Benchmark evaluation of one dimensional array of HEU moderated and reflected by Lucite
- Jozef Stefan Institute, Jamova 39, SI-1000, Ljubljana (Slovenia)
- Los Alamos National Laboratory, Los Alamos, NM 87545 (United States)
The evaluation of two HEU-Lucite experiments is presented. The critical experiments were performed using the Planet Universal Critical Assembly Machine at Los Alamos National Laboratory in 2019. In these experiments, HEU foils were interleaved with Lucite in a column stack and were moderated and reflected from the square Lucite plates. The neutron data produced were used to approximate the multiplication of each measured configuration. The evaluation of the experiments using calculational techniques is presented in the paper. A Monte-Carlo computational model to be used with MCNP6 was developed for the determination of uncertainties and the effects of various uncertainties on the multiplication factor were studied. The evaluation of the benchmark was performed for comparison of calculation results with the experimental data and validation of calculation techniques in particular the newly available thermal scattering data for the Lucite material. The sensitivity studies include parametric variations of material composition and geometry. Experimental uncertainties were low, with the overall height of the HEU/Lucite stack being the largest contributor to the overall uncertainty in k{sub eff}. (authors)
- Research Organization:
- American Nuclear Society - ANS, La Grange Park, IL 60526 (United States)
- OSTI ID:
- 23203911
- Country of Publication:
- United States
- Language:
- English
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