Heat Transfer Assessment of Calandria Tube Enhancement Design Options
Bibliographic record
Abstract
The moderator in the Calandria of a CANada Deuterium Uranium (CANDU) reactor serves as a backup heat sink in a Loss of Coolant Accident (LOCA) combined with a Loss of Emergency Coolant Injection (LOECI) accident scenario. This requires that the heat from the fuel be transferred through the ballooned/sagged Pressure Tube and the contacted Calandria Tube (CT) to the moderator. Increasing the heat transfer to the moderator will enhance the safety of the reactor by increasing the margin to Calandria Tube Rupture and ensuring the fuel is cooled. Conceptual designs were assessed to determine their potential for increasing heat transfer to the moderator in accident scenarios. Three different design options for a CT have been investigated using numerical simulation techniques. The CT design options include fins or ribs of different sizes and combinations. The fins and ribs provide improved heat transfer. Analyses results have shown that the design options yield an increased heat transfer with a minimal impact on moderator flow. The analysis has determined that the ribbed design option is superior in terms of heat transfer enhancement.
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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".