Analysis of SDDR calculation method in a large tokamak model

Žiber, Ylenia (author), Ambrožič, Klemen (author), Lengar, Igor (author)

Understanding the shutdown dose rate (SDDR) plays a crucial role in the operation and maintenance of a fusion reactor. It is particularly important to ensure the safety of personnel and the environment during maintenance and decommissioning phases. In addition, both the prediction and management of SDDR are necessary precautions in the design and operation of fusion reactors. In the present study, SDDR is investigated on a simplified model of a large tokamak to achieve a better understanding of the calculation method, the rigorous two-step method (R2S). The JSIR2S code system, based on the R2S method, is currently being developed at the Jožef Stefan Institute and combines calculations with the MCNP transport code and the FISPACT inventory code. It has been evaluated against measurements at the TRIGA fission research reactor for fission applications, and in this work it is assessed for fusion applications as well. The aim of this study is to perform SDDR calculations at different cooling times in a model of a fusion reactor using the JSIR2S code. An isotopic analysis was also carried out to identify the parent isotopes that contribute the most to the SDDR near the horizontal ports.

• Language: English
• Keywords: shutdown dose rate, JSIR2S, large tokamak
• 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: 2026
• Number of pages: 8 str.
• Numbering: Vol. 222, art. 115459
• PID: 20.500.12556/RUL-182724
• UDC: 539.1
• ISSN on article: 0920-3796
• DOI: 10.1016/j.fusengdes.2025.115459
• COBISS.SI-ID: 251661315
• Publication date in RUL: 21.05.2026

Record is a part of a journal

• Title: Fusion engineering and design
• Shortened title: Fusion eng. des.
• Publisher: Elsevier
• ISSN: 0920-3796
• COBISS.SI-ID: 15359237

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• License: CC BY 4.0, Creative Commons Attribution 4.0 International
• Link: http://creativecommons.org/licenses/by/4.0/
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