Pulsed Eddy Current Inspection of Wall Loss in Steam Generator Trefoil Broach Supports
Why this work is in the frame
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Bibliographic record
Abstract
Inspection for corrosion in steam generator (SG) tube support structures is a significant component of monitoring SG condition, since support degradation can lead to SG tube flaws, and thereby further SG deterioration. A pulsed eddy current probe was developed to augment SG inspection at carbon steel trefoil broach supports. The probe demonstrated capability to measure far side wall loss as small as 20% of the original 2.7-mm-thick broach support ligament from within the Alloy 800 SG tube. A power law fit of the data was found to describe signal variation at later times under conditions of varying wall thickness and lift-off. The associated power law exponent varied linearly with wall thickness and was observed to be largely independent of lift-off and angular orientation of the probe, identifying it as a potential parameter for ligament wall thickness monitoring. Voltage response integrated over time also provided a low-noise means of measuring the wall loss when lift-off variation and misalignment were not present.
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Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.000 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from it