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High-Level Considerations for Access and Access Controls by Design

Bland, Jesse J.; Evans, Alan S.; Goolsby, Tommy D.W.; Horowitz, Steven M.; Monthan, Chad W.; Osborn, Douglas; Rivers, Joe; Rodgers, Thomas W.; White, Jake; Williams, Adam D.

The design and construction of a nuclear power plant must include robust structures and a security boundary that is difficult to penetrate. For security considerations, the reactors would ideally be sited underground, beneath a massive solid block, which would be too thick to be penetrated by tools or explosives. Additionally, all communications and power transfer lines would also be located underground and would be fortified against any possible design basis threats. Limiting access with difficult-to-penetrate physical barriers is a key aspect for determining response and staffing requirements. Considerations considered in a graded approach to physical protection are described.

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TYPE Other Report YEAR 2020
DOIOSTI

Spray Combustion and Soot Formation

Manin, Julien L.; Pickett, Lyle M.

Mitigating particulate matter (PM) emissions while simultaneously controlling nitrogen oxide and hydrocarbon emissions is critical for both gasoline and diesel engines. The problem is especially critical during cold-start cycles where aftertreatment devices are less effective. Understanding how liquid sprays and films form PM and designing to change the outcome requires advanced combustion concepts developed through joint experimental and computational efforts. However, existing spray and soot computational models are oversimplified and non-physical, and are therefore unable to reliably capture quantitative or even qualitative trends over a wide range of engine operating conditions. This task involves the development and application of advanced optical diagnostics and high-pressure gas and particle sampling/analysis in unique high-temperature, high-pressure vessels to investigate spray dynamics and soot formation with the objective of providing fundamental understanding about soot processes under relevant engine conditions to aid the development of improved soot models for commercial CFD codes

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TYPE Other Report YEAR 2020
DOIOSTI

Development of High-Voltage Vertical GaN PN Diodes (invited)

Kaplar, Robert; Gunning, Brendan P.; Allerman, A.A.; Crawford, Mary H.; Flicker, Jack D.; Armstrong, Andrew A.; Yates, Luke; Binder, Andrew; Dickerson, Jeramy; Pickrell, Gregory W.; Sharps, Paul; Anderson, T.; Gallagher, J.; Jacobs, A.; Koehler, A.; Tadjer, M.; Hobart, K.; Ebrish, M.; Porter, M.; Martinez, R.; Zeng, K.; Ji, D.; Chowdhury, S.; Aktas, O.; Cooper, James A.

Abstract not provided.

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TYPE Conference Presenation YEAR 2020
DOIOSTI
Results 14401–14500 of 99,299
Results 14401–14500 of 99,299