Bibliografie tematiche / La calandria

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Letteratura scientifica selezionata sul tema "La calandria"

Autore: Grafiati
Pubblicato: 14 dicembre 2024

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Articoli di riviste sul tema "La calandria"

1

David, R. "Heat transfer at the step of a CANDU calandria during a severe accident". Kerntechnik 86, n. 5 (1 ottobre 2021): 338–42. http://dx.doi.org/10.1515/kern-2021-0022.

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Abstract During the in-vessel stage of a severe accident in a CANDU 6 reactor, decay heat from a collapsed core would be rejected through the calandria walls into the surrounding water. At the step in the calandria wall, the subshell and annular plate meet at a right angle pointing into the calandria. The geometry at this joint could concentrate the exiting heat flux, potentially leading to calandria failure. Finite element analysis is used to study the heat transfer near the welded joint. Different weld profiles, boundary conditions, and decay heat characteristics are considered, and the local concentration of exiting heat flux is calculated.
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2

Lumsden, R. H., B. V. Luloff, N. Zahn e N. Simpson. "Development Of NRU Reflector Wall Inspection System". AECL Nuclear Review 2, n. 1 (1 giugno 2013): 17–26. http://dx.doi.org/10.12943/anr.2013.00002.

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In 2009 May, the National Research Universal (NRU) calandria leaked. During the next year, the calandria was inspected with six new Non-Destructive Evaluation (NDE) techniques to determine the extent of the corrosion, repaired, and finally the repair was inspected with four additional new NDE techniques before the reactor was returned to service. The calandria is surrounded by a light-water reflector vessel fabricated from the same material as the calandria vessel. Concerns that the same corrosion mechanism had damaged the reflector vessel led to the development of a system to inspect the full circumference of the reflector wall for corrosion damage. The inspection region could only be accessed through 64 mm diameter ports, was 10 m below the port, and had to be inspected from the corroded surface. The ultrasonic technique was designed to produce a closely spaced wall thickness (WT) grid over an area of approximately 5 m2 on the corroded surface using a very small probe holder. This paper describes the Reflector Wall Inspection (RWI) development project and the system that resulted.
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Shukla, Kaustubh. "Calandria - A Manufacturing Challenge". Advanced Materials Research 794 (settembre 2013): 159–62. http://dx.doi.org/10.4028/www.scientific.net/amr.794.159.

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Accelerating the pace of Nuclear Power Plants construction is critical to the Growth of Indian Economy. It calls for timely and First Time Right manufacturing of various Reactor Equipment. This paper captures the experience of Godrej Precision Engineering Division in successful realization of Calandria, in record time, with First Time Right Quality adhering to very demanding and stringent requirements.
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Guidotti, Angela. "Il doppio gioco della Calandria". MLN 104, n. 1 (gennaio 1989): 98. http://dx.doi.org/10.2307/2904993.

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Bacchiega, Julia. "Calandria, S. (2021). Matar a la madre: Infanticidios, honor y género en la provincia de Buenos Aires (1886-1921). Ciudad Autónoma de Buenos Aires: Biblos; Málaga: Universidad de Málaga. (Ciudadanía e Inclusión)". Trabajos y comunicaciones, n. 56 (22 luglio 2022): e175. http://dx.doi.org/10.24215/23468971e175.

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Park, Sooyong, Kwang-Il Ahn e YongMann Song. "Uncertainty Analysis of the Potential Hazard of MCCI during Severe Accidents for the CANDU6 Plant". Science and Technology of Nuclear Installations 2015 (2015): 1–6. http://dx.doi.org/10.1155/2015/462941.

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This paper illustrates the application of a severe accident analysis computer program to the uncertainty analysis of molten corium-concrete interaction (MCCI) phenomena in cases of severe accidents in CANDU6 type plant. The potential hazard of MCCI is a failure of the reactor building owing to the possibility of a calandria vault floor melt-through even though the containment filtered vent system is operated. Meanwhile, the MCCI still has large uncertainties in several phenomena such as a melt spreading area and the extent of water ingression into a continuous debris layer. The purpose of this study is to evaluate the MCCI in the calandria vault floor via an uncertainty analysis using the ISAAC program for the CANDU6.
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Ells, C. E., C. E. Coleman e C. K. Chow. "Properties of a Candu Calandria Tube". Canadian Metallurgical Quarterly 24, n. 3 (luglio 1985): 215–23. http://dx.doi.org/10.1179/cmq.1985.24.3.215.

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D'Amico, Jack. "Drama and the Court in "La Calandria"". Theatre Journal 43, n. 1 (marzo 1991): 93. http://dx.doi.org/10.2307/3207952.

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Villarreal Albitres, William, e Obidio Rubio Mercedes. "Simulación computacional de flujo de dos-fases de un evaporador Roberts." REVISTA TECNOLOGÍA & DESARROLLO 11, n. 1 (7 marzo 2015): 7–14. http://dx.doi.org/10.18050/td.v11i1.81.

