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Radiation dose assessment of 7Be and activated corrosion products present in the hydrogen trap of IFMIF-DONES lithium system

Martínez-Serrano, J. Javier ; Qiu, Yuefeng 1; Dézsi, Tamás; Nitti, Francesco Saverio; Ibarra, Angel
1 Institut für Neutronenphysik und Reaktortechnik (INR), Karlsruher Institut für Technologie (KIT)

Abstract:

The radiological impact that 7Be and activated corrosion products (ACP) dissolved in Li could have in normal
operation and maintenance in the surroundings of the hydrogen trap (HT) of future IFMIF-DONES facility has
been assessed. Ambient dose equivalent rates were calculated with radiation transport program MCNP at half
height of trap. Four different Y contents were considered in the trap: 1, 3, 5 and 8 kg. In normal operation dose
rates in the range 13.7–15.1 mSv/h have been found in contact with the trap and 0.28–0.31 mSv/h at 1 m of the
trap. 7Be has a very low contribution to dose (3–3.7 μSv/h). Dose simulations have shown that a concrete wall 30
cm thick can reduce dose rates to acceptable dose limits. In maintenance operation the trap is drained and Li film
remains attached to Y pebbles. Three possible Li film thickness have been considered: 10, 50 and 100 μm.
Estimated 7Be activity is below exemption limits during maintenance. Assessed dose rates are in the range
34–1420 μSv/h at contact with the trap and a maximum of 10.9 μSv/h at 1 m of the trap.


Verlagsausgabe §
DOI: 10.5445/IR/1000168856
Veröffentlicht am 04.03.2024
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Neutronenphysik und Reaktortechnik (INR)
KIT-Bibliothek (BIB)
Publikationstyp Zeitschriftenaufsatz
Publikationsmonat/-jahr 04.2024
Sprache Englisch
Identifikator ISSN: 0920-3796, 1873-7196
KITopen-ID: 1000168856
HGF-Programm 31.13.05 (POF IV, LK 01) Neutron-Resistant Structural Materials
Erschienen in Fusion Engineering and Design
Verlag Elsevier
Band 201
Seiten Art.-Nr.: 114269
Vorab online veröffentlicht am 17.02.2024
Nachgewiesen in Web of Science
Dimensions
Scopus
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