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Conference Spotlight
Nuclear Energy Conference & Expo (NECX)
September 8–11, 2025
Atlanta, GA|Atlanta Marriott Marquis
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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Geoffrey Rothwell: My story—ANS member since 1986
When I was 10, in October 1963, my family moved to Richland, Wash., so that my father could work for Vitro-Hanford Engineering Services, later for Bechtel, on the design of the Fast Flux Test Facility. I was a “new” kid throughout my excellent education in the Richland School District. It was the mid-1960s, and I wanted to be a rocket scientist or aerospace engineer. I took all the math and science that Richland High School (RHS) had to offer. What struck me during our tour of Hanford’s N-reactor with my physics class was the loudness of the steam turbine room compared to the hydro turbine rooms in the dams along the Columbia River. I am now establishing a residence on Columbia Point Drive in Richland.
Ryota Katano, Masao Yamanaka, Cheol Ho Pyeon
Nuclear Science and Engineering | Volume 193 | Number 12 | December 2019 | Pages 1394-1402
Technical Paper | doi.org/10.1080/00295639.2019.1624084
Articles are hosted by Taylor and Francis Online.
The applicability of the linear combination method is experimentally confirmed through the pulsed neutron source (PNS) experiment. The linear combination method reduces the spatial higher-mode (HM) components in neutron flux distribution and provides one representative value of the measurement of the prompt neutron decay constant by the linear combination of the neutron counts obtained in the PNS experiment. The PNS experiment is conducted at Kyoto University Critical Assembly with deuteron-tritium source, and the neutron counts are measured at multiple detector positions. The experiment results show that the dependency of the prompt neutron decay constant on the masking time is dramatically reduced by the linear combination method compared to the conventional method: The HM components are eliminated not only by temporal decay but also by the linear combination. Through the experiment, the linear combination method can be a candidate for a practical measurement method of the prompt neutron decay constant reducing the spatial HM effects.
