Abstract
Nuclear power plant operators conduct in-service testing (IST) to verify the safety functions of safety–related pumps and valves and to monitor the degree of vulnerability over time during reactor operation. The system to which the pump and valve to be tested are installed has various sizes of orificesfor flow control and decompression. Rapid flow acceleration and accompanying pressure drop may cause cavitation inside the orifice, which may result in orifice degradation and structural damage. Though licensing applications supported by using Computational Fluid Dynamics (CFD) software are gradually increasing for IST–related problems, there is no CFD software which obtains a licensing from the domestic regulatory body until now. In this paper, to assess the prediction performance of different commercialCFD software for the analysis of cavitating flow inside a square–edged orifice, the simulation was conducted with ANSYS CFX and FLUENT R18.1. The results predicted were then compared with the measured data.
Highlights
The system to which the in-service testing (IST)-related pump and valve to be tested are installed has various types and sizes of orifices for flow control and decompression
Though recently licensing applications supported by using Computational Fluid Dynamics (CFD) software are increasing for IST- related problems, there is no domestic regulatory guideline for the comprehensive evaluation of CFD software
From the nuclear regulatory perspective, it is necessary to perform the systematic assessment and prepare the domestic regulatory guideline for checking whether valid CFD software and the numerical modeling is used for IST-related problems [2]
Summary
The system to which the IST-related pump and valve to be tested are installed has various types and sizes of orifices for flow control and decompression. Though recently licensing applications supported by using CFD software are increasing for IST- related problems (including the orifice cavitation flow), there is no domestic regulatory guideline for the comprehensive evaluation of CFD software. From the nuclear regulatory perspective, it is necessary to perform the systematic assessment and prepare the domestic regulatory guideline for checking whether valid CFD software and the numerical modeling is used for IST-related problems [2]. To assess the prediction performance of different commercial CFD software for the analysis of cavitating flow inside a square-edged orifice, the simulation was conducted with ANSYS CFX and FLUENT R18.1
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