General Design of the Neutral Beam Injection System and Integration with ITER  The disclaimer contained in ITER Publications Procedures S AC PP 1 93–10–12 W2 applies to this paper.

In the ITER shielding design, the biological dose rates after shutdown in the region around the NBI ducts are critical. We have performed shielding calculations for the ITER/NBI ducts by 3-D Monte Carlo and 2-D SN codes with activation calculations. From comparison between calculated results by 3-D Monte Carlo and 2-D SN calculations, it has been found that the calculated results by the 2-D SN calculation overestimate by a factor of about eight at the cryostat in the case of the 91.5 cm high duct opening. From the 2-D SN calculation with activation calculations, we have deduced the conversion ratio relating fast neutron flux to the biological dose rates of~, 1.5-2.0 x 10• 5 µSv/hour/(cm• 2 sec.• 1). The biological dose rates are about 7 x 10 µSv/ hour in 50-60 cm thick duct wall from the fast neutron flux by the 3-D Monte Carlo calculation and the conversion ratio, and they can satisfy the design criteria.

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Thermodynamic analysis and heat transfer optimization of the CRAFT NNBI calorimeter

Tang,

Hu,

Xie

2023

Journal of Nuclear Science and Technology

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General Design of the Neutral Beam Injection System and Integration with ITER The disclaimer contained in ITER Publications Procedures S AC PP 1 93–10–12 W2 applies to this paper.

Cited by 3 publications

References 2 publications

Evaluation of biological dose rates around the ITER NBI ports by 2-D Sn/activation and 3-D Monte Carlo analyses

Evaluation of biological dose rates around the ITER NBI ports by 2-D Sn/activation and 3-D Monte Carlo analyses

Monte Carlo Analyses for ITER NBI Duct by 1/4 Tokamak Model

Thermodynamic analysis and heat transfer optimization of the CRAFT NNBI calorimeter

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