Effect of Surface Finish on Corrosion and Deuterium Pickup in Zr-2.5Nb Pressure Tubes
Bibliographic record
Abstract
Abstract Historically, different surface finishes have been used on the inside surface of pressure tubes prior to the stress-relieving steam autoclave exposure of 400°C for 24 hours. The surface finish may affect the corrosion and deuterium ingress rates in pressure tubes. Corrosion tests on coupons prepared from a pressure tube with different surface finishes were conducted in static autoclaves at 300°C and in a heavy-water re-circulating loop in the Halden Boiling Water Reactor at 325°C under water chemistry conditions similar to that in the CANDU®1 reactor heat transport system. The surface finishes included: pickled, pickled and pre-filmed, abraded, abraded and pre-filmed, machined, machined and pre-filmed and shot peened and prefilmed. The pre-filming consisted of a steam exposure at 400°C for 24 hours. In this paper, the results on the effect of surface finish on corrosion and deuterium ingress in pressure tubes is reported. Surface finish affects the corrosion and deuterium pickup rate with pickled coupons having higher rates than those with an abraded, machined or pre-filmed surface finish.
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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) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.001 | 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) | 0.002 | 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".