Development of side wall type permanent magnet flowmeter for sodium flow measurement in large pipes of SFRs |
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| Affiliation: | 1. Department of Mechanical Power Engineering, Cairo University, Giza, Egypt;2. Reactors Department, Atomic Energy Authority, Cairo, Egypt;1. Department of Mining and Nuclear Engineering, Missouri University of Science and Technology, Fulton Hall, 310 W. 14th Street, Rolla, MO 65409, USA;2. Department of Chemical and Biochemical Engineering, Missouri University of Science and Technology, 110 Bertelsmeyer Hall, 1101 N. State Street, Rolla, MO 65409, USA;3. Leading Edge Non Destructive Testing Technology (LENDT) Group, Industrial Technology Division, Malaysian Nuclear Agency, Bangi, 43000, Kajang, Selangor D.E., Malaysia;1. Eletrobrás Termonuclear S.A. – Eletronuclear, Departamento GEI.T, Rua da Candelária, 65, CEP 20091-906, Rio de Janeiro, RJ, Brazil;2. Departamento de Engenharia Nuclear, Escola de Engenharia – UFMG, Av. Antônio Carlos, 6627-Pampulha, Belo Horizonte, MG, CEP 31270-901, Brazil;1. School of Nuclear Science & Engineering, North China Electric Power University, Beijing 102206, China;2. Nuclear Power Institute of China, Cheng Du, Sichuan 610200, China |
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| Abstract: | Sodium cooled Fast Reactors (SFR) require measurement of liquid sodium flow in its primary and secondary circuits. For the primary system of the pool type concept of SFR design, flowmeters have to be immersed in sodium pool and require flow sensors which can withstand high temperatures up to 550 °C, nuclear radiation and chemically reactive sodium environment. Secondary circuits and safety grade decay heat removal (SGDHR) circuits of SFR need flow measurement in stainless steel (SS) pipes of diameter varying from 15 mm to 800 mm. For small pipes, flowmeters with permanent magnet flowmeter with ALNICO-V magnet assembly is the unanimous choice. Conventional permanent magnet flowmeters (PMFM) for large pipelines become bulky, heavy and have installation problems. For sodium flow measurement in large pipelines a few other alternate methods are considered. In the case of Prototype Fast Breeder Reactor (PFBR), which is at an advanced stage of construction at Kalpakkam, flow in the 800 mm diameter secondary main circuit is measured by means of a bypass flowmeter. Other sensors that could be deployed include eddy current flowmeters (ECFM), which are introduced into the pipe to measure flow velocity in the pipe, ultrasonic flowmeters and permanent magnet based side wall flowmeters. In permanent magnet based side wall flowmeter (SWFM), a permanent magnet block is mounted on one side of the large pipe and the magnetic field produced by the magnet penetrates through the pipe and interacts with the flowing sodium and induces an electro motive force (emf) proportional to the flow. This is a compact, cost effective and fairly accurate method for flow measurement in large pipelines of SFR circuits. SWFM is suitable for pipelines of 100 mm and above. In the present work a side wall flowmeter for 100 mm pipe is designed, manufactured, calibrated and tested in an existing sodium facility. Voltage signal developed in SWFM for different flowrates was simulated with three dimensional Finite Element Model (FEM) and validated with experimental results. Effect of asymmetric magnetic field on flowmeter voltage signal and dependence of flowmeter voltage signal on position of electrodes was also analyzed with model. The feasibility of use of this type of flowmeter for large pipelines of SFRs is demonstrated. |
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| Keywords: | Electromagnetic flowmeter Sensitivity estimation FEM analysis |
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