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El presente trabajo de investigación fue llevada a cabo con el objetivo de determinar el comportamiento de los campos de velocidades, temperaturas y presiones del jugo de caña, como fluido de estudio, de un sistema de dos-fase de un evaporador Roberts. Para simular computacionalmente el movimiento de la partícula del fluido en un medio ambiente de dos-fases se usó el código CFX-ANSYS, el cual calcula el campo del flujo por el Método del Volumen Finito. Asimismo, se registraron las condiciones del flujo tanto de jugo como de vapor a la entrada y salida de un evaporador Roberts de 785 m2  de Industrial Pucalá en Chiclayo. Para validar el perfil del campo de temperatura simulados computacionalmente se tomaron datos experimentales del jugo hirviendo, colocando bulbos de temperatura sobre la calandria del evaporador. Resultados obtenidos de la simulación computacional de los campos de velocidad, temperatura y presión del jugo de caña de un evaporador Roberts mostraron que la velocidad del jugo cae dramáticamente en el fondo y calandria del evaporador. Recirculación de jugo abundante ocurre entre la línea de salida de jugo evaporado y el tubo central de recirculado. Así mismo, las temperaturas del fluido que hierve son más altas en la parte media de la altura de la calandria, y su presión decrece uniformemente desde el fondo al cuerpo del evaporador. Los valores de la temperatura del jugo simulados computacionalmente y medidos experimentalmente mostraron estar en buena concordancia, validando al modelo desarrollado.
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Campbell, Susanna K., Alcides L. Morales-Perez, John F. Malloy, Oliver C. Muellerklein, Jin A. Kim, Karan J. Odom e Kevin E. Omland. "Documentation of female song in a newly recognized species, the Puerto Rican Oriole (<em>Icterus portoricensis</em>)". Journal of Caribbean Ornithology 29 (24 ottobre 2016): 28–36. http://dx.doi.org/10.55431/jco.2016.29.28-36.

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Abstract: Evolutionary biologists often assume that male competition for females is the root of the evolution of elaborate coloration and song. However, recent findings show that in the ancestral history of songbirds, it is likely that song occurred in both males and females. Surprisingly, no data exist on female song for many species of birds. We investigated whether the Puerto Rican Oriole (Icterus portoricensis), a tropical songbird, exhibits both male and female song. For this project we marked individuals with sex-specific color bands and confirmed sex using genetic sexing. We repeatedly recorded both male and female orioles singing. Furthermore, female Puerto Rican Oriole song appears to be similar to male song, with no obvious differences in structure. Our study provides further evidence of the ubiquity of female song in tropical songbirds. Finally, our findings provide support that female song is ancestral in the Caribbean oriole clade, and that song dimorphism in temperate breeding species is a result of a loss of female song. Keywords: female song, female vocalizations, Icterus portoricensis, Puerto Rican Oriole, tropical songbirds Resumen: Biólogos evolutivos a menudo asumen que la competencia masculina para las mujeres es la raíz de la evolución de la coloración y canción. Sin embargo, recientes hallazgos muestran que los machos y las hembras ancestrales de todos los pájaros cantores probablemente cantaban; pero existen pocos datos sobre el canto de las hembras de muchas especies de aves. Nosotros investigamos el actuada canta de los hembras y los machos el pájaro, la Calandria Puertorriqueña (Icterus portoricensis). Para este proyecto, marcamos individuos de diferentes sexos con bandas de color específicas y confirmamos el sexo usando métodos genéticos. Adicionalmente; grabamos las canciones de ambos sexos de las Calandrias Puertorriqueñas. Somos los primeros en documentar canción de ambos sexos en esta especie. Por otra parte, la canción de la Calandria Puertorriqueña aparece ser similar a la canción de los machos, sin diferencias evidentes en la estructura de la canción. Nuestro estudio ofrece evidencia adicional de la omnipresencia de la canción femenina en las aves canoras tropicales. Por último, nuestros resultados respaldan la idea de que la canción femenina es ancestral en la clade de las calandrias caribes, y que el dimorfismo en la canción de especies de aves templadas es un resultado de la pérdida de la canción femenina. Palabras clave: aves canoras tropicales, Calandria Puertorriqueña, canto de hembras, Icterus portoricensis, vocalizaciones de hembras Résumé: Les biologistes évolutionnistes supposent souvent que la compétition entre mâles pour les femelles est à l’origine de l'évolution vers une coloration et un chant élaborés. Toutefois, des résultats récents montrent que, dans l'histoire ancestrale des oiseaux chanteurs, il est probable que le chant ait été présent à la fois par chez les mâles et chez les femelles. Étonnamment, aucune donnée n'existe sur le chant des femelles pour de nombreuses espèces d'oiseaux. Nous avons étudié si l'Oriole de Porto Rico (Icterus portoricensis), un oiseau chanteur tropical, présentait à la fois un chant mâle et un chant femelle. Pour ce projet, nous avons marqué les individus avec des bagues de couleurs différentes selon le sexe et confirmé le sexe par des analyses génétiques. Nous avons enregistré à plusieurs reprises des mâles et des femelles en train de chanter. En outre, le chant des femelles d't semble être similaire à celui des mâles, sans différence évidente dans la structure. Notre étude fournit une preuve supplémentaire de l'omniprésence du chant des femelles chez les oiseaux chanteurs tropicaux. Enfin, nos résultats soutiennent l'hypothèse affirmant que le chant des femelles est ancestral dans le clade des orioles des Caraïbes, et que le dimorphisme du chant chez les espèces nichant dans les régions tempérées est le résultat d'une disparition de chant chez les femelles. Mots clés: chant des femelles, Icterus portoricensis, oiseaux chanteurs tropicaux, Oriole de Porto Rico, vocalisation des femelles
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Più fonti

