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Shutdown dose rates in-cryostat outside the EU-DEMO vacuum vessel

Berry, T. A.; Eade, T.; Bachmann, C.; Čufar, A.; Franke, T.; Gliss, C.; Leichtle, D. ORCID iD icon 1; Vorpahl, C.
1 Institut für Neutronenphysik und Reaktortechnik (INR), Karlsruher Institut für Technologie (KIT)

Abstract:

Future fusion reactors using deuterium–tritium fuel will exhibit high fluences of high-energy neutrons inside and around the reactor vacuum vessel (VV). As well as causing material damage, fusion neutrons will activate materials, the decay of which leads to radiation fields in and around the reactor after shutdown. Gamma- ray emission from activated materials is a particular radiological hazard during periods of reactor shutdown. This must be accounted for in the design of the reactor shielding to ensure that risks are reduced as low as reasonably achievable. Recent neutronics work has evaluated the shutdown dose rates (SDDRs) in the EU DEMOnstration power plant (DEMO) around the ports and throughout the cryostat, incorporating prospective shielding improvements to the VV and ports. Prior to the proposed shielding design improvements, calculations for the model including the helium-cooled pebble bed (HCPB) blanket showed that radiation leakage through the blanket and VV leads to biological-equivalent SDDRs (following 12 days’ decay) above 10$^3$ μSv/h throughout the cryostat, ignoring additional contribution from radiation streaming through the port openings. ... mehr


Verlagsausgabe §
DOI: 10.5445/IR/1000160474
Veröffentlicht am 12.07.2023
Originalveröffentlichung
DOI: 10.1016/j.fusengdes.2023.113619
Scopus
Zitationen: 1
Dimensions
Zitationen: 1
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Neutronenphysik und Reaktortechnik (INR)
Publikationstyp Zeitschriftenaufsatz
Publikationsmonat/-jahr 08.2023
Sprache Englisch
Identifikator ISSN: 0920-3796
KITopen-ID: 1000160474
HGF-Programm 31.13.05 (POF IV, LK 01) Neutron-Resistant Structural Materials
Erschienen in Fusion Engineering and Design
Verlag Elsevier
Band 193
Seiten Art.-Nr.: 113619
Vorab online veröffentlicht am 02.06.2023
Schlagwörter Neutronics, Safety, Shielding, Radiological zoning, Shutdown dose rate
Nachgewiesen in Dimensions
Web of Science
Scopus
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