Fission Product and Structural Material Speciation during the Phebus-FPT1 Transient
Notice bibliographique
Résumé
Phebus-FP is an international integrai experimental programme initiated the French Institute de Radioprotection et de Suretè Nucléaire (IRSN), the European Commission and 'Electricité de France'. Its objective is to investigate the main phenomena involved in Light Water Reactors severe accidents through six in-pile tests. The test facility simulates cure, primary circuit and reactor containment of a PWR, with a scaling factor of about 5000. The programme is also sponsored by USA (NRC), Japan (NUPEC and JAERI), Canada (COG), Korea (KAERI) and Switzerland (PSI and HSK). The first two experiments (Phebus-FPT10 and Phebus-FPTl) were performed on December 2, 1993 and three years later, on July 26, 1996, respectively. Afterwards, Phebus-FPT4 (on July 22, 1999)and Phebus-FPT2 (on October 12, 2000) were carried out. The Phebus-FPT1 test bundle was constituted by 18 fuel rods with a fission length of 1 m previously irradiated in light water reactor BR3, 2 fresh fuel rods and 1 silver-indium-cadmium control rod. The bundle has been then irradiated for 7 days in the Phebus reactor in order to produce the short lived fission product. During the transient it was heated progressively up to a large fraction or the fuel was liquefied. The chemical environment created during the Phebus-FPT1 transient contained a large number of species, generated at variable temperature by fission product, structural material, fuel and steam, and this produced a very complex chemistry. To date, the presence of a gaseous species of iodine in the hot leg of the primary circuit during the zircaloy oxidation phase has not been completely interpreted, even though a number of possible and different explanations have been widely discussed. For certain, it would seen quite confirmed that the fraction of gaseous iodine arriving to containment (supposed to be HI) is not correlated with the increase of the hydrogen concentration. This paper reports the results of a study carried out in order to contribute solving this problem. It is based on the determination by the HSC 5.1 Computer Program of the fission product and structural material speciation in the Phebus-FPT1 core during the transient. In addition, this could consent the introduction of some simplification for the relative kinetics calculation. The results have indicated mainly that: - At temperatures higher than 1000°K, CsI, InI, Hi, and I are the dominant gaseous iodine species. Other estimated important species, such as CdI, CdI2, AgI, are nearly absent far all conditions. ' - The percentage of HI formed increases when the percentage of H2 and the Cs/In ratio decrease. The formation of HI would seem linked to the competing equilibria of the species of indium. - The transport of gaseous iodine to containment should occur, at least partially, by m and perhaps a Utile fraction of the initial InI(g). The significant formation of InI(g) justifies the gaseous iodine fraction that was found in the hot leg of the primary circuit.
Récupéré en direct depuis OpenAlex et désinversé. Les résumés ne sont pas conservés dans cette base de données : les index inversés représentent 8,6 Go des 9,3 Go de texte de la base, et le serveur dispose de 13 Go libres.
Comment cette classification a été obtenuedéplier
Prédiction distillée sur la base complète
Imitation des enseignantsNi prévalence calibrée, ni vérité terrain. Validation humaine à venir. Apprise à partir de 10 348 étiquettes directes de Codex et de 10 348 étiquettes directes de Gemma. Le mode candidate est l'union des têtes enseignantes seuillées; le consensus est leur intersection. Ces sorties portent le statut machine_predicted_unvalidated et ne sont ni des étiquettes humaines ni des étiquettes directes de modèles de pointe.
Scores Codex et Gemma par catégorie
| Catégorie | Codex | Gemma |
|---|---|---|
| Métarecherche | 0,000 | 0,000 |
| Méta-épidémiologie (sens strict) | 0,000 | 0,000 |
| Méta-épidémiologie (sens large) | 0,000 | 0,000 |
| Bibliométrie | 0,000 | 0,000 |
| Études des sciences et des technologies | 0,001 | 0,000 |
| Communication savante | 0,000 | 0,000 |
| Science ouverte | 0,001 | 0,001 |
| Intégrité de la recherche | 0,000 | 0,000 |
| Charge utile insuffisante (le modèle a refusé de juger) | 0,002 | 0,000 |
Scores machine (provisoires)
Les deux têtes enseignantes du modèle étudiant, lues sur ce travail. Un score ordonne la base pour la relecture; il n'affirme jamais une catégorie, et le statut de validation accompagne chaque rangée tel quel.
Scores de référence d'un modèle non mature (critères de maturité non atteints, 7 itérations). Un score ordonne; il n'affirme jamais une catégorie.
score_only:v0-immature-baseline · tel quel depuis la passe de notation : score_only signifie que le nombre peut ordonner les travaux, et qu'aucune étiquette de catégorie n'en découleClassification
machine, non validéePrédiction automatique; un appel candidat d’une seule tête enseignante, pas un consensus.
Le détail, modèle par modèle et score par score, se trouve en fin de page sous « Comment cette classification a été obtenue ».