Bibliographic record
Abstract
Delayed Hydride Cracking (DHC) in Zr-2.5Nb alloy material is of interest to the CANDU (Canada Deuterium Uranium) industry in the context of the potential to initiate DHC at a blunt flaw in a CANDU reactor pressure tube. Modelling and experimental programmes have led to the development of a flaw evaluation procedure that is based on the process-zone methodology, and which has been incorporated into a Canadian Standards Association (CSA) Standard N285.8 for evaluation of fitness-for-service of Zr-2.5Nb pressure tubes. A key feature of the procedure is the importance that has been given to the effect of flaw profile, and in particular the effect of flaw root radius, which implicitly assumes that the flaw root profile is locally parabolic. It is against this background that the paper highlights the characteristics of smooth bottomed flaws that do not have a locally parabolic root profile. Such flaws, even though they are smooth bottomed can have a zero root radius of curvature, according to the accepted mathematical formula for root radius. The paper is a preliminary attempt at discussing the behaviour of non-parabolic root profile flaws, which clearly more closely resemble service flaws than parabolic root profile flaws, in view of their generality. It emphasises the desirability of linking the non-parabolic and parabolic flaw behaviours, so that, when evaluating a flaw found during service, advantage can be taken of the results from the parabolic flaw modelling and experimental programmes.
Fetched live from OpenAlex and de-inverted. Abstracts are not stored in this database: the inverted indexes are 8.6 GB of the frame’s 9.3 GB of text, and the host has 13 GB free.
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) | 0.005 | 0.001 |
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; both teacher heads agree on what is shown here.
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".