EUCLID: A New Approach to Improve Nuclear Data Coupling Optimized Experiments with Validation using Machine Learning [Slides]
Abstract not provided.
73 NUCLEAR PHYSICS AND RADIATION PHYSICS↗
SEARCH · Engineering Papers
Results for “Critical Experiment”
Search indexed NASA NTRS and DOE OSTI research on propulsion, heat transfer, battery materials and energy systems. Follow report and document links to the original sources.
Quote a phrase for an exact phrase match. Source license links do not imply unrestricted reuse.
Data Assimilation using Non-invasive Monte Carlo Sensitivity Analysis of Reactor Kinetics Parameters [Slides]
Sensitivity coefficients of prompt neutron decay constant (α) and effective delayed neutron fraction (β eff ) to Pu-239 nuclear data were calculated using a newly available tool (ACEtk). Uncertainty calculations showed the following trends: (1) The prompt neutron decay constant can be used to reduce nuclear data-induced uncertainty in Pu-239(n,f) and (2) the effective delayed neutron fraction can be used to effectively reduce nuclear data-induced uncertainty in Pu-239 total fission $\tilde{v}$. Sensitivity/uncertainty analysis can be used to determine optimal experiment/detector setup to identify compensating errors in nuclear data. Upcoming work includes investigating other nuclide-reaction pairs and response sensitivities, such as Δ$\rho$, neutron leakage spectra, and reaction rate measurements to constrain nuclear data of interest.
73 NUCLEAR PHYSICS AND RADIATION PHYSICS↗
Updates to the R -matrix Analyses of 233,235 U and 239 Pu; Updates to 63,65 Cu Evaluations in the RRR+URR; Current Status of 16 O Evaluation Up to 6 MeV [Slides]
Abstract not provided.
07 ISOTOPE AND RADIATION SOURCES↗
Nuclear Data for Advanced Reactors and Security Applications [Slides]
Abstract not provided.
22 GENERAL STUDIES OF NUCLEAR REACTORS↗
FAUST - Benchmark and Validation Framework [Slides]
This presentation discusses Python packages for nuclear data applications and for benchmarking. It also discusses the goals and objectives for FAUST which include providing input and output processing for different calculation codes, allowing for exchanging results between different applications and codes, running benchmarks and processing the results, automating and simplify plot and report generation, and providing a basis for developing applications useful for nuclear data evaluators. The presentation also discusses how the packages can be used both inside and outside LANL.
73 NUCLEAR PHYSICS AND RADIATION PHYSICS↗
Neutron Pulsed Die-Away Experiments at LLNL [Slides]
This presentation discusses why PNDA is ideal for TSL validations as it does not require fissile material, it has very simple target shapes and compositions, it is only sensitive to absorption and scattering of target medium, and that well conducted experiments have uncertainties of 0.1% - 0.5%. The presentation concludes by examining PNDA’s advantages and its role in nuclear data validations as it offers a cost-effective experiment for an integral benchmark, it provides the ability to focus on specific cross section data validation including thermal neutron absorption and thermal scattering laws, and the low experimental uncertainty makes it an excellent benchmark candidate. Additionally, it is easily tunable and can facilitate temperature dependent cross section validation by cooling or heating up targets.
73 NUCLEAR PHYSICS AND RADIATION PHYSICS↗
IER 518: High Multiplication Subcritical Benchmark Experiments at SNL [Slides]
This presentation discusses on high multiplication subcritical benchmark experiments at Sandia National Laboratories (SNL). The presentation highlights goals and planning, experiment setup and configuration selection, conclusions and future work.
11 NUCLEAR FUEL CYCLE AND FUEL MATERIALS↗
Oak Ridge Subcritical Assembly Final Design and Current Progress [Slides]
This presentation shows how ORSA design has moved from conceptual to implementable. Additionally, that the ORSA hands-on experiments will remain subcritical under normal and credible abnormal conditions it is fully assembled k eff = 0.95024 ± 0.0003 and USL = 0.9763. This presentation finds locations will have minimal security and safety basis impact. Available options can meet security criteria for ORSA material and Options will have less mass than the ANS-8.1 single parameter limit for 235 U either by segregation or functioning as its own facility. Further, Locations are feasible for a diversity of students and the implementation of ORSA will improve upon NCSP T&E’s vision to remain adaptable and responsive.
21 SPECIFIC NUCLEAR REACTORS AND ASSOCIATED PLANTS↗
Current Progress of the Final Design of a Subcritical Assembly at Oak Ridge National Laboratory [Slides]
This presentation shows how ORSA design has moved from conceptual to implementable. Additionally, that the ORSA hands-on experiments will remain subcritical under normal and credible abnormal conditions it is fully assembled k eff = 0.95024 ± 0.0003 and USL = 0.9763. This presentation finds locations will have minimal security and safety basis impact. Available options can meet security criteria for ORSA material and Options will have less mass than the ANS-8.1 single parameter limit for 235 U either by segregation or functioning as its own facility. Further, Locations are feasible for a diversity of students and the implementation of ORSA will improve upon NCSP T&E’s vision to remain adaptable and responsive.
