ANS is committed to advancing, fostering, and promoting the development and application of nuclear sciences and technologies to benefit society.
Explore the many uses for nuclear science and its impact on energy, the environment, healthcare, food, and more.
Division Spotlight
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.
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!
Latest Magazine Issues
Jul 2024
Jan 2024
Latest Journal Issues
Nuclear Science and Engineering
August 2024
Nuclear Technology
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.”
Ola Thomson, Ninos S. Garis,†, Imre Pázsit
Nuclear Technology | Volume 120 | Number 1 | October 1997 | Pages 71-80
Technical Paper | Reactor Operation | doi.org/10.13182/NT97-A35432
Articles are hosted by Taylor and Francis Online.
Detecting the vibration and impacting of neutron detectors in boiling water reactor cores is usually attempted from the detector signals. Two such indicators used or suggested earlier are the widening of the vibration peak in the detector noise auto-power spectral density and the deviation from Gaussian ( = “distortion”) of the signal amplitude probability distribution (APD). Quantification of both methods is hindered by the presence of a strong, Gaussian background; thus, it was thought that band-pass filtering around the vibration peak would improve the performance of the methods. This suggestion has been investigated. It turns out that filtering reduces the background, but it also distorts the vibration component of the signal. For good performance, this latter effect must be compensated for. Such methods are elaborated and applied to both peak widening and APD distortion techniques. It was found that application of such techniques makes the kurtosis and the decay ratio associated with the signal suitable to be used as quantitative indicators of impacting. The methods elaborated were also checked by numerical simulations and real measurements with positive results.