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Isotopes & Radiation
Members are devoted to applying nuclear science and engineering technologies involving isotopes, radiation applications, and associated equipment in scientific research, development, and industrial processes. Their interests lie primarily in education, industrial uses, biology, medicine, and health physics. Division committees include Analytical Applications of Isotopes and Radiation, Biology and Medicine, Radiation Applications, Radiation Sources and Detection, and Thermal Power Sources.
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ANS Student Conference 2025
April 3–5, 2025
Albuquerque, NM|The University of New Mexico
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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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Norway’s Halden reactor takes first step toward decommissioning
The government of Norway has granted the transfer of the Halden research reactor from the Institute for Energy Technology (IFE) to the state agency Norwegian Nuclear Decommissioning (NND). The 25-MWt Halden boiling water reactor operated from 1958 to 2018 and was used in the research of nuclear fuel, reactor internals, plant procedures and monitoring, and human factors.
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.