E-Journal of Advanced Maintenance (EJAM)


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	A New Mechanical Condition-based Maintenance Technology Using Instrumented Indentation Technique
	Survey robots for Fukushima Daiichi Nuclear Power Plant

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Occasional Topics

OT8 (2010-1-28)

Hitachi Inspection Technology for Nuclear Power Plant

Masahiro Tooma*
Yoshiaki Nagashima*
Masahiro Koike**
Kojiro Kodaira**
*Hitachi, Ltd., Energy & Environmental Systems Laboratory
**Hitachi-GE nuclear energy, Ltd.

KEYWORDS：
Eddy Current Testing, Ultrasonic Testing, Phased Array, Underwater Vehicle, Inspection Technology, Stress Corrosion Crack, Length Sizing, Depth Sizing, Core Internals, Nuclear Power Plant

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1. Hitachi Inspection Technology for Nuclear Power Plant
	Masahiro Tooma Yoshiaki Nagashima Hitachi, Ltd., Energy & Environmental Systems Laboratory Yutaka Kometani Masayoshi Sonobe Masahiro Koike Kojiro Kodaira Hitachi-GE nuclear energy, Ltd.
2. Contents
		1. Introduction (Overview) 2. Eddy current testing (ECT) 3. Phased array UT 4. Underwater vehicle 5. Conclusion
3. Overview of Hitachi Inspection Technology for NPP
		Inspection/Monitoring Technology - Eddy Current Testing (ECT) - Ultrasonic Testing (UT) - Underwater Vehicle (ROV) - Guided Wave Inspection - Radiation Monitoring
4. Objectives of Bottom Head Inspection
		Integrity Evaluation of Components at Bottom Head - Welded to the Reactor Pressure Vessel (RPV) - Nickel Alloy (SCC) Nondestructive Testing (NDT) - Detection of Stress Corrosion Crack (SCC) - Length and Depth Sizing Measurement
5. Contents
		1. Introduction (Overview) 2. Eddy current testing (ECT) 3. Phased array UT 4. Underwater vehicle 5. Conclusion
6. Purpose of flexible Multi ECT Inspection
	Conventional ECT - Single ECT sensor : High sensitivity for SCC, but difficulty to apply to the complicated area Purpose - Expanding inspection area to BHD - Idea Rapid inspection: Multi coils Complicated area inspection: Flexible sensor Noise reduction: Phase mapping method
7. Flexible Multi-coil ECT System
	Eddy current sensor ECT software display
8. SCC Identification
	Mockup Result of Identification - We have developed an automatic crack signal identification system.
9. Crack Length Sizing
		Crack length sizing method was authorized by JAPEIC.
10. Access tools
		6-axes robot arm
11. Contents
		1. Introduction (Overview) 2. Eddy current testing (ECT) 3. Phased array UT 4. Underwater vehicle 5. Conclusion
12. Array Sensors for OD Side of RPV
	Optimization by UT Simulation
13. Equipment (2): Phased Array System
	Electric Scanning of Ultrasonic Beam: Controlled by Phased Array System
14. Equipment (1): Automated Scanners
	Array Sensor: Scanned on the OD Surface of RPV by Automated Scanner mounted on the Guide Rail - H9 Shroud Support - H11 Shroud Support
15. Results: H9(1) Horizontal Notch
	Horizontal Notch SN Ratio of Tip Echo: More than 6dB
16. Results of Depth Sizing (Notches)
	Sizing accuracy for horizontal and vertical notches is less than 3mm (< ASME Code 0.125 inch)
17. Features of 3D Phased Array UT
18. Data Acquisitions for 3D Scans
	Fast data acquisitions by 256 simultaneously active elements
19. Applications / FBHs in Metal Test Piece
	- Metal Test Piece - 3D Image of FBH Scanned results can be evaluated at one time in a 3D view. Echoes can be easily related to the reflection sources with the help of CAD data
20. Applications / Bolt Inspections
	- Bolts (Φ24) - 3D Image of Thread and Slit Bolt inspections can be performed without any mechanical motions.
21. Contents
		1. Introduction (Overview) 2. Eddy current testing (ECT) 3. Phased array UT 4. Underwater vehicle 5. Conclusion
22. ROVs Lineup
23. C-type ROV
	Detail of the C-type ROV
24. Inspection ROV : Specifications
25. The vector control using multiple thruster
	Generate any motion by allocating thrust force to five thruster
26. The experimental result of the hovering control
	Experimental setup Appearance of the experiment Experimental result
27. Conclusion
	To carry out efficient inspection for core internal, shroud support and bottom mounted instrument of reactor pressure vessel, we have developed the flexible multi-coil ECT system for novel identification and length sizing of surface breaking crack, the phased array UT system for depth sizing of sub-surface breaking crack in thick-wall structure, the remotely operated vehicles with these sensors.

EJAM OT8: "Hitachi Inspection Technology for Nuclear Power Plant" by Masahiro Tooma (Hitachi, Ltd), Yoshiaki Nagashima (Hitachi, Ltd), Masahiro Koike (Hitachi-GE nuclear energy, Ltd.) and Kojiro Kodaira(Hitachi-GE nuclear energy, Ltd.)


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