21 SPECIFIC NUCLEAR REACTORS AND ASSOCIATED PLANTS↗
Quasi-Differential Neutron Scattering Measurements of 181 Ta and Teflon from 1.5 to 20 MeV [Slides]
This presentation covers motivation for the Experiments Performed. Secondly, it touches on upgrades to the Experimental Apparatus for Measurements. Thirdly, it presents quasi-Differential Experimental Methodology a) Pulse Shape Discrimination b) Validation Measurement of Carbon. The presentation concludes with Preliminary Results and Future Studies.
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND ↗
IER-479/547: Low-Temperature TEX Final Design and Surrogate Measurements [Slides]
This presentation covers the final design, and measurements of the Low-Temperature TEX. Visual Diagrams of the apparatus and detailed part explanations are included. Neutronic calculations for Low-Temperature TEX was performed. Six configurations were proposed. Thermal analysis for the boundary cases was performed. Thermal testing with surrogate materials has been underway and testing will resume shortly.
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND ↗
How to Make NCERC a go-to Destination for Shielding Benchmarks [Slides]
This talk will discuss the need and value of shielding benchmarks, discuss NCERC’s unique advantages for supporting them and ways NCERC can seize opportunity.
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND ↗
Godiva IV Shielding Benchmark Overview [Slides]
This presentation shows that Integral experiments increase the level of realism from that of data measurements. Further, Godiva IV is capable of intensities to activate foils. IER 498 uses a relative measurement to provide an intermediate level of realism. With reproducibility and room return management are key components. The test matrix put forward in CED-2 enables numerous cross-comparisons. IER 498 facilitates various additional works using a room return shield to isolate the source. IER 557 demonstrated burst reproducibility sufficient for IER 498.
21 SPECIFIC NUCLEAR REACTORS AND ASSOCIATED PLANTS↗
Godiva 4 CAAS Shielding Benchmark: Pre CED-3A Overview [Slides]
Thiis presentation shows the character of an integral experiment. It covers the question why Godiva 4? Additionally, this presentation touches on the IER 498 benchmark quantity, activities facilitated by IER 498, proposed CED-2 test matrix, and what happened during the IER 498’s gap year.
21 SPECIFIC NUCLEAR REACTORS AND ASSOCIATED PLANTS↗
Developing nonlinear laser-plasma instability models for high-fidelity, multi-physics simulation capability for ICF/HED (IC Report) [Slides]
Modeling nonlinear effects of laser plasma instabilities (LPI) is critically important for ICF/HED experiments. Our project has the following goals: • Develop physics-based nonlinear LPI models using PIC simulations • Couple the nonlinear LPI effects to macroscopic modeling of ICF/HED exp. through laser ray-tracing (LRT).
70 PLASMA PHYSICS AND FUSION TECHNOLOGY↗
IER-479/547: Low-Temperature TEX Surrogate Testing and Reflector Design [Slides]
This lecture includes a look into progress in surrogate testing. This includes a new chiller that has been fabricated and testing that has resumed. Additional tests are being conducted, including: using formed aluminum gaskets, extended testing with natural uranium, testing with pseudo-spindle, testing with no vacuum. This lecture includes a look into the Reflector Design. Results for detailed model are consistent with results presented in CED-2. Calculations provide flexibility in the physical design of the reflectors (e.g. reflector segment widths and heights). Provided initial CAD models of reflector components.
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND ↗
IER-499 Final Design of a TEX Variant: Chlorine to Support NNSA Operations [Slides]
This presentation concludes the final design of TEX with chlorine absorbers is complete. 5 configurations were identified, expected to down select to three experimental configurations. Great comparison to Y-12 and good comparison to INL sensitivities. Fastest configuration touches on the 35 Cl(n,p) cross section (continuing to work with Terrapower for faster configurations). Extensive density studies performed to ensure understanding of the salt in the plates. Reactivity studies performed to assist with experiment. Finally, the fabrication of the chlorine absorbers is ongoing (with LANL), and the experiment is scheduled to be completed this year.
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND ↗
IER 484: AFRRI Field Characterization Measurements [Slides]
This lecture includes discussion on the future work of finalizing the data analysis with dose as a function of radial distance and ion chamber integral. Further on agenda is to write manuscript of AFRRI dose characterization and write manuscripts of all NCSP-funded NAD work. Finally, it talks on the goal to publish in Radiation Measurements special issue.
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND ↗