Radiation streaming analysis through narrow gaps in Fusion Experimental Reactor. (FER)
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Many void gaps originated from assembly/disassembly concept of reactor structures exist in a tokamak reactor. Radiation streaming through these gaps causes hot spots in terms of irradiation of in-vessel components and of biological dose rate in personnel access area. For two-dimensional analysis of streaming through such a narrow gap, the discrete ordinates (S<SUB>N</SUB>) method suffers from ray effects. In this paper, therefore, necessary conditions for angular quadrature were first investigated by comparing the S<SUB>N</SUB> results with the line-of-sight results and the Monte Carlo results. As a result, it was found that the biased 166 angular quadrature (131 forward angles) gave results with practically sufficient accuracy for shielding design with some correction for the ray-effect. Also, local peaking factors due to the gap streaming were obtained as a function of gap width and shield thickness, and they are useful for future shielding design. Based on these preliminary investigations, the design calculation for the FER shield configuration was performed. It was made clear that the design criteria for superconducting magnet were satisfied even if the gap streaming effect was taken into account. Further, some measures to reduce the local peaking of dose rate in the personnel access area were proposed.
- 一般社団法人 日本原子力学会の論文
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