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Division Spotlight
Mathematics & Computation
Division members promote the advancement of mathematical and computational methods for solving problems arising in all disciplines encompassed by the Society. They place particular emphasis on numerical techniques for efficient computer applications to aid in the dissemination, integration, and proper use of computer codes, including preparation of computational benchmark and development of standards for computing practices, and to encourage the development on new computer codes and broaden their use.
Meeting Spotlight
Utility Working Conference and Vendor Technology Expo (UWC 2024)
August 4–7, 2024
Marco Island, FL|JW Marriott Marco Island
Standards Program
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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August 2024
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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.”
G. Mignot, S. Balderama (Oregon State Univ), N. Woolstenhulme (INL), W. Marcum (Oregon State Univ)
Proceedings | Advances in Thermal Hydraulics 2018 | Orlando, FL, November 11-15, 2018 | Pages 892-903
Pulse generated in the Transient Reactor Test facility at Idaho National Laboratory can reach a minimum full width at half maximum of 100 ms. for a maximum power of 5500 MW with the current configuration. To reproduce conditions of a Reactivity Insertion Accident postulated for Light Water Reactor, the width of the pulse shall decrease down below 50 ms. to increase even more the maximum power. To reach this goal, it is intended to initiate higher power transient that could quickly be clipped to maintain the total energy deposition within the 2500 MJ limit of the reactor operation license. One of the pulse clipping options under consideration is the implementation of a fast-negative reactivity insertion system by injecting helium 3 in the core. Initial calculation shows that to ensure fast clipping of the pulse, the new system, in a form of a cartridge pre-inserted in the core, shall undergo a quick pressurization from near vacuum to minimum density of 2.2 kg/m3 in less than 5 ms. The HENRI (Helium 3 Negative Reactivity Insertion) facility has been designed and built at the Oregon State University to test the feasibility of such system, design a fast response pressurization system and test the repeatability of the process. To support this task, preliminary CFD calculations are performed. In this first stage of the project, only the gas dynamics part of the process is considered. Initial results show that the ultimate atomic density could physically be reached within the 5 ms. limit assuming an ultra-fast opening device.