DOE Phase II SBIR Project: Diagnostics of Chlorine Induced Stress - - PowerPoint PPT Presentation

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DOE Phase II SBIR Project: Diagnostics of Chlorine Induced Stress Corrosion Cracking Using Laser Ultrasonics SFWST Working Group Meeting May 22-24, 2018 Max Wiedmann and Marvin Klein Intelligent Optical Systems Torrance, CA 90505

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DOE Phase II SBIR Project: Diagnostics of Chlorine Induced Stress Corrosion Cracking Using Laser Ultrasonics

SFWST Working Group Meeting May 22-24, 2018 Max Wiedmann and Marvin Klein Intelligent Optical Systems Torrance, CA 90505 www.intopsys.com/laserultrasonics

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Outline

 Laser ultrasonic testing

− Introduction − Benefits

 Project goals and description  Project team  Project progress and results

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Laser Ultrasonic Testing (LUT): System Layout

Base Station Fiber Umbilical

I O

Receiver Pulsed Generation Laser Measurement Head Sample with Crack

Remote base station with fiber delivered measurement head

CW Probe Laser Fiber Coupler

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Benefits of Laser Ultrasonic Testing (LUT)

 Noncontact: Lasers generate and detect ultrasound  Operates on rough, curved, corroded surfaces  Small laser spots enable isolation of individual cracks  High bandwidth for accurate depth measurement  Small, fiber-delivered measurement head enables

access to confined spaces

 Purely optical inspection probe, no electronics

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Broad Goals of DOE SBIR

 Technical: demonstrate that LUT can measure

the depth profile (depth vs. position) of a stress corrosion crack with acceptable accuracy

 Integration: demonstrate a practical means for

delivering and scanning the beams inside a DCSS, in the presence of radiation and heat

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DOE SBIR Phase II Team

 Intelligent Optical Systems: project lead; laser ultrasonic

technology

 RTT: robotic integration  EPRI: access to mockup and eddy current system for

demonstration

 Diakont, Structural Integrity: NDE guidance  Randy Granaas – Southern California Edison (SONGS) and

Matt Keene – Duke Energy: industry guidance

 Prasad Nair – DOE NV: Technical Monitor

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Basic B-Scan Pattern

Generation Detection

Experiments performed on EDM notches and real SCC cracks

Crack

Scan along full length of crack

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Beam Configuration: Time of Flight Diffraction

Detection beam Generation beam Scanning into page Generated ultrasonic pulse from surface ablation

Sample

Rayleigh wave Skimming L wave Incident L wave Diffracted L wave (LL) EDM notch

r crack

Technical objective: detect diffracted longitudinal (L) wave Time delay gives notch or crack depth

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EPRI EDM Notch Samples

Curved Shape; Each With Four Notches

Sample 6 13.0 mm thick Sample 7 16.6 mm thick Sample 8 16.6. mm thick

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Sample 6, Flaw 1

Apparent notch depth profile is

flat, not curved as drawn above

Notch is very tight, as indicated

by remnant skimming wave signal over notch

Measured crack depth of 6.1

mm agrees with stated depth of 6.55 mm.

Skimming wave Notch-diffracted LL wave Flaw properties Extent of crack Rayleigh wave

Time delay

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Fatigue Crack Sample From Trueflaw (Finland):

Crack Specifications

Destructive testing: 6.4 mm

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Photo of Crack

30 mm

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Crack B-Scan

LL crack diffracted wave shows depth profile

Physical extent

f crack

LL crack diffracted wave Rayleigh wave is interrupted over crack 2L Backwall Skimming L wave

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Crack Depth Profile Determined from LL Arrival

5.7 mm Time of flight measurement is very accurate (20 ns) Crack depth accuracy depends on signal processing algorithm

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Fatigue Crack from FlawTech

25 mm Stated crack depth: 2.64mm

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FlawTech Fatigue Crack

Physical extent

f crack

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Crack Depth Profile Plot

2.7 mm

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Miniaturization of Measurement Head

Miniaturized probe produced for separate application. The probe in development will have similar dimensions and will be modified to measure perpendicular to the direction of the fiber inputs.

Generation fiber Detection fiber

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DCSS Inspection Integration

DCSS Concrete Overpack DCSS Cannister Wall Crack LUT Measurement Head with inspection laser beams Magnetic Robotic Crawler Combined Umbilical

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3D Render of IOS Probe on RTT Crawler Inside of a DCSS

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Phase II Progress and Future Work

Task Status

Demonstrate crack depth profiling with LUT

Complete

Refine beam configuration and signal processing

In progress

Design and construct miniature, fiber-delivered probe

In progress

Integrate probe onto RTT crawler

In progress

Test and demonstrate full system

n EPRI mockup

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Thank You!

 Contact information:

− mwiedmann@intopsys.com − Office: 424-263-6329 − Cell: 805-259-5681 − www.intopsys.com/laserultrasonics