Towards a Uniform Description of Recombiners Performance by a Consistent CFD approach with the use of a Detailed Mechanism of Hydrogen Oxidation
Notice bibliographique
Résumé
This paper presents an overview of the European Union PARSOAR project, which consists in carrying out a state of the art on hydrogen passive autocatalytic recombiner (PAR) and a handbook guide for implementing these devices in nuclear power plants.This work is performed in the area « Operational Safety of Existing Installations » of the key action « Nuclear Fission » of the fifth Euratom Framework Programme (1998)(1999)(2000)(2001)(2002).Although lots of publications about recombiners have been published for the last ten years, no synthesis has been performing yet.The aim of the PARSOAR project is to make up this lack and to answer needs of all the nuclear technology partners.The project partners are representative of industry, safety organisations, and research institutes, coming from several countries (Belgium, Canada, France, Germany, and Switzerland). The first part of the work (the state of the art on catalytic recombiners) is already performed. It tackles the following items: (1) presentation of the recombination reaction (thermo-chemical principle), (2) presentation of the commercial models, (3) comparison with other hydrogen mitigation systems, (4) presentation of the main experimental activities, (5) presentation of catalytic recombiner qualification, (6) hydrogen ignition risk induced by catalytic recombiner, (7) use of numerical codes to assess recombination rate and to simulate recombiner behaviour, and (8) presentation of national approach about PARs implementation in NPPs.The present study shows that the catalytic recombiner is the most adequate system to mitigate the hydrogen hazard in a nuclear power plant because of its efficiency both in design-basis accident and in beyond-designbasis accident, its passive characteristic, its well known technology (chemical and physical processes), its well defined maintenance, and its low cost compared with other hydrogen mitigation systems. It can be considered that designers have achieved their development: they have been successfully tested their devices in design-basis accident and severe accident conditions in their own facilities or in independent facilities. Few complementary experimental tests about poisoning effect or for simulating design-basis accident conditions in an inerted boiling water reactor, should be performed to complete the qualification.Numerical models on the catalytic recombiner behaviour have been developed, and their integration in global computer codes are in progress.However, these models are insufficient because they can not simulate the probable hydrogen ignition phenomena inside the catalytic recombiner (hot catalyst plates), the degradation or destruction of the device, and the propagation of the combustion wave outside the recombiner.To conclude, a first inventory of the national practices for implementing catalytic recombiners in nuclear power plants makes it possible to outline a common approach from the hydrogen sources quantification to the catalytic recombiner management.The development of this common approach will be the subject of the second part of the project with the writing of a handbook guide.
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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) | 0,001 | 0,000 |
| Bibliométrie | 0,000 | 0,001 |
| Études des sciences et des technologies | 0,000 | 0,000 |
| Communication savante | 0,000 | 0,000 |
| Science ouverte | 0,000 | 0,000 |
| Intégrité de la recherche | 0,000 | 0,000 |
| Charge utile insuffisante (le modèle a refusé de juger) | 0,000 | 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 ».