Analysis of accelerated irradiation growth in Zr-2.5% Nb pressure tubes
Bibliographic record
Abstract
Abstract Recent experimental evidence of creep and growth of Zr—2.5% Nb CANDU pressure tubes under irradiation shows an increase in the growth rate with accumulated fluence. Such a feature has been linked to a climb of c-type dislocation loops produced by a bias in the migration of vacancies and interstitials. In this work we link several material scales in order to relate the macroscopic response of the tubes with the physical mechanisms involving the point defects on the microscopic scale. Our model includes the influence of internal stresses on defect diffusivity, the dependence of creep and growth moduli of the single crystal on the evolving microstructure, and the intergranular stresses responsible for the bias. All these elements are combined in a self-consistent polycrystal model for creep and growth. We show that this approach can explain the observed growth acceleration and we derive physically meaningful values of some of the microstructural parameters.
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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 | 0.001 | 0.000 |
| Meta-epidemiology (narrow) | 0.001 | 0.001 |
| Meta-epidemiology (broad) | 0.002 | 0.000 |
| Bibliometrics | 0.000 | 0.001 |
| Science and technology studies | 0.000 | 0.001 |
| Scholarly communication | 0.000 | 0.001 |
| Open science | 0.001 | 0.000 |
| Research integrity | 0.001 | 0.001 |
| Insufficient payload (model declined to judge) | 0.004 | 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".