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Kurata, Yuji; Abe, Yuji*; Futakawa, Masatoshi; Oigawa, Hiroyuki
Journal of Nuclear Materials, 398(1-3), p.165 - 171, 2010/03
Times Cited Count：15 Percentile：70.23(Materials Science, Multidisciplinary)Liquid lead-bismuth is a candidate material used for accelerator driven systems and fast reactors. Oxygen control in liquid lead-bismuth is essential in this system and oxygen sensors are the critical instruments for the active oxygen control system. In this study, a re-activation treatment was investigated as well as characterization of oxygen sensors for use in liquid lead-bismuth. The oxygen sensor with a solid electrolyte of yttria-stabilized zirconia (YSZ) and a Pt/gas reference electrode showed almost the same electromotive force values as the theoretical ones at temperatures above 400 or 450 
C. After use for longer times than 6000 h, the outputs of the sensor became incorrect in liquid lead-bismuth. The state of the sensor showing incorrect outputs was not recovered by cleaning with nitric acid. However, it was found that the oxygen sensor was able to become a correct sensor indicating theoretical values after a re-activation treatment of the surface of the YSZ.
Kikuchi, Kenji; Tezuka, Masao*; Saito, Shigeru; Onizawa, Tatsuya*; Abe, Yuji*; Miura, Kuniaki*
no journal, ,
Solid-electrolyte oxygen-probe was developed for measurement of oxygen concentration in lead bismuth eutectic. The difference of the probe from conventional ones is that first reference electrolyte is iron oxide, secondly it is a cassette type model that can be a part of circulating pipe, and thirdly measuring temperature is below 400 C. Proto type probe was attached in the circulating PbBi loop of JAEA and measurement rest was done during about 8000 hrs. Oxygen concentration of the loop, with non-active oxygen control but PbBi was shielded from the air by high purity argon gas, was evaluated to be 1E-5 to 1E-2 wppm.
Kurata, Yuji; Abe, Yuji*; Futakawa, Masatoshi; Oigawa, Hiroyuki
no journal, ,
Liquid lead-bismuth is a candidate material used for accelerator driven systems and fast reactors. Oxygen control in liquid lead-bismuth is essential in this system and oxygen sensors are the critical instruments for the active oxygen control system. In this study a regeneration treatment was investigated for the oxygen sensor which had become showed incorrect electromotive force between liquid lead-bismuth and a reference electrode due to some degradation. The Pt/air probe based on yttria-stabilized zirconia solid electrolyte was tested. It was shown that the oxygen sensor with incorrect outputs was be able to become a correct sensor indicating theoretical values above about 400C after a regeneration treatment.
