In the nuclear power plant under the severe accident, it is possible that the debris dust and the metallic powder are immixed in the coolant, and then the flow pattern can become the solid-liquid multiphase flow in the reactor coolant circulation system. In this study, the numerical analysis is conducted in order to evaluate the FAC profile in the piping under the solid-liquid multiphase flow. By using the FAC model, the mass transfer coefficient in the elbow was evaluated. The mass transfer coefficient bec...
英字タイトル:
Piping System, Risk Management based on Wall Thinning Monitoring and Prediction (3) Evaluation of Wall Thinning Profile by Flow Accelerated Corrosion under Solid-Liquid Multiphase Flow

Domestic light water reactors are expected to restart sequentially after given permission in condition to meet the new regulatory requirements. Since several safety related systems were added to the plants through the process of the new regulatory requirements, the numbers of components to be inspected, which is already a large amount, will increase even more after the restart. Effective measure will be required to command maintenance activities by reasonably assigning limited resource. The authors hav...
英字タイトル:
Study on Fluid Leakage Behavior with Pipe Failure

Flow accelerated corrosion (FAC) is the major pipe wall thinning phenomena in power plants. The management of pipe wall thinning has been carried out to pipe elements such as elbow, orifice, etc. of the piping system in power plants. In piping system, it is known that several pipe elements which are connected in series may generate swirl flow. Therefore the arrangement of pipe elements is considered to affect thinning phenomena seriously. So the behavior of this swirl flow is one of the major research ...
英字タイトル:
EFFECT OF SWIRL FLOW GENERATED BY THE COMBINATION OF PIPE ELEMENTS ON WALL THINNING PHENOMENA