Underwater ACFM Weld Defect Detection System for Spent Fuel Pool in Nuclear Power Plant
The work aims to develop an underwater defect detection system based on alternating current electromagnetic field detection(ACFM)technology for the underwater detection of weld defects on the steel cladding of spent fuel pools in nu-clear power plants,to detect and identify tiny leaks in the weld,so as to ensure the structural integrity and safe operation of spent fuel pools.Finite element simulation and experimental verification were combined.Firstly,the main material S32101 duplex stainless steel of the third generation nuclear power spent fuel pool steel cladding was used as the research object.A defect de-tection model of ACFM was established by COMSOL Multiphysics,and the excitation frequency and excitation current were optimized and analyzed.Subsequently,an ACFM defect detection equipment suitable for nuclear power plant underwater envi-ronment was developed,and the reliability of the equipment was verified by water pressure,electromagnetic interference and ir-radiation tests.The results showed that the best detection effect could be obtained when the excitation rate was set between 1 kHz and 5 kHz and the excitation current was large.The experimental results showed that the system had good applicability in the irradiated underwater environment,and could effectively detect and identify the micro-hole penetration defects with a di-ameter of 0.1 mm and the superficial defects of 3 mmx0.2 mmx0.5 mm.Based on the results of comprehensive simulation analysis,equipment development and experimental verification,the developed underwater ACFM defect detection system can meet the underwater detection requirements of steel cladding weld defects in spent fuel pool of nuclear power plant,and provide effective technical means for early warning and leakage point determination of underwater defects in nuclear facilities.
spent fuel poolS32101underwater defect detectionalternating current field measurementtest
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维普
