• 제목/요약/키워드: Energy measurement

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수동적 감마선분석에 의한 핵물질 농축도 측정 (Enrichment Measurement of Nuclear Materials by Passive Gamma-ray Analysis)

  • Hong, Jong-Sook;Cha, Hong-Ryul;Park, Hyoung-Nae;Lee, Byung-Doo;Park, Ho-Joon
    • Nuclear Engineering and Technology
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    • 제23권2호
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    • pp.233-240
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    • 1991

  • 수동적 감마선분석에 의해 U-235의 농축도를 비파괴적으로 측정하였다. 측정차상이 되는 선원은 U-235의 알파붕괴시 방출되는 185.7 keV 감마선이다. 농축도 측정에 영향을 미치는 인자, 즉 시료구성, 시료용기의 두께변화에 따른 감쇠효과, 감마선의 집속 및 검출효율 등을 평가하였다. 최적계측시스템하에서 측정된 상대오차는 95%신뢰구간에서 Tag값과 비교했을 때 감손 UF$_{6}$ 실린더에 대해서는 ~8%, 감손 및 천연 $UO_2$분말에 대해서는 ~8%, ~1%로 각각 나타났다.

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Particle image velocimetry measurement of complex flow structures in the diffuser and spherical casing of a reactor coolant pump

  • Zhang, Yongchao;Yang, Minguan;Ni, Dan;Zhang, Ning;Gao, Bo
    • Nuclear Engineering and Technology
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    • 제50권3호
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    • pp.368-378
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    • 2018

  • Understanding of turbulent flow in the reactor coolant pump (RCP) is a premise of the optimal design of the RCP. Flow structures in the RCP, in view of the specially devised spherical casing, are more complicated than those associated with conventional pumps. Hitherto, knowledge of the flow characteristics of the RCP has been far from sufficient. Research into the nonintrusive measurement of the internal flow of the RCP has rarely been reported. In the present study, flow measurement using particle image velocimetry is implemented to reveal flow features of the RCP model. Velocity and vorticity distributions in the diffuser and spherical casing are obtained. The results illuminate the complexity of the flows in the RCP. Near the lower end of the discharge nozzle, three-dimensional swirling flows and flow separation are evident. In the diffuser, the imparity of the velocity profile with respect to different axial cross sections is verified, and the velocity increases gradually from the shroud to the hub. In the casing, velocity distribution is nonuniform over the circumferential direction. Vortices shed consistently from the diffuser blade trailing edge. The experimental results lend sound support for the optimal design of the RCP and provide validation of relevant numerical algorithms.

  • https://doi.org/10.1016/j.net.2017.12.012 인용 PDF KSCI