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論文

Study on the thermal-hydraulic of TEF-T LBE spallation target in JAEA

Wan, T.; 大林 寛生; 佐々 敏信

Proceedings of 17th International Topical Meeting on Nuclear Reactor Thermal Hydraulics (NURETH-17) (USB Flash Drive), 13 Pages, 2017/09

To realize the future Accelerator-driven systems (ADSs), an ADS Target Test Facility (TEF-T) will be constructed within the framework of Japan Proton Accelerator Research Complex (J-PARC) project to carry out basic R&Ds. A LBE spallation target will be installed in the TEF-T facility and be bombarded by high power pulsed proton beams (250 kW, 400 MeV, 25 Hz, 0.5 ms in pulse duration). The beam window (BW) of the spallation target is critical because it should survive under severe conditions, i.e., high temperature, high irradiation, intense stress and various occurred damage. Therefore, the target vessel should be carefully designed to obtain enough safety margin. Our previous research indicated that there are stagnant flow region in LBE at the BW tip due to the symmetric configuration of target, which causes high temperature and stress concentration on the BW. To reduce/move the stagnant flow region from BW tip and to increase the target safety margin, on the basis of our previous work, three types of upgraded target head designs were performed steadily in the present study. The thermal-hydraulic analyses and structural analyses for the target head designs have been carried out numerically under a steady-state condition. Results illustrated that the designs can almost eliminate the stagnant flow region in LBE. As a consequence, the thermal stress concentration on BW has been released and greatly decreased. The safety margin of target has been improved through this study.

論文

Numerical study on LBE flow behavior of the TEF-T LBE spallation target at JAEA

Wan, T.; 大林 寛生; 佐々 敏信

Proceedings of 11th International Topical Meeting on Nuclear Reactor Thermal Hydraulics, Operation and Safety (NUTHOS-11) (USB Flash Drive), 12 Pages, 2016/10

To solve basic technique issues for the accelerator-driven system (ADS), Atomic Energy Agency (JAEA) will construct the ADS Target Test Facility (TEF-T) within the framework of Japan Proton Accelerator Research Complex (J-PARC) project. A Lead-Bismuth Eutectic (LBE) spallation target with a Beam Window (BW) will be installed at TEF-T. LBE will be adopted as spallation material as well as coolant. For the TEF-T target, an annual channel was made between the outside LBE vessel and inner tube to flow the LBE. Computational Fluid Dynamics (CFD) analyses results showed that some stagnant regions exist at the center of BW and in the inner tube. Temperature in these regions are high and might deteriorate the soundness of target vessel. The purpose of this study is to optimize the LBE flow to decrease the temperature with the expectation that the safety margin of target can be improved in consequence. Efficient methods were developed to achieve this objective with minimizing the modification of target structure. Firstly, additional slits were made to flow LBE to reduce the stagnant region in the inner tube. Moreover, fin-type flow guides were added to reduce the stagnant region at the center of BW. As a result, the stagnant region in the inner tube was almost reduced and the stagnant region was moved away from the center of BW approximately 10 mm. Maximum temperature and thermal stress on the BW were consequently decreased.

論文

Measurement of LBE flow velocity profile by UDVP

菊地 賢司; 武田 靖*; 大林 寛生*; 手塚 正雄*; 佐藤 博

Journal of Nuclear Materials, 356(1-3), p.273 - 279, 2006/09

 被引用回数:8 パーセンタイル:52.29(Materials Science, Multidisciplinary)

核破砕ターゲットモデル反転流部の鉛ビスマス流を超音波で測定した。鉛ビスマス流の測定はこれまでに報告がなく、それは濡れ性が悪いことが原因であることが今回の実験で明らかになった。モデルループは同軸二重管の環状流が反転して管状流に移行するため、流れ場の遷移が非定常となる。鉛ビスマスの駆動は電磁ポンプ,流量測定は電磁流量計で行った。測定の結果、陽子ビームが当たる窓部では流れが淀み、熱伝達特性に影響を及ぼす局所流れの様子がわかった。

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