• Title/Summary/Keyword: Energy measurement

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

  • Hong, Jong-Sook;Cha, Hong-Ryul;Park, Hyoung-Nae;Lee, Byung-Doo;Park, Ho-Joon
    • Nuclear Engineering and Technology
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    • v.23 no.2
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    • pp.233-240
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    • 1991

  • U-235 enrichment has been measured non-destructively by passive gamma-ray pulse height analysis. Measurement source is 185.7 keV gamma-ray which is emitted from uranium sample during alpha decay of U-235 in it. Factors influencing the measurement such as sample composition, attenuation effect of container wall, collimation effect and counting efficiency were evaluated. Under the optimized counting system, the measured relative errors were~8%, ~8% and~1% from Tag values at 95% confidence level for depleted UF$_{6}$ cylinders, depleted UO$_2$powder, and natural UO$_2$powder respectively.

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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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    • v.50 no.3
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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