In-Reactor Experiments to Enhance Neutron Noise Analysis Techniques for Vibration Monitoring
Bibliographic record
Abstract
Abstract The diagnostic potential of neutron noise induced by mechanical vibrations in the Zero Energy Deuterium (ZED-2) research reactor at Canadian Nuclear Laboratories (CNL) was experimentally investigated. A vibrating neutron-absorber plate was used to induce neutron flux fluctuations, measured using six in-core neutron flux detectors and an ex-core radial ion chamber. The absorber plate vibration was precisely controlled with a custom-designed miniature shaker. Results showed that oscillations at discrete frequencies generated neutron flux perturbations across the reactor core, with the strongest response observed near the vibrating plate. Flux amplitudes were frequency-dependent, with higher responses at lower frequencies. Even small plate oscillations of 0.2 mm (zero-to-peak) produced detectable flux variations up to four fuel channel sites away. The preliminary results of this study are the first to experimentally demonstrate harmonic generation—a non-linear phenomenon that occurs under conditions of significant neutron perturbation.
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How this classification was reachedexpand
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 itClassification
machine, unvalidatedMachine predicted; a candidate call from one teacher head, not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".