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C.D.R. Azevedo,A. Baeza,E. Chauveau,J.A. Corbacho,J. Diaz,J. Domange,C. Marquet,M. Martinez-Roig,F. Piquemal,C. Roldan,J. Vasco,J.F.C.A. Veloso,N. Yahlali Korean Nuclear Society 2023 Nuclear Engineering and Technology Vol.55 No.7
In the TRITIUM project, an on-site monitoring system is being developed to measure tritium (<sup>3</sup>H) levels in water near nuclear power plants. The quite low-energy betas emitted by <sup>3</sup>H have a very short average path in water (5 ㎛ as shown by simulations for 18 keV electrons). This path would be further reduced by impurities present in the water, resulting in a significant reduction of the detection efficiency. Therefore, one of the essential requirements of the project is the elimination of these impurities through a filtration process and the removal of salts in solution. This paper describes a water treatment system developed for the project that meets the following requirements: the water produced should be of near-pure water quality according to ISO 3696 grade 3 standard (conductivity < 10 µS/cm); the system should operate autonomously and be remotely monitored.
Variables affecting strain sensing function in cementitious composites with carbon fibers
F.J. Baeza,E. Zornoza,L.G. Andión,S. Ivorra,P. Garcés 사단법인 한국계산역학회 2011 Computers and Concrete, An International Journal Vol.8 No.2
In this work, cement paste samples with 1% (by cement mass) of a conductive carbon fiber admixture have been studied under uniaxial compression. Three different arrangements were used to measure the resistivity of the samples. According to the results obtained, the resistance should be measured using the four wire method in order to obtain good sensitivity and repeatability. The effect of the load value and the load rate on the fractional change of the volume resistivity has been determined. It has been observed that the gage factor (fractional change in resistance respect to strain) increases when the maximum load is increased, and the loading rate does not affect significantly this parameter. The effect of the sample ambient humidity on the material piezoresistivity has also been studied, showing that the response of the composite is highly affected by this parameter.