Publications

Results 27801–28000 of 96,771

Search results

Jump to search filters

sCO2 Brayton Cycle: Roadmap to sCO2 Power Cycles NE Commercial Applications

Mendez Cruz, Carmen M.; Rochau, Gary E.

The mission of the Energy Conversion (EC) area of the Advanced Reactor Technology (ART) program is to commercialize the sCO2 Brayton cycle for Advance Reactors and for the Supercritical Transformational Electric Production (STEP) program. The near-term objective of the EC team efforts is to support the development of a commercially scalable Recompression Closed Brayton Cycle (RCBC) to be constructed for the first STEP demonstration system with the lowest risk possible. This document details the status of technology, policy and market considerations, documentation of gaps and needs, and outlines the steps necessary for the successful development and deployment of commercial sCO2 Brayton Power Systems along the path to nuclear reactor applications.

More Details
TYPE SAND Report YEAR 2018
DOIOSTI

The Effects of Stochastic Velocity Variations on Estimating Time Dependent Seismic Moment Tensors: Applications to the Blue Mountain Well Perforation Data

Poppeliers, Christian P.; Preston, Leiph A.

Resolving the time dependent terms in the seismic moment tensor provides important information that can be used to interpret the source process of an explosion, including the separation of isotropic explosion terms from shear forces and potentially isolated force couples. In this report, we detail our method of inverting three component seismic data for the seismic moment tensor. We review possible seismic source models from the simplest isotropic explosion type source to those incorporating the six independent moment tensor terms. The inversion we describe is formulated in the frequency domain, and results in estimates of time dependent moment tensor components. The inversion relies on an accurate estimate of the Green's functions of the Earth. However, given the complexity of the Earth, we explore the effects of inaccuracies in the presumed Earth model used to estimate the Green's functions needed for the inversion. Specifically, we explore the effects of stochastic variations in the Earth models on the inversion results. These tests are synthetic throughout, and show that adding stochastic density/velocity heterogeneity in the presumed Earth model results in reduced amplitude seismic moment tensor estimates, as well as degrading the data misfit. We suggest two mitigation strategies. First, produce a suite of Green's functions using different realizations of the stochastic field within the Earth Model. Secondly, perform the in- version in the power spectral domain, eliminating all phase information. Finally, we analyze actual seismic data collected in winter 2017/2018. The seismic data was collected at in active geothermal well site outside of Winnimucca, NV, and was produced during well stimulation operations. In general, the inversion results were poor, with a high degree of data misfit. We hypothesize that the poor results are a function of a poorly constrained Earth model as well as noisy, high-frequency data being used in the inversion.

More Details
TYPE SAND Report YEAR 2018
DOIOSTI

Standoff Over the LRSO: Assessing the long-range stand-off missile's impact on strategic stability

Heimer, Brandon W.

While there is consensus both in the executive branch and Congress on the need to recapitalize the U.S. nuclear weapons enterprise, the delivery system and W80-4 warhead proposed to comprise the LRSO have generated considerable debate. Much of the public debate has focused on its potential to affect the strategic nuclear balance and stability. This paper seeks to elucidate both Russian and Chinese perspectives on strategic stability and apply them to a systematic analysis of how the LRSO might either enhance or diminish strategic stability for the purpose of better informing the decision-making process rather than advocate a particular position on this issue.

More Details
TYPE Other Report YEAR 2018
DOIOSTI

Assessing Magnetized Liner Inertial Fusion stagnation conditions and identifying trends

Gomez, Matthew R.; Slutz, Stephen A.; Knapp, Patrick K.; Hahn, Kelly D.; Harding, Eric H.; Ampleford, David A.; Awe, Thomas J.; Geissel, Matthias G.; Hansen, Stephanie B.; Harvey-Thompson, Adam J.; Jennings, Christopher A.; Myers, Clayton E.; Peterson, Kyle J.; Rochau, G.A.; Sinars, Daniel S.; Weis, Matthew R.; Yager-Elorriaga, David A.

Abstract not provided.

More Details
TYPE Conference Poster YEAR 2018
DOIOSTI

How to ADAPT

Jankovsky, Zachary; Haskin, Troy C.; Denman, Matthew R.

The ADAPT software allows for the examination of aleatory and epistemic uncertainties in complex system transients using the Dynamic Event Tree (DET) methodology. This manual outlines the principles of operation of ADAPT and provides directions for its use. Future plans for the code are briefly outlined.

More Details
TYPE SAND Report YEAR 2018
DOIOSTI
Results 27801–28000 of 96,771
Results 27801–28000 of 96,771