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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.
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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.”
Luis E. Herranz, Virginia Peyrés, Jesús Polo, María J. Escudero, Manuel M. Espigares, José López-Jiménez
Nuclear Technology | Volume 120 | Number 2 | November 1997 | Pages 95-109
Technical Paper | Nuclear Reactor Safety | doi.org/10.13182/NT97-A35419
Articles are hosted by Taylor and Francis Online.
During some pressurized water reactor risk-dominant sequences, most of the radioactivity is discharged at very high velocities into nearly saturated pools. An experimental plan for pool scrubbing and its associated hydrodynamics under representative boundary conditions is carried out in the PECA facility. The retention tests show that a substantial fraction of particle absorption takes place at the pool entrance because of inertial removal mechanisms. This submergence-independent component of the decontamination factor (DF) becomes dominant for small submergences (S ≤ 1.25 m). The behavior of the gas at the pool entrance is investigated experimentally, and a close relation between primary bubble size and inlet gas flow is observed. In addition, the retention tests are modeled with the SPARC90 and BUSCA-AUG92 codes. SPARC90 shows fairly good agreement with the experimental data and indicates the importance of the entrance region in particle absorption. Nonetheless, the approximations and drawbacks of the aerosol removal models used in SPARC90 at the injection zone suggest the need for further separate-effects tests to validate, improve, and/or develop specific models for the entrance region and the need for additional hydrodynamic tests to better describe primary bubble behavior under a jet injection regime.