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Occasional Topics
OT7 (2010-1-8)
 
The Latest MHI Inspection Technology
for PWR Nuclear Power Plants in Japan
 
Nuclear Service Quality Control Section
Quality Assurance Department
KOBE Shipyard & Machinery Works
MITSUBISHI HEAVY INDUSTRIES, LTD
 
KEYWORDS:
PWR, RV, Piping, Alloy600, SG Tubing, A-UT, Phased Array, UT Sizing, Intelligent ECT Probe
 

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  1.The Latest MHI Inspection Technology for PWR Nuclear Power Plants in Japan

Nuclear Service Quality Control Section
Quality Assurance Department
KOBE Shipyard & Machinery Works
MITSUBISHI HEAVY INDUSTRIES, LTD
JAPAN

  2. RV Inspection Technology [ Topics ]
 

-RV Inspection Technology
-Piping Inspection Technology
-Inconel Alloy Inspection Technology
-SG Tubing Inspection Technology

  3. RV Inspection Technology [ Contents ]
 

-Advanced UT II System Overview
-Function of A-UT II System
-Advantage of A-UT II System
-Example of UT data
-Field Experience

  4. RV Inspection Technology [ Advanced UT II System Overview ]
  5. RV Inspection Technology [ Function of A-UT II System ]
 

1. A-UT machine can move to inspection area by driving force with the thruster.
2. A-UT machine can be fixed on a wall of RV by the suction cups.
3. UT sensors ( Conventional and Phased array sensor ) can be installed in A-UT machine and data from each UT sensors can be acquired at the same time.

  6. RV Inspection Technology [ Advantage of A-UT II System ]

1. Possible to shorten the required time for inspection by using two(2) machines simultaneously
2. Two(2) machines are compatible with each other in performing inspection for all welding sections
3. Small and light-weight design
4. Easy and space-saving to assemble, disassemble, and clean up the machine.
5. Polar crane is not needed during inspection
6. Originally developed smooth scanning with seven(7) axis manipulators

  7. RV Inspection Technology [ Example of UT data ]
  8. RV Inspection Technology [ Field Experience of A-UT System ]
  9. Piping Inspection Technology [ Contents ]
 

-Automatic UT Data Acquisition System
-UT Data Analysis System
-Field Experience
-MHI Point Focus Phased Array UT

10. Piping Inspection Technology [ Automatic UT Data Acquisition System ]
  Automatic UT Acquisition system makes it possible to record all digital UT data and locations automatically.
11. Piping Inspection Technology [ UT Data Analysis System ]

12. Piping Inspection Technology [ UT Data Analysis System ]

Function and Advantage
1. Automatic Extraction Function
2. 3-Dimensional Display Function
3. Advanced Filtering Function

13. Piping Inspection Technology [ UT Data Analysis System ]

Automatic Extraction Function
Automatic Extraction Function makes it possible to extract and record signals ( location, level and length ) greater than the threshold automatically.

14. Piping Inspection Technology [ UT Data Analysis System ]

3-Dimensional Display Function
3-Dimensional Display Function makes it possible to locate the position of the reflection source easily and precisely.

15. Piping Inspection Technology [ UT Data Analysis System ]

Advanced Filtering Function [ under development ]

16. Piping Inspection Technology [ Field Experience ]

-MHI has already applied this technology to cover 200 piping welds in domestic nuclear power plants.

17. Piping Inspection Technology [ MHI Point Focus Phased Array UT ]

-The elements with three dimensional curvature makes it possible to perform point focusing.
-The signal from the tip of small crack can be detected.

18. Piping Inspection Technology [ MHI Point Focus Phased Array UT ]

How to perform depth sizing ?
-Depth can be calculated based on the difference between Corner echo and Tip echo.

19. Piping Inspection Technology [ MHI Point Focus Phased Array UT ]

Correlation of UT sizing results and actual depth of crack

20. Alloy600 Inspection Technology [ Contents ]

-Alloy600 components in Japanese PWRs
-NDE Techniques applied to Alloy600 components
-ECT Technique for Nozzle Weld
-UT Sizing Technique for Nozzle Weld
-Field Experience for Nozzle Weld

21. Alloy600 Inspection Technology [ Alloy600 components in Japanese PWRs ]
22. Alloy600 Inspection Technology [ NDE Techniques applied to Alloy600 components ]
23. Alloy600 Inspection Technology [ ECT Technique for Nozzle Weld ]
24. Alloy600 Inspection Technology [ UT Sizing Technique for Nozzle Weld ]

-Typical UT Probe
-Typical UT Probe Attachment
-Example of UT Data

25. Alloy600 Inspection Technology [ UT Sizing Technique for Nozzle Weld ]
Good correlation between UT sizing results and actual depth of crack
26. Alloy600 Inspection Technology [ UT Sizing Technique for Nozzle Weld ]

Advanced Matrix PA-UT Probe
Advanced Matrix Phased Array UT is superior to Conventional UT for depth sizing.

27.Alloy600 Inspection Technology [ Field Experience for Nozzle Weld ]

-ECT indications were detected.
-UT Sizing results were in good agreement with actual depth.

28. SG Tubing Inspection Technology [ Contents ]

-MHI Intelligent ECT Probe Concept
-Feature of MHI Intelligent ECT Probe
-Advantage of MHI Intelligent ECT Probe
-Example of MHI Intelligent ECT Probe Data
-Field Experience in Japan and US

29. SG Tubing Inspection Technology [ MHI Intelligent ECT Probe Concept ]

-High speed acquisition equivalent to bobbin probe
-High detectability equivalent to rotating probe

30. SG Tubing Inspection Technology [ Feature of MHI Intelligent ECT Probe ]

-24ch driver pick-up type multi-array coil
-Thin-film pick-up coil enhances flaw detectability
-Built-in electronic circuits realize high S/N ratio
-Non-surface riding coil increases the probe life and durability of the probe

31. SG Tubing Inspection Technology [ Advantage of MHI Intelligent ECT Probe ]

Advantage
-High Speed and High Detectability
-Inclined drive coil is effective in both circumferential and axial flaw detection.
-Flaw direction (circ./axial) can be determined easily by Lissajous figure.

32. SG Tubing Inspection Technology [ Advantage of MHI Intelligent ECT Probe ]

Eddy current by inclined drive coil
Inclined drive coil is effective in both circumferential and axial flaw detection

33. SG Tubing Inspection Technology [ Advantage of MHI Intelligent ECT Probe ]
Flaw direction (circ./axial) can be determined easily by Lissajous figure.
34. SG Tubing Inspection Technology [ Example of MHI Intelligent ECT Probe Data ]

Example of Axial IDSCC signal at Tube Expansion

35. SG Tubing Inspection Technology [ Example of MHI Intelligent ECT Probe Data ]

Comparison with Intelligent ECT Probe and Conventional Rotating ECT Probe

36. SG Tubing Inspection Technology [ Field Experience in Japan ]

-MHI Intelligent ECT has been applied to Inconel Alloy600 tubes in Japan since 2003.
-As of March, 2009, there have been over 225,000 tubes examined.

37. SG Tubing Inspection Technology [ Field Experience in US ]

As of March, 2009, Intelligent ECT Probe was applied for 14 plants in US.

38. MHI Inspection Technology [ Conclusion ]

Our mission is to contribute to safe operation and life extension of the nuclear power plant at world wide by applying our inspection technology.

EJAM OT7: "The Latest MHI Inspection Technology for PWR Nuclear Power Plants in Japan " by MITSUBISHI HEAVY INDUSTRIES, LTD JAPAN