cracked workmanship samples facilitate radiation field remote inspection · 2012. 6. 26. · the...

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Cracked Workmanship Samples Facilitate Radiation Field Remote Inspection

Larry R. Zirker

James A. Dowalo

Idaho National Laboratory

TMI-II Dry Canister Welds

• State of Idaho/INL/DOE

• Canister Welding and Remote Inspection Systems

• Validation for NRC

• Delemna/Paradox

• Cracked Mock-up Weld

Crack the Weld

Solution to Problem

See the Crack

Dry Storage In-Service Inspection Delemna

• Inspection of TMI-II Purge Port Welds

• Radiation Field

• Remote Fiber-Optic Inspection System

• No Tribal Knowledge/Procedures/Skills

• No Cracked Workmanship Sample Block

Making a Cracked Block

12

6

39

Top View of DSC Weld Block

Side View of DSC Weld Block

1.5 inch thick top plate

Sheet metal strips

0.5-inch thick

bottom plate

Four numbered “Clock” locations

12

6

39

Top View of DSC Weld Block

Side View of DSC Weld Block

1.5 inch thick top plate

Sheet metal strips

0.5-inch thick

bottom plate

Four numbered “Clock” locations

Sample Block

ATR Canal Storage Rack Weld Inspection Project

• Underwater Inspection

• Remote Fiber-Optic Inspection System

• No Tribal Knowledge/Procedures/Skills

• No Cracked Workmanship Sample

Fillet and Butt Weld Cracked Block

Lessons Learned

• Training tool for crews

• Validation tool for fiber-optic inspection system

• Compare direct viewing and viewing angle

• Inspection document

Underwater Photos

Code Inspection

• What could normally be detected with direct access to sample:

Document Technique