Tsutomu Shioyama

Evaluation of Dynamic Loads due to Steam Condensation in Boiling Water Reactor ABWR Containment

The purpose of this study is to identify hydrodynamic loads due to steam condensation acting on the Suppression Pool (S/P) in Primary Containment Vessel (PCV) of Advanced-Boiling Water Reactor (ABWR) by using general-purpose analysis code, ANSYS™. The source load methodology has been used to evaluate the hydrodynamic loads, which are classified into condensation oscillation (CO) and chugging (CH). When setting the design source from the confirmation test, the calculation method due to the eigenfunction of the cylindrical coordinate system was used. Since, there were various limitations in the previous approaches, a new analysis approach has been expected. In this study, the pool of ABWR horizontal-vent confirmatory test facility is modeled with the ANSYS™ acoustic elements. The calculation results are in good agreement with the test pressure oscillations. It is confirmed that the proposed approach can create the design source enveloping the PSD of test results.Copyright

A Study on Active Noise Control for Minimizing Total Acoustic Power : Acoustic Power Minimization on Zero Control Power Output(Mechanical Systems)

This paper concerns the minimization of total acoustic power radiated from noise source. First, the authors focus that the acoustic power of the control source under the optimal condition for minimizing total acoustic power become zero. Then, the authors propose a method employing an active noise control in order to minimize the total acoustic power by investigating the acoustic intensity distribution pattern of the control source. This power reducing performance is verified on the basis of theoretical estimations.