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UKAEA-CCFE-PR(26)4682025
Diamond has several possible applications within fusion reactors, including windows, sensors/diagnostics and has shown promise as a plasma facing material. For some of these applications, polycrystalline diamond may be preferable to single crystal, meaning the impact of grain boundaries on retention mechanisms needs to be understood. As such, this …
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UKAEA-CCFE-PR(26)4652024
Deuterium retention was measured in beryllium samples from the JET ITER-like wall limiter tiles that were in the JET vessel for one and three campaigns (in vessel during 2015-2016 and 2011-2016, respectively), using thermal desorption spectroscopy, ion beam analysis and secondary ion mass spectrometry. It was found that overall retention increas…
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UKAEA-CCFE-PR(26)4612024
Self-passivating W-11.4Cr-0.6Y (in wt.%) alloy is the plasma-facing armour material candidate in fusion power plants. In the present work, the as-sintered material, fabricated via ball milling and field-assisted sintering, was annealed at 1000℃ for varying durations to induce phase decomposition. This process leads to the transformation of the in…
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UKAEA-CCFE-PR(26)4522024
Alloy X-750 was exposed to a 480 °C CO-CO2 reducing gas mixture at an oxygen partial pressure below the NiO dissociation pressure. Post-exposure analytical transmission electron microscopy (ATEM) analysis confirmed the occurrence of preferential intergranular oxidation (PIO) and internal oxidation which resulted in the formation of N…
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UKAEA-CCFE-PR(26)4462023
This work investigated the impact of electron beam (EB) welding, and in particular varying the transverse speed of the electron beam (i.e. 1200-2200 mm/min), on the resultant microstructure of PM2000 ODS steel, using analytical electron microscopy and microhardness. The resultant range of heat inputs during welding explored in this study (72-39 J/m…
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UKAEA-CCFE-PR(26)4422023
We present a computational study employing Object Kinetic Monte Carlo simulations to investigate the behavior of D in self-irradiated Mo samples. Our simulations reveal that vacancy clusters contributing significantly to D diffusion, trapping, and desorption behavior. It is found that vacancy clusters play an important role in slowing the diffus…
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UKAEA-CCFE-PR(26)4382022
Silicon carbide (SiC) has attractive properties to be used in nuclear reactors and other industries. However, itis hampered by inherent brittleness that is overcome with a fiber-reinforced composite. A finite element modelbased on cohesive zone contact coupled to Coulomb friction is proposed to simulate the pushout responseof isolated fibers in SiC…
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UKAEA-CCFE-PR(26)4272025
Reduced activation ferritic-martensitic (RAFM) steels are a recent class of radiation-resistant steels designed for the structural components of power-producing fusion reactors. In this work an advanced (A)RAFM steel has been developed with superior radiation hardening resistance with respect to the EUROFER-97 upon which it was based. 4D-STEM (s…
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UKAEA-CCFE-CP(26)392023
This paper sets out what needs to be considered when considering a Funded Decommissioning Programme (FDP). In the UK a FDP is submitted to the secretary of state for approval as a requirement for a nuclear site licensee to install or operate a nuclear power station. The United Kingdom Atomic Energy Authority (UKAEA) Spherical Tokamak for Energy …
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UKAEA-CCFE-PR(26)4182025
Future fusion power plants require structural materials that can withstand extreme operating conditions, including high coolant outlet temperatures, mechanical loading, and radiation damage. Reduced-activation ferritic martensitic (RAFM) steels are a primary candidate as a structural material for such applications. This study demonstrates the succe…
Showing 1 - 10 of 208 UKAEA Paper Results