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NDT Companies

Best Nuclear NDT Inspection Companies

Nuclear NDT inspection is the most regulated and technically demanding segment of the non-destructive testing industry. Companies performing in-service inspection (ISI) at nuclear power plants must comply with ASME Section XI requirements, hold NRC-endorsed qualifications, and maintain quality programs conforming to 10 CFR 50, Appendix B and ASME NQA-1. Inspection personnel must be qualified under ASME Section XI, Appendix VII (UT) or VIII, or the EPRI Performance Demonstration Initiative (PDI) for volumetric inspection methods. Finding a qualified nuclear NDT provider requires verifying their nuclear-specific qualifications, not just general ASNT certifications — nuclear inspection is a distinct technical discipline with regulatory consequences for non-compliance.

Why these suppliers?

  • ✓Nuclear NDT companies listed here have maintained quality programs under ASME NQA-1 and 10 CFR 50 Appendix B — the regulatory baseline for nuclear-grade inspection documentation and corrective action programs.
  • ✓Personnel at these companies hold nuclear-specific qualifications (ASME Section XI, PDI) that go beyond general ASNT certification, having demonstrated detection capability on representative mockups with real or implanted flaws.
  • ✓Nuclear NDT companies with fleet-wide ISI experience bring familiarity with utility inspection programs, outage planning, NRC interface requirements, and the documentation standards required to support license renewal and continued safe operation.

1 verified supplier found

Weld Inspection Services LLC
Riverview, Florida5.0(4)

Ultrasonic Testing is a volumetric inspection which means that internal flaws in weldments and raw materials can be detected throughout the thickness of the part. WIS has experience in complying with customer specifications and multiple industrial standards such as AWS, ASME, API, and more.

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Frequently Asked Questions

What qualifications are required for nuclear NDT inspection?
For in-service inspection (ISI) at commercial nuclear power plants, UT personnel performing volumetric inspection must be qualified under ASME Section XI, Appendix VII (general UT) or Appendix VIII (performance demonstration). The PDI (Performance Demonstration Initiative) program, administered by EPRI, provides the examination infrastructure for Appendix VIII qualification. Personnel also need general ASNT Level II or III certification as a baseline. Companies must maintain a quality program compliant with ASME NQA-1 and have an approved Examination Procedure Specification (EPS) for the inspection scope.
What is the ASME Section XI inspection program for nuclear plants?
ASME Section XI establishes the rules for in-service inspection of nuclear power plant components. It defines inspection categories (B-A through B-P for pressure-retaining welds, and Class 1, 2, and 3 components), inspection intervals, examination coverage requirements, and acceptance standards. Each plant's ISI program must comply with Section XI as part of its NRC operating license. During refueling outages, ISI inspections are conducted on a scheduled basis, with NDT companies performing examinations of reactor pressure vessel welds, primary system piping, and other safety-significant components.
How do I qualify an NDT company for nuclear power plant work?
Request a copy of the company's ASME NQA-1 Quality Assurance program documentation and their current Approved Supplier List (ASL) status with comparable utilities. Verify that their UT personnel hold current Appendix VIII/PDI qualifications for the weld configurations and base materials in your plant. Review their EPS (Examination Procedure Specifications) to confirm procedural coverage. Conduct a pre-job briefing to verify the company understands your plant's configuration, access conditions, and outage schedule constraints. Many utilities also require a qualification audit or mock-up examination prior to awarding ISI scope.

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