A Flow-Impingement Facility for Corrosion and Electrochemical Studies in High–Temperature Aqueous Solutions
Bibliographic record
Abstract
Abstract A flow-impingement facility has been developed at the AECL Chalk River Laboratories to study flow accelerated corrosion (FAC) and the electrochemical behaviour of reactor and steam generator (SG) materials. Tests can be done under conditions simulating a nuclear power plant heat transport system (HTS) and SG operation. High-temperature water is pumped through nozzles, impinging on the surface of test samples, and simulates turbulent flow conditions for accelerated corrosion tests. The flow-impingement stand was installed in a once-through autoclave system. Tests can be performed under impinging flow at temperatures up to 330°C. The maximum linear velocity of the impinging jet can be as high as 6 m/s at 300°C. Mass transfer coefficient calculations indicate that the hydrodynamic conditions under the impinging jet are equivalent to that in a 2.5-inch tube at free flow velocities between 12 to 18 m/s. This facility can be used to verify the corrosion rate of material as a function of temperature and key water chemistry parameters, such as pH, oxygen concentration, etc., in flowing high-temperature water. Accelerated corrosion tests and a variety of electrochemical measurements can also be performed under well controlled hydrodynamic and chemistry conditions using this facility. An overview will be provided of some of these test results, and their application to operating plant issues.
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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".