Developing Diagnostic Tools for Low-Burnup Reactor Samples
Abstract
We test common neutron fluence diagnostics in the very-low-burnup regime for natural uranium reactor samples. The fluence diagnostics considered are the uranium isotopics ratios 235U /238U and 236U/235U, for which we find that simple analytic formulas agree well with full reactor simulation predictions. Both ratios agree reasonably well with one another for fluences in the (mid -1019) - n/cm2 range. However, below about 1019 n/cm2, the concentrations of 236U are found to be sufficiently low that the measured 236U/235U ratios become unreliable. We also derive and test diagnostics to determine the cooling times in situations where very low burnup and very long cooling times render many standard diagnostics impractical, such as the 241Am /241Pu ratio. Here, we find that using several fragment ratios is necessary to detect the presence of systematic errors such as fractionation.
- Authors:
-
- Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
- Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Louisiana State Univ., Baton Rouge, LA (United States). Dept. of Geology and Geophysics
- Publication Date:
- Research Org.:
- Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
- Sponsoring Org.:
- USDOE Laboratory Directed Research and Development (LDRD) Program
- OSTI Identifier:
- 1504647
- Alternate Identifier(s):
- OSTI ID: 1406152
- Report Number(s):
- LA-UR-16-26969
Journal ID: ISSN 2331-7019; PRAHB2
- Grant/Contract Number:
- 89233218CNA000001
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physical Review Applied
- Additional Journal Information:
- Journal Volume: 8; Journal Issue: 4; Journal ID: ISSN 2331-7019
- Publisher:
- American Physical Society (APS)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 73 NUCLEAR PHYSICS AND RADIATION PHYSICS
Citation Formats
Jaffke, Patrick John, Byerly, Benjamin, Doyle, Jamie, Hayes-Sterbenz, Anna Catherine, Jungman, Gerard, Myers, Steven Charles, Olson, Angela Christine, Porterfield, Donivan R., and Tandon, Lav. Developing Diagnostic Tools for Low-Burnup Reactor Samples. United States: N. p., 2017.
Web. doi:10.1103/PhysRevApplied.8.044025.
Jaffke, Patrick John, Byerly, Benjamin, Doyle, Jamie, Hayes-Sterbenz, Anna Catherine, Jungman, Gerard, Myers, Steven Charles, Olson, Angela Christine, Porterfield, Donivan R., & Tandon, Lav. Developing Diagnostic Tools for Low-Burnup Reactor Samples. United States. https://doi.org/10.1103/PhysRevApplied.8.044025
Jaffke, Patrick John, Byerly, Benjamin, Doyle, Jamie, Hayes-Sterbenz, Anna Catherine, Jungman, Gerard, Myers, Steven Charles, Olson, Angela Christine, Porterfield, Donivan R., and Tandon, Lav. Tue .
"Developing Diagnostic Tools for Low-Burnup Reactor Samples". United States. https://doi.org/10.1103/PhysRevApplied.8.044025. https://www.osti.gov/servlets/purl/1504647.
@article{osti_1504647,
title = {Developing Diagnostic Tools for Low-Burnup Reactor Samples},
author = {Jaffke, Patrick John and Byerly, Benjamin and Doyle, Jamie and Hayes-Sterbenz, Anna Catherine and Jungman, Gerard and Myers, Steven Charles and Olson, Angela Christine and Porterfield, Donivan R. and Tandon, Lav},
abstractNote = {We test common neutron fluence diagnostics in the very-low-burnup regime for natural uranium reactor samples. The fluence diagnostics considered are the uranium isotopics ratios 235U /238U and 236U/235U, for which we find that simple analytic formulas agree well with full reactor simulation predictions. Both ratios agree reasonably well with one another for fluences in the (mid -1019) - n/cm2 range. However, below about 1019 n/cm2, the concentrations of 236U are found to be sufficiently low that the measured 236U/235U ratios become unreliable. We also derive and test diagnostics to determine the cooling times in situations where very low burnup and very long cooling times render many standard diagnostics impractical, such as the 241Am /241Pu ratio. Here, we find that using several fragment ratios is necessary to detect the presence of systematic errors such as fractionation.},
doi = {10.1103/PhysRevApplied.8.044025},
journal = {Physical Review Applied},
number = 4,
volume = 8,
place = {United States},
year = {Tue Oct 31 00:00:00 EDT 2017},
month = {Tue Oct 31 00:00:00 EDT 2017}
}
Web of Science
Figures / Tables:
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