J. Shimwell S. Lilley L. Morgan L. Packer M. Kovari S. Zheng J. McMillan
Beryllium (Be) is a precious resource with many high value uses, the low energy threshold (n,2n) reaction makes Be an excellent neutron multiplier for use in fusion breeder blankets. Estimates of Be requirements and available resources suggest that this could represent a major supply difficulty for solid-type blanket concepts. Reducing the quantity…
Preprint PublishedJ. Shimwell L. Morgan S. Lilley T. Eade M. Kovari S. Zheng J. McMillan
High energy neutrons produced in future fusion reactors will cause significant transmutation reactions in the breeder blanket, including the important tritium breeding reactions. The reaction rate for a given reaction type depends on the neutron spectrum and material properties. The inventory consequences fortritium production of a solid-type breed…
Preprint PublishedM. R. Gilbert S. Zheng R. Kemp L. W. Packer S. L. Dudarev J.-Ch. Sublet
A key goal for fusion materials modelling research is the development of predictive simulation models and capabilities to assess material performance under the neutron irradiation conditions expected in near-plasma regions of fusion reactor tokamaks. This paper presents computational results from the modelling of neutron fields in the latest concep…
PublishedA. Turner R. Pampin M.J. Loughlin Z. Ghani G. Hurst A. Lo Bue S. Mangham A. Puiu S. Zheng
The In-Vessel Viewing System (IVVS) units proposed for ITER are deployed to perform in-vessel examination. During plasma operations, the IVVS is located beyond the vacuum vessel, with shielding blocks envisaged to protect components from neutron damage and reduce shutdown dose rate (SDR) levels. Analyses were conducted to determine the effectivenes…
PublishedM.R. Gilbert S.L. Dudarev S. Zheng L.W. Packer J.-Ch. Sublet
The high-energy, high-intensity neutron fluxes produced by the fusion plasma will have a significant life-limiting impact on reactor components in both experimental and commercial fusion devices. As well as producing defects, the neutrons bombarding the materials initiate nuclear reactions, leading to transmutation of the elemental atoms. Products …
PublishedS. Zheng R. Pampin S. Lilley B. C. Na M. J. Loughlin N. P. Taylor V. Barabash
The scope, methodology, and preliminary results are presented of a series of neutron transport and activation analyses aimed at updating the ITER radioactive inventory assessment and assisting the waste management planning. Calculations are performed using stateof-the-art three-dimensional models, codes, and data libraries and thereby overcoming ea…
PublishedM.R. Gilbert S.L. Dudarev S. Zheng L.W. Packer J.-Ch. Sublet
In a fusion reactor, materials will be subjected to significant fluxes of high-energy neutrons. As well as causing radiation damage, the neutrons also initiate nuclear reactions leading to changes in the chemical composition of materials (transmutation). Many of these reactions produce gases, particularly helium, which cause additional swelling and…
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