A new non-destructive inspection technique with using acoustic emission (AE) sensor was developed for the purpose of overcoming problems originating in existing hammering test. The new technique enables us to obtain inspection results with no dependence on personal skills of a checker, and to judge the integrity of the bolts based on quantitative measurement results. The investigation of applying the new method to mechanical anchor bolts is reported. From experimental results by using this technique, ...
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Development of non-destructive inspection technique for mechanical anchor bolts using AE sensor

１．緒言 原子力発電所では、多数の基礎ボルトや配管が用いられている。これらの基礎ボルトや配管などの鋼棒、鋼管は、周辺環境（設置場所や内部流体、機械振動など）により経年劣化（腐食、摩耗、き裂など）が発生する可能性が潜在している1-2。従って、機器・構造物の安全性・信頼性を確保する観点より、鋼棒、鋼管の経年劣化を検出する非破壊検査技術が望まれている。 このような鋼棒、鋼管の健全性を検査する手法として、一般的には、目視検査や打音検査、超音波検査が採用されている3-7。しかしながら、目視検査では、たとえば基礎ボル......
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Development of a new inspection system for steel rod and pipe using AE sensor (1) Experimental approach

A new inspection technique using AE (acoustic emission) sensor has been developed for the purpose of evaluating the integrity of steel rods and pipes, and sensitivity analyses were made for degradations of steel rods and pipes from a theoretical viewpoint. The Eigen frequency and modal frequency response analysis were conducted based on FEM (finite element method). Several peaks due to natural vibrations were observed in the frequency distribution calculated in this study, and comparisons with experi...
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Development of a new inspection system for steel rod and pipe using AE sensor (2) Theoretical approach

A new non-destructive inspection technique with using acoustic emission (AE) sensor for mechanical anchor bolt was developed for the purpose of overcoming problems originating in existing hammering test. The new technique enables us to obtain inspection results with little dependence on personal skills of a checker, and to judge the integrity of the bolts based on quantitative measurement results. The detectability to crack width on concrete was reported. From experimental results by using this techni...
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Development of non-destructive inspection technique for mechanical anchor bolts using AE sensor 2

A new inspection technique using AE (acoustic emission) sensor has been developed for the purpose of evaluating the integrity of steel rods and pipes, and sensitivity analyses were made for degradations of steel rods and pipes from a theoretical viewpoint. Inner surface corrosion model of the piping changing the corrosion contents were simulated frequency distribution by dynamic analysis using the finite element method, and comparisons with experimental results obtained from mockups with simulated degr...
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Development of a new inspection system for steel rod and pipe using AE sensor 2 (2) Theoretical approach

For evaluating the soundness of steel rods and pipes, which are installed in nuclear power plants, we have developed a new inspection system using an AE (acoustic emission) sensor. This report described the results of studies for the detection of defects in the steel pipe and steel rod using a new inspection system. ...
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Development of a new inspection system for steel rod and pipe using AE sensor 2 (1) Experimental approach

For the commercialization of fast breeder reactors (FBR), it is essential to enhance the economic competitiveness by reduction of total cost by elongation of plant service period. In this point of view, it is important to establish the assessment method of integrity of aged weld joint and repair welding for the components of future long life FBR. In the present study, evolution of microstructure is evaluated for the 304SS-304SS weld joint which was used for 88,000h at 526-545°C in the French proto-typ...
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Influence of FBR plant service and repair welding on microstructure and residual stress of austenitic stainless steel weld joint

Abstract: This study reports the development of a new microwave probe for the nondestructive testing of a pipe. Three-dimensional finite element simulations are carried out to optimize the profile of a microwave probe, whose results show that a probe with elliptic profile enables smaller reflection at the probes as well as much better single-mode propagation inside the pipe than conventional ones. Experimental validations are carried out using a straight brass pipe with an inner diameter of 39 mm and...
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Enhancement of microwave nondestructive testing method for the inspection of pipes by optimizing the microwave probe profile

For the commercialization of fast breeder reactors (FBR), it is essential to enhance the economic competitiveness by reduction of total cost by elongation of plant service period. For this reason, it is needed to establish the aged weld joint integrity assessment method for future FBR compon ents. Additionally, since it is expected to employ the repair weld for aged structural components, it is essential to investigate the effect of repair weld. To investigate the influence of high temperature-long service...
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Basic investigation of aging weld joint and repair weld joint integrity assessmentusing neutron residual stress measurement method

If leak trouble occurs at nuclear fuel reprocessing facility, repair welding procedure with short constructi on period is necessary to keep the safety of facility. As repair welding procedures, build-up welding proce dure and cover plate welding procedure have been developed. To get a good quality of repair welding joint wi thout lack of fusion and burn through into inside, heat box control is applied to these welding procedures....
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Development of welding repair procedures for nuclear fuel reprocessing facility