Probabilistic Assessment of Dissimilar Metal Welds in CANDU Reactors
Why this work is in the frame
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Bibliographic record
Abstract
Dissimilar metal welds (DMWs) involving Alloy 600 and its equivalent weld metal, such as Alloy 82 are used in a number of outlet feeders in CANDU® reactors. The higher operating temperature (∼300°C) leads to concerns that primary water stress corrosion cracking (PWSCC) might occur. This paper demonstrates the low rupture probability of DMWs due to PWSCC using probabilistic fracture mechanics (PFM) method with several critical assumptions validated by experiments. The leak-before-break is also demonstrated by comparison of the leak probability with rupture probability. A sensitivity study is carried out to investigate the effect of various factors on failure probabilities. Credible leak detection and action play an important role in limiting the rupture probability, while in-service inspection (ISI) has little effect to reduce rupture probability.
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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