Design Modification to Mitigate the Reactor Inner Zone Inlet Header Temperature in a CANDU Reactor
Bibliographic record
Abstract
The Reactor Inner Zone Inlet Header (RIZIH) temperatures have raised more rapidly in the CANDU units in general, compared to the original aging predictions. The RIZIH high temperature alarms are required to be monitored to prevent operation outside the safe operating envelope as supported by the safety analysis. To prevent RIZIH temperature alarms, increasing RIZIH temperatures are being mitigated through changes in unit operating conditions which have caused power derates (as low as 87% Full Power) and a loss of revenue. In order to address the above concerns, a CANDU utility has initiated a study to evaluate multiple design alternatives and develop the best design option to improve RIZIH temperatures control. Seven design alternatives were assessed to a sufficient level based on their risk, suitability, economics, and effectiveness in managing RIZIH temperature with minimum system level impacts to interfacing systems. The study concluded that the external feedwater bypass of High Pressure Heater is the preferred option.
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.001 | 0.001 |
| Meta-epidemiology (narrow) | 0.001 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.001 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.001 | 0.000 |
| Open science | 0.001 | 0.000 |
| Research integrity | 0.001 | 0.001 |
| 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 source (direct Gemma or distilled Codex), 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".