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Division Spotlight
Radiation Protection & Shielding
The Radiation Protection and Shielding Division is developing and promoting radiation protection and shielding aspects of nuclear science and technology — including interaction of nuclear radiation with materials and biological systems, instruments and techniques for the measurement of nuclear radiation fields, and radiation shield design and evaluation.
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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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.”
Julio Diaz, Robert Adams, Victor Petrov, Annalisa Manera (Univ of Michigan)
Proceedings | Advances in Thermal Hydraulics 2018 | Orlando, FL, November 11-15, 2018 | Pages 241-249
The work presented in this report describes the current status of the High-Resolution Gamma-ray Tomography System (HRGTS) under development at the University of Michigan (UM) for high-resolution measurements of void fractions in complex geometries such as fuel bundles and high-pressure test sections, including various test measurements. The system consists of a high-resolution fan-beam gamma tomography system based on an Ir-192 source and a custom modular detector array. The module arrangement is composed of eight detectors, each consisting of a LYSO (Lu1.9Y0.1SiO5) scintillator read out by two Silicon Photomultipliers (SiPMs) arranged in parallel for improved light collection. Custom pulse-processing electronic boards for each module amplify the analog signals and count events at two independently-defined pulse height thresholds per detector. The individual detector modules have WiFi capabilities so that the detector arc can be easily expanded, requiring only a single PC to operate the entire array remotely. Reconstructed images of test phantoms have confirmed a spatial resolution of about 1.5 mm. Further tests were performed using a static mock-up of a 5x5 fuel assembly. The complete detector arc is mounted on a rotating stage with a large inner hole of 470 mm in order to accommodate flow channels, such that the source and detector are rotated around the stationary channel in order to collect the range of projection angles needed to perform tomographic reconstruction.