The JSME Committee on Power Generation Facility Codes is developing a fatigue evaluation method by flaw tolerance. The ASME B& PV Code Section XI has Non-mandatory Appendix L, which provides a flaw tolerance method for fatigue evaluation when a cumulati ve usage factor (CUF) of a component is greater than 1.0. In order to develop a flaw tolerance method for the JSME Codes, post ulated initial flaws, capability of nondestructive examination, compatibility to rules and flaw tolerance codes are discussed....
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Development of Fatigue Evaluation Using Flaw Tolerance Method

The ultrasonic examination personnel are required to have high-level abilities such as defect detection, classification of detected echoes and so on, in the ISI of nuclear power plant in Japan. For that purpose, the examination personnel of the inspection companies are trained to learn and maintain these abilities. In general, the importance of education and training for the ultrasonic examiners is recognized. However, the effectiveness of education and training to enhance the abilities of the ultraso...
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Study on effectiveness of education and training for ultrasonic examiner in austenitic stainless steel piping welds

Recently, it is reported that the primary water stress corrosion cracking (PWSCC) has been occurred at the nickel based alloy weld components such as steam generator safe end weld, reactor vessel safe end weld, and so on, in PWR. Defect detection and sizing is important in order to ensure the reliable operation and life extension of nuclear power plants. In the reactor vessel safe end weld, it was impossible to measure crack depth of PWSCC. The crack has occurred in the axial direction of the safe end wel...
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Application of Phased Array UT Technique for Crack Depth Sizing on Nickel Based Alloy Weld

Recently, it is reported that the primary water stress corrosion cracking (PWSCC) has been occurred at the nickel based alloy weld components such as steam generator safe end weld, reactor vessel safe end weld, and so on, in PWR. Defect detection and sizing is important in order to ensure the reli able operation and life extension of nuclear power plants. In the reactor vessel safe end weld, it was impossible to measure crack depth of PWSCC. The crack was detected in the axial direction of the safe end wel...
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Development of Phased Array UT procedure for Crack Depth Sizingon Nickel Based Alloy Weld

Recently, it is reported that the primary water stress corrosion cracking (PWSCC) has been occurred at the nickel based alloy weld components such as stea m generator safe end weld, reactor vessel safe end weld, and so on, in PWR. Defect detection and sizing is important in order to ensure the reliable operat ion and life extension of nuclear power plants. In the reactor vessel safe end weld, it was impossible to measure crack depth of PWSCC. The crack was dete cted in the axial direction of the safe end w...
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Investigation of Phased Array UT procedure for Crack Depth Sizing on Nickel Based Alloy Weld

The improvement of defect detection and sizing capabilities for nondestructive inspection technique has been required in order to ensure the reliable operation and life extension of nuclear power plant . Immersion phased array UT technique which is not affected the surface geometry of welds has been developed for inspection of BWR internals such as shroud, shroud support, and so on. Furthermore, thin -type array probe was developed and was examined in UT of core spray piping welds in the narrow region betw...
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Application of Phased Array UT on BWR Reactor Internals Piping

The improvement of defect detection and sizing capabilities for nondestructive inspection technique has been required in order to ensure the reliable operation an d life extension of nuclear power plant. Phased array UT technique has superior capabilities for beam steering and focusing to objective regions, and real time B- scan imaging without mechanical scanning. Water gap phased array UT is capable to apply to inspection of welds of BWR internals such as shroud, shroud support, an d so on. Outline of TO...
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Application of Phased Array UT in BWR Internals

The request of the inspection to reactor internals is increasing with application of the Japanese operation and maintenance code to aged nuclear power plants. Toshiba has developed many outstanding under water inspection t echnologies combined with ultrasonic testing (UT) techniques and remote operated vehicles (ROVs) technologies. Water gap phased array UT technique is capable to apply to all internals including complicated form part such a s reactor bottom head penetration weldment. Laser-ultrasonic te...
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Inspection Technologies for Reactor Internals of Aged Nuclear Power Plants

In recent years, it has been reported that the primary water stress corrosion cracking (PWSCC) has occurred in dissimilar metal weld (DMW) components such as steam generator nozzle to safe end weld, reactor vessel nozzle to safe end weld, and so on, in PWR. The depth sizing of such cracks with high accuracy is important in order to ensure the reliable operation and life extension of nuclear power plants. Therefore, construction of the performance demonstration (PD) system for certifying DMW inspection ...
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Investigation of Equivalency of Ultrasonic Response Relation between SCC and Non-SCC Crack in Dissimilar Metal Weld

In recent years, it has been reported that the primary water stress corrosion cracking (PWSCC) has occurred in dissimilar metal weld (DMW) components such as steam generator safe end weld, reactor vessel safe end weld, and so on, in PWR. The depth sizing of such cracks with high accuracy is important in order to ensure the reliable operation and life extension of nuclear power plants. Therefore, construction of the performance demonstration (PD) system for certifying DMW inspection method is being inve...
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Investigation of Phased Array UT technique for Circumferential Crack Depth Sizing in Dissimilar Metal Weld