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Establishment of the design requirements for a flow blockage detection system through a LES analysis of the temperature fluctuation in the upper plenum
When an assembly in a core is partially blocked, the temperature in the upper plenum fluctuates at an early stage. Therefore, the temperature fluctuation in the upper plenum can provide the information about a local blockage of an assembly. For developing the detection algorithm for the partial bloc...
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Published in: | Annals of nuclear energy 2006, Vol.33 (1), p.62-70 |
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Main Authors: | , , , |
Format: | Article |
Language: | English |
Citations: | Items that this one cites Items that cite this one |
Online Access: | Get full text |
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Summary: | When an assembly in a core is partially blocked, the temperature in the upper plenum fluctuates at an early stage. Therefore, the temperature fluctuation in the upper plenum can provide the information about a local blockage of an assembly. For developing the detection algorithm for the partial blockage, we analyzed the temperature fluctuation in the upper plenum due to the partial blockage in an assembly. The LES turbulence model in the CFX code was used for analyzing the temperature fluctuation in the upper plenum because the LES is suitable for analyzing the time dependent turbulence variables. After analyzing the temperature fluctuations in the upper plenum, we established basic design requirements for the flow blockage detection system through a FFT analysis and some statistical analysis. We concluded that response time of a measuring device was less than 13
m
s and that it should cover a high temperature range of 1000
K. In addition, the resolution of the thermocouple was less than 2
K and its location should be within 25
cm from the exit of each assembly. |
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ISSN: | 0306-4549 1873-2100 |
DOI: | 10.1016/j.anucene.2005.03.013 |