Prise en compte des conditions des matériaux et du couplage axial le long d'un canal du réacteur refroidi à eau supercritique canadien
Bibliographic record
Abstract
Ce projet de recherche a etabli une strategie de simulation capable de prendre en compte les profils de conditions des materiaux et le couplage axial le long d’un canal de combustible du reacteur refroidi a eau supercritique canadien. La strategie de simulation proposee resout l’equation de transport pour le canal complet en geometrie exacte sans avoir a faire de calcul direct en trois dimensions. La strategie de simulation proposee consiste a realiser une serie de calculs de cellules unitaires en deux dimensions suivie d’un calcul de canal en une dimension. Il a ete demontre que la strategie de simulation proposee est equivalente au calcul d’un canal en trois dimensions dans des limites raisonnables. Pour cette demonstration, SERPENT 1.1.16 a ete utilise pour realiser les calculs de canal en trois dimensions ainsi que les calculs de cellules unitaires en deux dimensions et DRAGON 3.06 a ete utilise pour realiser les calculs de canal en une dimension. A partir d’un canal complet et de canaux partiels en trois dimensions avec reflecteur axial,ce projet de recherche a evalue l’impact du reflecteur axial sur les proprietes neutroniques du canal et inversement, l’impact des plans de combustible sur les proprietes neutroniques du reflecteur axial. Il a ete observe que le reflecteur axial affecte surtout les proprietes neutroniques des plans de combustible adjacents a celui-ci et que la precision des proprietes neutroniques du reflecteur axial augmente lorsque le nombre de plans de combustible dans les canaux partiels augmente. En deuxieme partie, ce projet de recherche a demontre l’applicabilite de la strategie de simulation proposee dans la chaine de calculs utilisee conventionnellement en neutronique et a evalue son impact sur les proprietes neutroniques du coeur du reacteur refroidi a eau supercritique canadien. Pour ce faire, la strategie de simulation proposee a entierement ete modelisee a partir des fonctionnalites de DRAGON 3.06 et le reacteur refroidi a eau supercritique canadien a ete modelise avec DONJON 3.02. Quatre modeles de bases de donnees reacteur ont ete developpes. Le modele de la cellule isolee ne fait appel qu’a une seule cellule unitaire et n’y fait varier que la composition du combustible au cours du temps. Le modele des quatorze cellules isolees prend en compte les profils de conditions des materiaux le long du canal.----------Abstract This research project has established a simulation strategy capable of taking into account the conditions of the materials and the axial coupling along a fuel channel of the Canadian Supercritical-Water-Cooled Reactor (SCWR). The proposed simulation strategy solves the transport equation for the complete channel defined in exact geometry without having to make three-dimensional calculation. The proposed simulation strategy consists of making a series of two-dimensional lattice cell calculations followed by a one-dimensional slab geometry calculation. It has been shown that the proposed simulation strategy is equivalent to a three-dimensional channel calculation within reasonable limits. For this demonstration, SERPENT 1.1.16 is used to perform the three-dimensional channel calculations and the two-dimensional lattice cell calculations while DRAGON 3.06 is used to perform the one-dimensional slab geometry calculations. From three-dimensional complete and partial channels with axial reflector, this research project has assessed the impact of the axial reflector on the channel neutronic properties and inversely, the impact of the fuel planes on the axial reflector neutronic properties. It was observed that the axial reflector affects mainly the neutronic properties of the fuel planes adjacent to the axial reflector and that the accuracy of the axial reflector neutronic properties increases as the number of fuel planes in the partial channels increases. In the second part, this research project has demonstrated the applicability of the proposed simulation strategy in the calculation chain conventionally used in neutronics and has evaluated its impact on the SCWR core neutronic properties. To do this, the proposed simulation strategy was entirely modeled using DRAGON 3.06 and the complete SCWR core was modeled with DONJON 3.02. Four models of reactor database were developed. The model of the isolated unit cell uses only one unit cell and changes only the fuel composition over time. The model of the fourteen isolated unit cells takes into account the conditions of the materials along the channel. The models of the fourteen coupled unit cells take into account the conditions of the materials and the axial coupling along the channel by implementing the proposed simulation strategy.
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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 | 0.002 | 0.001 |
| Meta-epidemiology (narrow) | 0.001 | 0.001 |
| Meta-epidemiology (broad) | 0.001 | 0.000 |
| Bibliometrics | 0.001 | 0.001 |
| Science and technology studies | 0.001 | 0.001 |
| Scholarly communication | 0.001 | 0.002 |
| Open science | 0.001 | 0.000 |
| Research integrity | 0.001 | 0.002 |
| 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".