研究目的
To test the mechanical property of PCCV during the integrated leakage rate testing (ILRT) and to monitor concrete strain using a fiber Bragg grating (FBG) sensor.
研究成果
FBG sensors and FEM simulation are very useful in PCCV structure monitoring. The monitoring results of each strain FBG had the same trend compared with pressure variation, proving the feasibility of FBG. The FEM model provided valuable information about the locations in which the strain sensors should be installed.
研究不足
The strain caused by concrete thermal expansion or contraction could not be eliminated by using temperature-compensating FBG. The FEM model was ideal, especially in that the concrete material property difference was not considered.
1：Experimental Design and Method Selection:
A fiber Bragg grating (FBG) sensor was used to monitor concrete strain during the integrated leakage rate testing (ILRT). A finite element method (FEM) model was built to simulate the progress of the ILRT.
2：Sample Selection and Data Sources:
The experiment was conducted on a prestressed concrete containment vessel (PCCV) at a nuclear power plant (NPP) in China.
3：List of Experimental Equipment and Materials:
FBG sensors (FBG-T-01 and SQ-FBG-GS01), Optical Sensing Interrogator sm125, No. 502 glue, epoxy resin.
4：Experimental Procedures and Operational Workflow:
FBGs were installed on the PCCV cylindrical wall, data was collected during the ILRT, and the FEM model was used to simulate the pressurization and depressurization process.
5：Data Analysis Methods:
The data were processed with temperature compensating and then exchanged to strain. The results were compared with the FEM model calculation results.
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