Activation analysis of the European DEMO divertor with respect to the different breeding blanket segmentation

Tidikas, Andrius; Stankūnas, Gediminas

doi:10.1016/j.fusengdes.2020.112012

Cited by 1 publication

(8 citation statements)

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“…ILW contains the amount of The total activity of the liner and reflector plates from the beginning of cooling time until 1000 years is decreasing from 2.103 × 10 17 Bq to 4.336 × 10 11 Bq in the case of the HCPB concept. A similar trend can be observed for different materials independently, where the decrease (for the time interval from 0 s to 1000 years) is observed for the following: From both calculations, the same material (tungsten and Eurofer) nuclide analysis showed that the identical nuclides are most dominant at the same time, despite the fact that parts with Eurofer are mixed with water in previous calculations [43]. As for activity calculations, a comparison between this work and older estimates could be made with the These results have shown that the activation significantly decreased.…”

Section: Resultssupporting

confidence: 79%

“…The activity of the 3 mm layer in this work is approximately six times higher than the first layer in Ref. [43], up to ten years of cooling. If we consider a later time interval, the activation values in Ref.…”

contrasting

confidence: 45%

“…If we consider a later time interval, the activation values in Ref. [43] are lower by approximately two orders of magnitude for the first layer of divertor. This is due to the use of different nuclear data libraries.…”

mentioning

confidence: 89%

“…Layer 4 was made of EUROFER steel and water [43]. From both calculations, the same material (tungsten and Eurofer) nuclide analysis showed that the identical nuclides are most dominant at the same time, despite the fact that parts with Eurofer are mixed with water in previous calculations [43]. As for activity calculations, a comparison between this work and older estimates could be made with the first layer, i.e., tungsten materials.…”

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confidence: 91%

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confidence: 99%

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Activities in Divertor Reflector and Linear Plates Using WCLL and HCPB Breeding Blanket Concepts

Breidokaité

Stankūnas

2021

Energies

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In fusion devices, such as European Demonstration Fusion Power Reactor (EU DEMO), primary neutrons can cause material activation due to the interaction between the source particles and the targeting material. Subsequently, the reactor’s inner components become activated. For safety and safe performance purposes, it is necessary to evaluate neutron-induced activities. Activities results from divertor reflector and liner plates are presented in this work. The purpose of liner shielding plates is to protect the vacuum vessel and magnet coils from neutrons. As for reflector plates, the function is to shield the cooling components under plasma-facing components from alpha particles, thermal effects, and impurities. Plates are made of Eurofer with a 3 mm layer of tungsten, while the water is used for cooling purposes. The calculations were performed using two EU DEMO MCNP (Monte Carlo N-Particles) models with different breeding blanket configurations: helium-cooled pebble bed (HCPB) and water-cooled lithium lead (WCLL). The TENDL–2017 nuclear data library has been used for activation reactions cross-sections and nuclear reactions. Activation calculations were performed using the FISPACT-II code at the end of irradiation for cooling times of 0 s–1000 years. Radionuclide analysis of divertor liner and reflector plates is also presented in this paper. The main radionuclides, with at least 1% contribution to the total value of activation characteristics, were identified for the previously mentioned cooling times.

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Section: Resultssupporting

confidence: 79%

contrasting

confidence: 45%

mentioning

confidence: 89%

mentioning

confidence: 91%

mentioning

confidence: 99%

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