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Gamma and dose fields around the primary circuit of a helium-cooled fusion power plant

C.B.A. Forty1997年Fusion Engineering and DesignIF 1.7出版社

AbstractThe Monte Carlo code MCNP-4 has been used to determine the photon flux spectra around two important regions of the primary circuit of the conceptual SEAFP Plant Model 1 (PM-1) fusion power plant. These fluxes have been converted to absorbed dose rates in human tissue by using dose rate conversion factors. Dose rates around a ‘hot-leg’ pipe were found to be low and not significantly above naturally occurring background levels. The dose field surrounding a steam generator were found to be higher than the ‘hot-leg’ pipe, but still well within acceptable limits. Dose rates inside the steam generator shell are considerably higher and would probably require remote and robotic method for inspection and maintenance tasks. The annual occupational radiation exposure to all plant workers was estimated to be approximately 170 man-mSv year−1, which is similar to the levels experienced with modern PWRs, after decades of optimisation.

日本語訳

モンテカルロコードMCNP-4を用いて、概念設計上のSEAFPプラントモデル1(PM-1)核融合発電プラントの一次系の2つの重要な領域周辺における光子フルエンススペクトルを決定した。これらのフルエンスは、線量換算係数を用いて人体組織中の吸収線量率に換算された。『ホットレグ』配管周辺の線量率は低く、自然放射線バックグラウンドレベルを有意に上回るものではないことが判明した。蒸気発生器周辺の線量場は『ホットレグ』配管よりも高いものの、依然として許容範囲内であることが判明した。蒸気発生器シェル内部の線量率はかなり高く、点検および保守作業にはおそらく遠隔操作によるロボット手法が必要となるであろう。全プラント作業員の年間被ばく線量は約170人・mSv/年と推定され、これは数十年にわたる最適化を経た現代のPWRで経験されるレベルと同程度である。

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