When the Analysts Leave, Who Answers for the Data?

In a steam generator eddy current inspection, there is a structured, multi-layered process designed to ensure accuracy, independence, and technical rigor.

Primary analysis.
Secondary analysis.
Resolution.
Independent Quality Data Analysis (IQDA).

Each layer exists for a reason. Each adds confidence to the final result.

But there is a reality that is rarely discussed outside of those who have lived through large outages:

The analysts leave.
The questions do not.

The System Is Built on Independence

At its core, the eddy current data analysis process is designed to prevent a single point of failure.

Primary and Secondary analyses are completely independent. One may be manual, the other automated. Both may be manual. Both may be automated using different systems.

The goal is not agreement.

The goal is independence.

When those two analyses are complete, the results are compared. Discrepancies are identified. That is where resolution analysis comes in.

Resolution is not just another review. It is an adjudication process. Experienced analysts, often Level IIIs with deep tubing experience, evaluate disagreements and make final determinations:

• Which indications are real
• Which are not
• Which are reportable
• Which require plugging

Then comes IQDA, a fourth layer that steps back and evaluates the entire process:

• Were downgraded calls justified?
• Were plug decisions appropriate?
• Did the system function as intended?

On paper, it is a robust system.

And it is.

The Hidden Reality of the Lead Level III

In theory, the Lead Level III is the technical authority over the inspection.

In practice, they are often the least exposed to the full dataset.

Not because they lack expertise.
But because they are responsible for everything else.

During an outage, the Lead Level III is typically:

• Managing data acquisition issues
• Coordinating with data management teams
• Communicating results to the client
• Addressing real-time problems across the project
• Reviewing database errors such as:
  • Incorrect test extents
  • Invalid three-letter codes
  • Mislocated indications

Most of the data they review is not raw inspection data across thousands of tubes.

It is selected data:

• Flagged indications
• Discrepant calls
• Items needing correction or verification

In other words, the Lead Level III is often looking at a curated subset of the inspection.

The Forest and the Trees

Eddy current analysis is not just about individual signals. It is about context.

Noise conditions across the generator.
Tube mill artifacts like buff marks.
Subtle variations in data quality.
Patterns that only emerge across large populations of data.

If a Lead Level III only sees selected indications, they may never develop a true feel for the inspection as a whole.

And that matters.

Because the questions they will eventually be asked are not about one tube.

They are about the entire inspection.

The Accountability Gap

Here is where things get real.

The Licensee owns the data.

But when questions arise, weeks or months later, those questions are not directed at the Primary analyst. Or the Secondary analyst. Or even the resolution team.

They are directed at the Lead Level III.

They may come from the client.
They may come from engineering.
They may come from oversight bodies like the U.S. Nuclear Regulatory Commission.

And the questions sound like this:

• What were the overall noise conditions?
• Were there any trends across the population?
• Why was this indication downgraded?
• How confident are you in the inspection results?

Those are not questions you can answer by reviewing a handful of flagged signals.

After the Outage Ends

When the outage is over, the analysis team moves on.

That is the nature of the business.

But the data remains.
The decisions remain.
The consequences remain.

And the Lead Level III becomes the long-term technical memory of that inspection.

They are the one expected to explain and defend what happened, often long after the people who performed the original analyses are no longer available.

What the Best Lead Level IIIs Do Differently

The most effective Lead Level IIIs understand this dynamic.

They do not rely solely on what is brought to them.

They make a conscious effort to:

• Sample tubes across the entire dataset
• Review clean data, not just flagged indications
• Observe overall signal conditions
• Build a mental baseline of noise, geometry, and data quality

This is not always required by procedure.

But it is required for true ownership.

Because at some point, the question will come:

What did you see?

Final Thought

The eddy current analysis process is designed with independence, redundancy, and verification at every level.

But in the end, responsibility is not distributed.

It concentrates.

The Licensee owns the data.

But when the analysts leave, the Lead Level III is the one who has to answer for it.

And you cannot answer for an inspection you never truly saw.

Call to Action

If you want to better understand the real-world challenges behind eddy current testing, data interpretation, and inspection leadership, visit eddycurrent.com.

It is built for technicians, analysts, engineers, and decision-makers who want more than textbook explanations. It is for those who want to understand how eddy current testing actually works in the field.