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Organized to promote the advancement of knowledge in the use of nuclear science and technologies in the aerospace application. Specialized nuclear-based technologies and applications are needed to advance the state-of-the-art in aerospace design, engineering and operations to explore planetary bodies in our solar system and beyond, plus enhance the safety of air travel, especially high speed air travel. Areas of interest will include but are not limited to the creation of nuclear-based power and propulsion systems, multifunctional materials to protect humans and electronic components from atmospheric, space, and nuclear power system radiation, human factor strategies for the safety and reliable operation of nuclear power and propulsion plants by non-specialized personnel and more.
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Nuclear Energy Conference & Expo (NECX)
September 8–11, 2025
Atlanta, GA|Atlanta Marriott Marquis
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NRC cuts fees by 50 percent for advanced reactor applicants
The Nuclear Regulatory Commission has announced it has amended regulations for the licensing, inspection, special projects, and annual fees it will charge applicants and licensees for fiscal year 2025.
F. B. Simpson, J. W. Codding, Jr.
Nuclear Science and Engineering | Volume 28 | Number 1 | April 1967 | Pages 133-138
Technical Paper | doi.org/10.13182/NSE67-A18676
Articles are hosted by Taylor and Francis Online.
Transmission measurements on 233Pa have been taken with the Materials Testing Reactor (MTR) fast chopper. The total cross section has been calculated in the energy range from 0.01 to 10 000 eV. These measurements were made on 700 mg of chemically separated 233Pa in an oxide form. The protactinium was produced by irradiating 280 g of 232Th in the Engineering Test Reactor (ETR). The sample represented approximately 15 000 Ci of activity. The data were taken with a resolution of 0.08 to 2.0 μsec/m. The Breit-Wigner (B-W) resonance parameters have been obtained for the resonances below 18 eV. The average parameters give a value of 0.75 × 10 −4 for the s-wave neutron strength function . Weighting the level spacings inversely as 2J + 1 gives the average observed level spacings per spin state of 1.10 and 1.84 eV. A second-order polynomial least-squares fit to the data between 0.01 and 0.10 eV gives a 2200 m/sec total neutron cross section of 55 ± 3 b, superseding a value of 57 b given previously. The resonance-absorption integral for neutrons with energies above 0.4 eV was calculated to be 901 ± 45 b.
