No abstract

This study is aim to evaluate the natural frequency variation of the scale-down reinforced concrete containment vessel specimen under accelerated corrosion conditions. A plastic ring was sealed around the perimeter of the cylindrical vessel bottom with the 3.5 % NaCl solution to achieve the accelerated corrosion test. Concrete resistivity, open circuit potential, corrosion rate and natural frequencies were tested and discussed in this study. Test results presented that the accelerated corrosion method with a direct 60 voltage applied was a suitable method for estimating and accelerating the concrete vessel specimen. Therefore, the changes in natural frequencies were consistent with the material degradation of the concrete vessel specimen. The natural frequencies decreased with the increasing corrosion rate or decreasing resistivities for the specimen at higher mode, but would be no change for the specimen at the natural frequency of 1stmode.

The scaled-down model of Reinforced Concrete Containment Vessel (RCCV) for Advanced Boiling Water Reactor (ABWR) building, whose weight is 30 tons, is the biggest seismic test in Taiwan, until now. The design and stress analysis of the testing model is following the ASME-359 code. This experimental test can be the basis to check whether the scaled-down RCCV is safe or not when it undergoes the fictitious seismic loading came from shaking table. The other object of this test is getting the experimental data of dynamic responses, such as accelerations and displacements, to verify the validity of numerical model.