[KSCI] Korea Science Citation Index Service

http://dx.doi.org/10.1016/j.net.2021.03.025

Signal processing method of bubble detection in sodium flow based on inverse Fourier transform to calculate energy ratio

Xu, Wei (School of Electrical and Automation Engineering, Hefei University of Technology)
Xu, Ke-Jun (School of Electrical and Automation Engineering, Hefei University of Technology)
Yu, Xin-Long (School of Electrical and Automation Engineering, Hefei University of Technology)
Huang, Ya (School of Electrical and Automation Engineering, Hefei University of Technology)
Wu, Wen-Kai (School of Electrical and Automation Engineering, Hefei University of Technology)

Publication Information

Nuclear Engineering and Technology / v.53, no.9, 2021 , pp. 3122-3125 More about this Journal

Abstract

Electromagnetic vortex flowmeter is a new type of instrument for detecting leakage of steam generator, and the signal processing method based on the envelope to calculate energy ratio can effectively detect bubbles in sodium flow. The signal processing method is not affected by changes in the amplitude of the sensor output signal, which is caused by changes in magnetic field strength and other factors. However, the detection sensitivity of the electromagnetic vortex flowmeter is reduced. To this end, a signal processing method based on inverse Fourier transform to calculate energy ratio is proposed. According to the difference between the frequency band of the bubble noise signal and the flow signal, only the amplitude in the frequency band of the flow signal is retained in the frequency domain, and then the flow signal is obtained by the inverse Fourier transform method, thereby calculating the energy ratio. Using this method to process the experimental data, the results show that it can detect 0.1 g/s leak rate of water in the steam generator, and its performance is significantly better than that of the signal processing method based on the envelope to calculate energy ratio.

Keywords

Sodium-cooled fast reactor; Steam generator; Leak detection; Electromagnetic vortex flowmeter; Signal processing method;

Citations & Related Records

Reference

1	V. Sumathi, S. Jalaldeen, P. Selvaraj, S. Murugan, Vibration of core subassemblies due to large sodiumewater reaction in the steam generator of a Liquid Metal Fast Breeder Reactor, Prog. Nucl. Energy 106 (2018) 231-239. https://10.1016/j.pnucene.2018.03.005. DOI
2	R. Hans, K. Dumm, Leak detection of steam or water into sodium in steam generators of liquid-metal fast breeder reactors, Atom. Energy Rev. 15 (4) (1977) 611-699, https://doi.org/10.1016/0378-4487(77)80006-X. DOI
3	W. Xu, K.J. Xu, J.P. Wu, et al., Signal processing method based on energy ratio for detecting leakage of SG using EVFM, Nuclear Eng Technol (2020). https://10.1016/j.net.2020.01.023. DOI
4	J.Y. Jeong, T.J. Kim, J.M. Kim, B.H. Kim, N.C. Park, Analysis of micro-leak sodiumwater reaction phenomena in a sodium-cooled fast reactor steam generator, Kor. J. Chem. Eng. 26 (4) (2009) 1004-1008, https://doi.org/10.1007/s11814-009-0167-x. DOI
5	S. Kishore, A.A. Kumar, S. Chandramouli, B.K. Nashine, K.K. Rajan, P. Kalyanasundaram, S.C. Chetal, An experimental study on impingement wastage of Mod 9Cr 1Mo steel due to sodium water reaction, Nucl. Eng. Des. 243 (2012) 49-55. https://10.1016/j.nucengdes.2011.11.008. DOI
6	B. Raj, S.L. Mannan, P.R.V. Rao, M.D. Mathew, Development of fuels and structural materials for fast breeder reactors, Sadhana 27 (5) (2002) 527-558, https://doi.org/10.1007/bf02703293. DOI
7	D.J. Hayes, Water leaks in sodium-heated fast reactor boilers, Phys. Technol. 9 (3) (1978) 96, https://doi.org/10.1088/0305-4624/9/3/I04. DOI