Measuring Deformations in a CANDU 6 Concrete Containment Structure
Notice bibliographique
Résumé
The CANDU TM 6 reactor system is contained within a post-tensioned concrete containment structure.The New Brunswick Power (NBP) owned, Point Lepreau CANDU TM 6 Generating Station (PLGS) located in New Brunswick, Canada, has been in service since 1983.Investigations are being undertaken to evaluate the significance of any age-related degradation.Particularly, a survey is being conducted to assess the expected long term performance of the structure.For part of this survey, in-situ deformations that occur during normal reactor operation and a leak-rate test, for which the structure is internally pressurized, are being measured.During the early life of the structure, deformations were measured using both embedded and surface mounted gauges on the concrete surfaces.The record shows that neither of these strategies provided results which can be used to evaluate the current stress conditions.A reason for this may be related to the type of instrumentation used.Subsequently, various types of commercially available instruments have been appraised for application at PLGS.Laboratory and in-situ tests on mechanical, vibrating wire and fibre-optic deformation measuring devices confirm that the accuracy of the measurements can be expected to vary significantly between instrument types.In addition, for each instrument type, the instrument stiffness, the temperature and the manner in which the instrument is installed all strongly influence output.Recently, three gauge types were retrofitted to the outside surfaces of the PLGS containment structure to provide a further assessment of the usefulness of the instrumentation and, ultimately, the condition of the structure.Taking the determining factors of instrument type and environment into account, measurements were made during and following a leak-rate test.These tests have shown that all of the instrument types can be used to assess the condition of the structure.It is shown that concrete containment structure is required to endure distortional stresses due to environmental conditions.It is concluded that monitoring of deformations occurring in concrete containment structures during the leak-rate pressure tests as well as continuously over the period of their operating life is an essential element in a structural ageing management program. BACKGROUNDIn the mid 1990's, Atomic Energy of Canada Limited (AECL) and New Brunswick Power (NBP) initiated a series of investigations to determine the neeA for a Plant Life Management Program (PLiM) at Point Lepreau Generating Station.Recently, a program was designed to provide the basis for a statement of "fitness for service" for the structures partially through measurements on the concrete containment.The plan included activities designed to provide details for an ageing management program (AMP) and an assessment of the condition of the structures.The physical installation of instrumentation on the concrete containment structure was required for both of these purposes.Part of the proposed in-situ work was recently completed.This paper presents a summary of the ageing management program, the physical condition survey and the monitoring scheme designed to evaluate the effects of age-related change, if any, for the containment structure.The monitoring program carried out during and following a leak rate pressure test is briefly described.For the latter, instruments were installed on the exterior surfaces of the containment structure at PLGS, and measurements were taken during a leak-rate (pressure) test.A brief summary of some of the test results is presented.
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 machine sur la base complète
Imitation des enseignantsNi prévalence calibrée, ni vérité terrain. Validation humaine à venir. Le volet Gemma est une étiquette directe du modèle pour chaque travail de la base, lue sur la notice réduite au titre. Le volet Codex est un classifieur appris des 10 348 étiquettes directes de Codex et calibré sur les taux pondérés de l'échantillon; les champs sans appui suffisant ne portent aucun appel Codex. Le mode candidate est l'union des deux volets; le consensus est leur intersection. Ces sorties portent le statut machine_predicted_unvalidated et ne sont pas des étiquettes humaines.
Scores du classifieur distillé par catégorie (deux têtes)
| Catégorie | Codex | Gemma |
|---|---|---|
| Métarecherche | 0,001 | 0,001 |
| Méta-épidémiologie (sens strict) | 0,000 | 0,000 |
| Méta-épidémiologie (sens large) | 0,000 | 0,000 |
| Bibliométrie | 0,001 | 0,001 |
| Études des sciences et des technologies | 0,000 | 0,000 |
| Communication savante | 0,000 | 0,000 |
| Science ouverte | 0,001 | 0,000 |
| Intégrité de la recherche | 0,001 | 0,000 |
| Charge utile insuffisante (le modèle a refusé de juger) | 0,001 | 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 source (Gemma direct ou Codex distillé), 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 ».