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Nuclear Energy Conference & Expo (NECX)
September 8–11, 2025
Atlanta, GA|Atlanta Marriott Marquis
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Powering the future: How the DOE is fueling nuclear fuel cycle research and development
As global interest in nuclear energy surges, the United States must remain at the forefront of research and development to ensure national energy security, advance nuclear technologies, and promote international cooperation on safety and nonproliferation. A crucial step in achieving this is analyzing how funding and resources are allocated to better understand how to direct future research and development. The Department of Energy has spearheaded this effort by funding hundreds of research projects across the country through the Nuclear Energy University Program (NEUP). This initiative has empowered dozens of universities to collaborate toward a nuclear-friendly future.
Katsuhei Kobayashi, Itsuro Kimura, Takamasa Mori
Nuclear Science and Engineering | Volume 99 | Number 2 | June 1988 | Pages 157-171
Technical Paper | doi.org/10.13182/NSE88-A23556
Articles are hosted by Taylor and Francis Online.
To make an integral check of the evaluated nuclear data for thorium in ENDF/B-IV, ENDF/B- V, and JENDL-2, the energy spectra of angular neutron fluxes calculated with these data bases were compared with those measured in a spherical thoria pile and from a metallic thorium slab by the Linac time-of-flight method in the 1-keV to 10-MeV energy range. The calculations were performed using the Sn code DTF-IV and the Monte Carlo code MCNP. General agreement can be seen between the measurement and the calculation with the above three data bases. In particular, the calculation with ENDF/B-V data shows best agreement with the measurement for the thoria pile at energies above ∼4 MeV. However, the calculations using the ENDF/B-V and JENDL-2 data under-predicted the measurement by 30 to 40% in the energy region from several hundred kilo-electron-volts to a few mega-electron-volts. Sensitivity analysis for the neutron spectra in the above pile and from the slab was also carried out, and the results showed that both of the spectra were sensitive to the total and inelastic scattering cross sections. To determine the reason for the discrepancy between the measured and calculated spectra, the partial cross-section data in ENDF/B-V or JENDL-2 were substituted by those in ENDF/B-IV. The spectra calculated by replacing the inelastic scattering data for thorium in ENDF/ B- V or JENDL-2 by those in ENDF/B-IV have shown good agreement with the ENDF/B-IV-based spectrum, which is rather close to the measurements found in all relevant energy regions.
