Nuclear Technology Research and Development (NTRD) Technical Monthly February FY18

Technical Report · Fri Apr 20 04:00:00 EDT 2018

DOI:https://doi.org/10.2172/1468641· OSTI ID:1468641

Bales, Tandy L. ^[1]

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1. Idaho National Lab. (INL), Idaho Falls, ID (United States)

[LANL] Energy-resolved neutron imaging data on transmutation fuels (Figure 1A) containing Am and Np were reanalyzed. The analysis using the SAMMY code was focused on retrieving absolute densities for five isotopes, 238U, 239Pu, 240Pu, 241Am and 237Np. The bulk composition described by partial densities of the main isotopes 237Np, 239Pu, 240Pu, and 242Am, resultant from the initial analysis agreed to better than 0.1 g/cc with the partial densities determined by mass spectrometry, except for 238U, which was overestimated by the initial approach. It was found that due to only a single resonance of 238U present in the fitted energy range of 1eV to 9eV (Figure 1 B), the refined areal densities for 238U were statistically insignificant, resulting in large errors. Consequently, the fitted energy range was extended to 24eV to include a second 238U resonance (Figure 1C, D), which stabilized the 238U areal densities, providing excellent agreement for all five isotopes. (A. Losko and S. Vogel)

• Research Organization: Idaho National Laboratory (INL), Idaho Falls, ID (United States)
• Sponsoring Organization: USDOE Office of Nuclear Energy (NE)
• DOE Contract Number: AC07-05ID14517
• OSTI ID: 1468641
• Report Number(s): INL/EXT--18-45255-Rev000
• Country of Publication: United States
• Language: English

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February FY18
NTRD
Nuclear Technology Research and Development
Technical Monthly