Flow-induced vibration is an important issue related to the safety and reliability of nuclear reactor,which need to be analyzed and evaluated in the design stage. In order to obtain the input load and key parameters used in the calculation of flow-induced vibration of reactor internals that need to be satisfied the engineering requirements. The typical reactor internals are selected as the research object, and the fluid exciting force characteristics are studied based on the computational fluid dynamics methods. The results show that the fluid exciting force acting on the reactor internalsis a wide-band stochastic process. This characteristic is consistent with the nature of broadband randomness. For upper internal, the largest pressure fluctuation occurs at the guide tubes and support columns located near the outlet. Therefore, it is necessary to be paidmore attention to these guide tubesand support columns in response analysis.As for core barrel, the root mean square value of the pressure fluctuation changes drastically at the inlet and outlet location, meanwhile,the pressure fluctuation value is also considerably large.For lower internal, the lower flow field of reactor internals is relatively disordered,and its pressure fluctuation possesses irregular characteristics. Thus,each component of lower internal need to be considered in analysis and evaluation.

Research on Characteristics of Fluid Exciting Force of Reactor Internals

Paper Proceedings: https://asmedigitalcollection.asme.org/PVP/PVP2021/volume/85314

ASME 2021 Pressure Vessels & Piping Conference (PVP2021)

Supporting the need among researchers worldwide for additional online and multimedia content, ASME now offers the ASME Conference Video Collection. This platform will collect and provide long-term access to conference presentation videos, encompassing all technology areas within ASME's technical conference and events program. About 30,000-40,000 engineers across all mechanical engineering and related disciplines participate in ASME conferences each year. This includes authors of approximately 6,000 to 8,000 technical papers published by ASME, the majority of whom also submit video presentations for our virtual conferences. The video collection will be available as an add-on to existing product packages or as a separate subscription.