Evaluation of neutron dose rates at the TCV tokamak facility

Fortuna, Mark (author), Žohar, Andrej (author), Snoj, Luka (author)

A detailed MCNP neutronics model of the building housing the TCV tokamak has been developed. Predicted dose rates have been compared to neutron dose measurements at 12 locations in the building obtained during neutral beam injection into TCV plasmas. This work was motivated both by the necessity to understand neutron transport in a complex environment and to provide an adequate reference model of the building to which additional shielding can be added. The additional shielding is required because of an expected 5-10 fold increase of neutron doses by the addition of a second neutral beam source. The neutron source was estimated using the TRANSP code. Starting from a simple model, which left out or simplified many important structures, the model was iteratively refined. The discrepancies between the predicted and measured doses decreased significantly, down to less than a factor 2 for most of the locations calculated by the most detailed model. A factor 2 is believed to be within the combined errors resulting from uncertainties in the neutron source model, the detector calibration and the uncertainties stemming from the model itself.

• Language: English
• Keywords: tokamak, neutron transport, shielding TCV, experimental validation, dose rate, neutron, MCNP
• Work type: Article
• Typology: 1.01 - Original Scientific Article
• Organization: FMF - Faculty of Mathematics and Physics
• Publication status: Published
• Publication version: Version of Record
• Year: 2023
• Number of pages: 9 str.
• Numbering: Vol. 191, art. 113562
• PID: 20.500.12556/RUL-148313-d8f3a481-6522-071f-f8f5-805bc0fbc9f1
• UDC: 539.1
• ISSN on article: 1873-7196
• DOI: 10.1016/j.fusengdes.2023.113562
• COBISS.SI-ID: 143415299
• Publication date in RUL: 11.08.2023

Record is a part of a journal

• Title: Fusion engineering and design
• Publisher: Elsevier
• ISSN: 1873-7196
• COBISS.SI-ID: 23146245

Licences

• License: CC BY-NC-ND 4.0, Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International
• Link: http://creativecommons.org/licenses/by-nc-nd/4.0/
• Description: The most restrictive Creative Commons license. This only allows people to download and share the work for no commercial gain and for no other purposes.

Secondary language

• Language: Slovenian
• Keywords: tokamak, transport nevtronov, ščitenje TCV, ekserimentalna validacija, hitrost doze, nevtroni

Projects

• Funder: ARRS - Slovenian Research Agency
• Project number: P2-0073
• Name: Reaktorska fizika

• Funder: ARRS - Slovenian Research Agency
• Project number: P2-0405
• Name: Fuzijske tehnologije