Chemistry: electrical and wave energy – Apparatus – Electrolytic
Patent
1995-05-08
1996-11-05
Tung, T.
Chemistry: electrical and wave energy
Apparatus
Electrolytic
204435, 205775, 2057945, G01N 2726
Patent
active
055713947
ABSTRACT:
An electrode probe for measuring the electrochemical potential of a surface at a location of interest in a boiling water reactor. The probe has a monolithic sensor configuration built into a single stainless steel mineral insulated (MI) cable. This monolithic sensor can be used as a switch to detect when the appropriate concentration of dissolved hydrogen required to provide IGSCC mitigation is present at any location inside the reactor. Using the sensor switch, it is possible to in situ instantly determine the minimum hydrogen level required to reach the IGSCC protection potential. The sensor configuration consists of a metal/metal oxide/ZrO.sub.2 sensor and a noble metal sensor in a combination wherein the outer sheath of a mineral insulated cable acts as the conductor for the noble metal and the central conductor of the MI cable acts as the conductor for the metal/metal oxide/ZrO.sub.2. The metal/metal oxide/ZrO.sub.2 sensor acts as a reference electrode in the BWR environment (i.e., at constant pH) and the noble metal sensor acts as a hydrogen electrode which responds to the dissolved hydrogen content in the BWR water.
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Hettiarachchi Samson
Indig Maurice E.
Law Robert J.
General Electric Company
McGinness James E.
Tung T.
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