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Division Spotlight
Nuclear Installations Safety
Devoted specifically to the safety of nuclear installations and the health and safety of the public, this division seeks a better understanding of the role of safety in the design, construction and operation of nuclear installation facilities. The division also promotes engineering and scientific technology advancement associated with the safety of such facilities.
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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Nuclear Technology
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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.”
I. Murata, H. Miyamaru, I. Kato, S. Yoshida, Y. Mori
Nuclear Technology | Volume 168 | Number 2 | November 2009 | Pages 373-377
Neutron Measurements | Special Issue on the 11th International Conference on Radiation Shielding and the 15th Topical Meeting of the Radiation Protection and Shielding Division (Part 2) / Radiation Measurements and Instrumentation | doi.org/10.13182/NT09-A9212
Articles are hosted by Taylor and Francis Online.
Accelerator-based neutron sources are being developed worldwide. In a neutron source, it is essential to know the characteristics of the field including neutrons and gamma rays. However, for the neutron, it is still difficult to measure the energy spectrum below 10 keV. In the present study, a low-energy neutron spectrometer has been designed and developed to examine the accelerator-based neutron source performance. The proposed spectrometer will finally cover neutron energy from the thermal-to-kilo-electron-volt region and is based on a 3He proportional counter. It is positioned in parallel with the incident neutron beam, and the reaction depth distribution is measured. Since the reaction depth distribution varies depending on the incident neutron energy, it can be converted to the neutron energy spectrum. The spectrometer is 50 cm long × 5 cm in diameter with a gas pressure of 0.5 MPa. Recently, a prototype detector was completed, and the signal test is now in progress. The preliminary test result has described the present spectrometer availability as a low-energy neutron spectrometer for an accelerator-based neutron source. Because this kind of spectrometer did not exist heretofore, the spectrometer can be applied to neutron source facilities, e.g., proton accelerators like the Japan Proton Accelerator Research Complex (J-PARC) and nuclear reactors as well as accelerator-based neutron sources for boron neutron capture therapy like the fixed field alternating gradient-emittance-energy recovery internal target (FFAG-ERIT).