The ACR: Advanced Design Features for a Short Construction Schedule (S494)
Bibliographic record
Abstract
Through their worldwide operating records, CANDU ® Nuclear Power Plants have repeatedly demonstrated safe, reliable and competitive performance.Atomic Energy of Canada Limited's (AECL) Advanced CANDU Reactor -the ACR ® -is the genesis of a new generation of technologically advanced reactors founded on the CANDU reactor concept.The ACR is the next step in the evolution of the CANDU product line.The ACR products (ACR-700 and ACR-1000) are based on the proven CANDU technology and incorporate advanced design features and technologies.Currently there are fourteen single unit CANDU 6 reactors operating or under construction worldwide.The first CANDU 6 reactors went into service in Canada and overseas in the early 1980s.The latest two units are at the Qinshan site in China.Prior to the Chinese units, construction had been relatively conventional.The project schedule for the first Chinese unit was 72 months with a 47 month construction period duration from First Concrete to Fuel Load.The first unit was completed 38 days ahead of schedule.Building on the successful CANDU construction at Qinshan, the ACR-700 is designed with constructability considerations as a major requirement during all project phases from the concept design stage to the detail design stage.A project schedule of 48 months has been developed for the nth ACR unit with a 36 months construction period from First Concrete to Fuel Load.This paper describes some of the advanced design features implemented in the reactor building design in order to achieve this short construction period.These features include large volume concrete pours, prefabricated rebar, composite structures, prefabricated permanent formwork and significant modularization and prefabrication.
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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 | 0.002 | 0.003 |
| Meta-epidemiology (narrow) | 0.002 | 0.001 |
| Meta-epidemiology (broad) | 0.001 | 0.001 |
| Bibliometrics | 0.002 | 0.001 |
| Science and technology studies | 0.001 | 0.000 |
| Scholarly communication | 0.002 | 0.001 |
| Open science | 0.001 | 0.002 |
| Research integrity | 0.001 | 0.001 |
| Insufficient payload (model declined to judge) | 0.631 | 0.521 |
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".