Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 8 of 8 for “"Helium Production"”.
-
Fuel Cycle Modeling Improvements and Multi-Tiered Recycling With A Sodium-Cooled Heterogeneous Innovative Burner Reactor
… When studying transmutation in these rods, helium production from α-decay must be considered since helium is produced in substantial quantities. This research utilized an innovative method to calculate gas production by modifying the CINDER90 depletion code used by MCNPX 2.6.0 to include …
-
Multi-scale investigations of the Resistance to helium embrittlement with Direct Energy Deposited Inconel 718
To address the high levels of helium production in advanced fission and fusion reactors, in an economical manner, Direct Energy Deposition (DED) was utilized with the existing alloy, Inconel 718. Based on previous works with DED and laser welding, it was hypothesized that nano-sized pores could be …
-
Neutron dosimetry, moderated energy spectrum, and neutron capture therapy for ²⁵{45}R²Cf medical sources
… Issues such as capsule burst strength due to helium production for a variety of proposed HDR sources were addressed. A recommended 252Cf source strength of at least 1 mg was necessary for fabrication of a 252Cf HDR source.
-
Deuterium Retention and Trapping in Polycrystalline Tungsten under Simultaneous Implantation of Deuterium with Helium and with Neon
… the deuterium-tritium phase of operations. Helium production from DT fusion reactions will influence W surface roughness, and D and T retention in the W. Neon is a candidate for radiative cooling, to prevent melting, however little research exists on its effects on D retention in W. Using …
-
Intermediate energy proton irradiation: An experimental and analytical foundation for bulk radiation damage testing
… highlights the ability to emulate fusion helium production levels of 10-30 ppm for common metals, where fission reactors cannot. Specifically for tungsten irradiation, protons are able to induce damage without confounding solid transmutation levels such as the 5% rhenium/dpa of high flux …
-
Silicon carbide performance as cladding for advanced uranium and thorium fuels for light water reactors
… changing the gap bond material from helium to lead-bismuth eutectic (LBE) and adding a central void in the fuel pellet. In addition, the consequences of using thorium oxide (ThO₂) as host matrix for plutonium oxide (PuO₂) were covered. The effects of cladding thickness on fuel …
-
A Microstructural Evaluation of Fast Flux Irradiated Fe-15Cr-xNi-yP Alloys at 490 C to 6.7 DPA
Made available in DSpace on 2017-07-06T18:55:25Z (GMT). No. of bitstreams: 3 Mitchell_Matthew_A_MS.pdf: 79197544 bytes, checksum: 27064a7ca0cb026a80c44393663dcefb (MD5) Mitchell_Matthew_A_MS_ABS.pdf: 1036519 bytes, checksum: 174253e3ad2776f3ad21e199b6eccfbc (MD5) license.txt: 4813 bytes, checksum: …
-
Diffusion of helium isotopes in silicate glasses and minerals : implications for petrogenesis and geochronology
Helium mobility in geologic materials is a fundamental constraint on the petrogenetic origins of helium isotopic variability and on the application of radiogenic and cosmogenic helium geochronology. 3He and 4He volume diffusivities determined at 25-600°C in basaltic glasses by incremental-heating …