemical properties of the Pd-H system were studied by in situ potentiometric, resistance, and dilatometric measurements in each of three applied pulse modes, A, B, and C, and repeated H absorption and desorption. Potential, resistance ratio, and an increase in dilation (l/l0) were measured simultaneously after H equilibrium was attained with the Pd electrode. During continuous absorption, structural phase transition ( [right arrow] ) and void formation occurred, and the values of the H/Pd ratio in the limiting phase, in the + phase coexistence, and in the transition and the +voids coexistence regions are consistent with those obtained from the Pd-H isotherm at 40°C. Hydrogen absorption caused the dilation, from whose slope the molar volume was obtained as 0.64 ( phase) and 0.40 ( + phase) cm3/mol. The resistance increased in proportion to the H/Pd ratio and was kept constant at 1.7 to 1.8 over Rtr.For the first absorption through the phase (>min), the electrode potential shifted with an increase in dilation, which suggests nonequilibrium PdH2-x precipitation followed by conversion to the phase and void formation. Although there was a remarkable lack of any dependence on the number of repetitions of the values of the limiting resistance and potential corresponding to the + and + void coexistence, the onset of the phase, min, increased as the number of repetitions increased. The volumetric ratio for an increase in the H/Pd ratio corresponds to the absorption in high-density defect areas surrounding voids. During repeated absorption and desorption in the C applied pulse mode, the apparent molar volumes of the + phase coexistence show that absorption proceeds inhomogenously, in contrast to the first absorption in the A applied pulse mode.