Level monitoring system with pulsating sensor-Application to online level monitoring of dashpots in a fast breeder reactor

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Author list: Malathi N, Sahoo P, Ananthanarayanan R, Murali N

Publisher: AIP Publishing

Place: MELVILLE

Publication year: 2015

Journal acronym: REV SCI INSTRUM

Volume number: 86

Issue number: 2

Number of pages: 8

ISSN: 0034-6748

Languages: English-Great Britain (EN-GB)

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Abstract

An innovative continuous type liquid level monitoring system constructed by using a new class of sensor, viz., pulsating sensor, is presented. This device is of industrial grade and it is exclusively used for level monitoring of any non conducting liquid. This instrument of unique design is suitable for high resolution online monitoring of oil level in dashpots of a sodium-cooled fast breeder reactor. The sensing probe is of capacitance type robust probe consisting of a number of rectangular mirror polished stainless steel (SS-304) plates separated with uniform gaps. The performance of this novel instrument has been thoroughly investigated. The precision, sensitivity, response time, and the lowest detection limit in measurement using this device are <0.01 mm, similar to 100 Hz/mm, similar to 1 s, and similar to 0.03 mm, respectively. The influence of temperature on liquid level is studied and the temperature compensation is provided in the instrument. The instrument qualified all recommended tests, such as environmental, electromagnetic interference and electromagnetic compatibility, and seismic tests prior to its deployment in nuclear reactor. With the evolution of this level measurement approach, it is possible to provide dashpot oil level sensors in fast breeder reactor for the first time for continuous measurement of oil level in dashpots of Control & Safety Rod Drive Mechanism during reactor operation. (C) 2015 AIP Publishing LLC.

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