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Fuel Cycle & Waste Management
Devoted to all aspects of the nuclear fuel cycle including waste management, worldwide. Division specific areas of interest and involvement include uranium conversion and enrichment; fuel fabrication, management (in-core and ex-core) and recycle; transportation; safeguards; high-level, low-level and mixed waste management and disposal; public policy and program management; decontamination and decommissioning environmental restoration; and excess weapons materials disposition.
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Utility Working Conference and Vendor Technology Expo (UWC 2024)
August 4–7, 2024
Marco Island, FL|JW Marriott Marco Island
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The Standards Committee is responsible for the development and maintenance of voluntary consensus standards that address the design, analysis, and operation of components, systems, and facilities related to the application of nuclear science and technology. Find out What’s New, check out the Standards Store, or Get Involved today!
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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.”
Xiaoming Yang , Ran Liu, Li Zhang (CAPE)
Proceedings | Pacific Basin Nuclear Conference (2018 PBNC) | San Francisco, CA, September 30-October 4, 2018 | Pages 30-33
A simplified model with lumped parameters for mass, momentum and energy governing equations is usually used for thermal-hydraulic analysis during severe accident of a Nuclear Power Plant (NPP). In one of this kind of model, the flow in the flow path between two control volumes is usually simplified as one-dimensional pipe flow, and the extended expression of the Bernoulli Integral in the unsteady flow is used to solve the momentum governing equation correspondingly. It is noticed that the solution of the velocity in the flow field is very sensitive to the length of the streamline, so-called as inertia length introduced by the unsteady flow, corresponding to the inertia loss in the flow path.
Based on the theoretical model for the extended expression of the Bernoulli Integral in the unsteady flow, this paper shows the theoretical sensitivity analysis of the inertial length to the solution of the momentum governing equation firstly. According to the analysis, a sensitive study model for the inertia length was built by the thermal-hydraulic code, and the responses of the velocity, pressure and temperature versus different inertia lengths were studied. The results show that there is a slower time response of the fluid system states while the inertia length increases, and the thermal-hydraulic response is very sensitive to the inertia length of a flow path. Therefore, it is strongly recommended to choose the inertia length very carefully when dealing with the inertia response of the thermal-hydraulic system during severe accident analysis.