TWO NEW NDE TECHNIQUES FOR INSPECTION OF CONTAINMENT WELDS BENEATH COATINGS

Award Information
Agency:
Nuclear Regulatory Commission
Branch
n/a
Amount:
$124,986.00
Award Year:
1990
Program:
SBIR
Phase:
Phase II
Contract:
n/a
Award Id:
10990
Agency Tracking Number:
10990
Solicitation Year:
n/a
Solicitation Topic Code:
n/a
Solicitation Number:
n/a
Small Business Information
Physical Research Inc. (Currently PHYSICAL RESEARCH, INC.)
2769 152 Avenue Ne, Redmond, WA, 98052
Hubzone Owned:
N
Minority Owned:
N
Woman Owned:
N
Duns:
n/a
Principal Investigator:
() -
Business Contact:
() -
Research Institution:
n/a
Abstract
INSPECTION OF PAINTED OR COATED CARBON STEEL SURFACES OFTEN INVOLVES THE REMOVAL OF THE COATING PRIOR TO INSPECTION, ESPECIALLY WHEN THE USE OF MAGNETIC PARTICLE TESTING (MT) IS REQUIRED. IN THE CASE OF EXAMINATION OF CONTAINMENT VESSEL WALLS IN NUCLEAR POWER PLANTS, THE REMOVAL IS TIME CONSUMING, RESULTING IN INCREASED RADIATION EXPOSURE TO WORKERS. IN ADDITION, THE REMOVAL MUST BE DONE WITHOUT CREATING AIRBORNE CONTAMINATION. IN THIS PROPOSAL, TWO NEW NDE TECHNIQUES ARE PROPOSED WHICH COULD LEAD TO IMPROVED INSPECTION METHODS AND ELIMINATE THE NEED TO REMOVE COATINGS. THESE METHODS WERE DEVELOPED FOR IMAGING OF CRACKS AND OTHER DEFECTS IN ALUMINUM, BUT SHOULD BE APPLICABLE TO CARBON STEELS AS WELL, WITH MODIFICATIONS. THESE TECHNIQUES INVOLVE THE USE OF MAGNETO-OPTIC IMAGING, WHICH PRESENTS DIRECT, REAL TIME IMAGES OF DEFECTS THROUGH THE PERTURBATIONS THEY CAUSE IN INDUCED MAGNETIC FIELDS WITHIN THE PART BEING INSPECTED, ANDA SIMILAR APPROACH USING HALL-EFFECT SENSORS TO DETECT THE MAGNETIC FIELD PERTURBATIONS. A NOVEL METHOD INVOLVING SHEET CURRENT INDUCTION FOR MAGNETIZATION OF THE COMPONENT IS USED WITH THESE TECHNIQUES. BOTH METHODS SHOULD BE LESS SENSITIVE TO LIFTOFF OR COATING THICKNESS SINCE THEY DEPEND ON THE FIELD STRENGTH AND NOT THE FIELD GRADIENT AS DOES MT.

* information listed above is at the time of submission.

Agency Micro-sites


SBA logo

Department of Agriculture logo

Department of Commerce logo

Department of Defense logo

Department of Education logo

Department of Energy logo

Department of Health and Human Services logo

Department of Homeland Security logo

Department of Transportation logo

Enviromental Protection Agency logo

National Aeronautics and Space Administration logo

National Science Foundation logo
US Flag An Official Website of the United States Government