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

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

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

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.

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

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

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

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

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

Advanced Filtering Function [ under development ]

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

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

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

Correlation of UT sizing results and actual depth of crack

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

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

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

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

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

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

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.

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

Example of Axial IDSCC signal at Tube Expansion

Comparison with Intelligent ECT Probe and Conventional Rotating ECT Probe

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.

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

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