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Report No.
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In-sodium calibration test of permanent magnet flow meter for JOYO core flow distribution measurement

Yamamoto, Kazuhiro; not registered; not registered; Kamide, Hideki; not registered; Maeda, Yukimoto*

Flow distribution in the core is planned to measure in the Experimental LMFBR, Joyo. Flow rate in a subassembly will be measured by permanent magnet type electromagnetic flow meter (EMF) which is set at the top of the subassembly by fuel handling machine. In-sodium calibration tests of the EMF were carried out in the Core Component Thermal Hydraulics Test Loop (CCTL). Tests were performed under such various conditions that sodium and permanent magnet temperature were 200, 225, 250, 275$$^{circ}$$C, and sodium flow rates ranged o to 640 l/min. Tests results are as follows: (1)Calibration curves were obtained at under each temperature condition. The eorrelations were linear and the maximum deviation between the calibration curve and the experimental data was within $$pm$$ 0.4%. (2)The sensitivity of the EMF output ($$varepsilon$$) at 250$$^{circ}$$C was 29.48 ($$mu$$V/[l/min]). The uncertainty was l.5% under the nominal flow rate condition (570 l/min). (3) $$varepsilon$$ depended on the sodium temperature (T) as follows: $$varepsilon$$ = 21.39+1.16$$times$$10$$^{-1}$$T-5.02$$times$$10$$^{-4}$$T$$^{2}$$+6.71$$times$$10$$^{-7}$$T$$^{3}$$ (4)Initial change of the $$varepsilon$$ after the sodium charge was examined, during few days. The $$varepsilon$$ was constant and stable. (5)There was no dependency of impurity concentration (plugging temperature) for the $$varepsilon$$. The calibration curves and temperature dependency are applied to the flow distribution measurement and the evaluation in the Joyo core.

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