Tesi sul tema "La calandria"

1

Marques, Andre Luis Ferreira 1963. "CANDU pressure/calandria tube emergency water injection system". Thesis, Massachusetts Institute of Technology, 1998. http://hdl.handle.net/1721.1/80049.

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Abstract (sommario):
Thesis (Nucl.E.)--Massachusetts Institute of Technology, Dept. of Nuclear Engineering; and, (S.M.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, February 1999.
Includes bibliographical references (p. 248-256).
by Andre Luis Ferreira Marquis.
S.M.
Nucl.E.
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2

Gerardi, Craig Douglas. "Investigation of pressure-tube and calandria-tube deformation following a single channel blockage event in ACR-700". Thesis, Massachusetts Institute of Technology, 2006. http://hdl.handle.net/1721.1/41264.

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Abstract (sommario):
Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Nuclear Science and Engineering, 2006.
Includes bibliographical references (leaves 113-115).
The ACR-700 is an advanced pressure-tube (PT) reactor being developed by Atomic Energy of Canada Limited (AECL). As in conventional CANDU reactors, the PTs are horizontal. Each PT is surrounded by a calandria tube (CT), and the gap in between is filled with carbon dioxide gas. The space between the CTs is filled with the heavy-water moderator. One postulated accident scenario for ACR-700 is the complete coolant flow blockage of a single PT. The flow is not monitored within each individual PT, thus during the early stages of this accident the reactor remains at full power and full pressure, resulting in rapid coolant boil-off and fuel overheating. Melting of the Zircaloy (Zry) components of the fuel bundle (cladding, end plates and end caps) can occur, with relocation of some molten material to the bottom of the PT. The hot spot caused by the molten Zry/PT interaction may cause PT/CT failure due to localized plastic strains. Failure of the PT/CT results in depressurization of the primary system, which triggers a reactor scram, after which the decay heat is removed via reflooding, thus PT/CT rupture effectively terminates the accident. Clearly, prediction of the time scale and conditions under which PT/CT failure occurs is of great importance for this accident. We analyzed the following key phenomena occurring after the blockage: (a) Coolant boil-off (b) Cladding heat-up and melting (c) Dripping of molten Zircaloy (Zry) from the fuel pin (d) Thermal interaction between the molten Zry and the PT (e) Localized bulging of the PT (f) Interaction of the bulged PT with the CT Simple one-dimensional models were adequate to describe (a), (b) and (c), while the three-dimensional nature of (d), (e) and (f) required the use of more sophisticated models including a finite-element description of the thermal transients within the PT and the CT, implemented with the code COSMOSM.
(cont.) The main findings of the study are as follows: (1) Most coolant boils off within 3 s of accident initiation. (2) Depending on the magnitude of radiation heat transfer between adjacent fuel pins, the cladding of the hot fuel pin in the blocked PT reaches the melting point of Zry in 7 to 10 s after accident initiation. (3) Inception of melting of the UO2 fuel pellets is not expected for at least another 7 s after 2Zry melting. (4) Several effects could theoretically prevent molten Zry dripping from the fuel pins, including Zry/UO2 interaction and Zry oxidation. However, it was concluded that because of the very high heat-up rate typical of the flow blockage accident sequence, holdup of molten Zry would not occur. Experimental verification of this conclusion is recommended. (5) Once the molten Zry relocates to the bottom of the PT, a hot spot is created that causes the PT to bulge out radially under the effect of the reactor pressure. The PT may come in contact with the CT, which heats up, bulges and eventually fails.
(cont.) The inception and speed of the PT/CT bulging and ultimately the likelihood of failure depend strongly on the postulated mass of molten Zry in contact with the PT, and on the value of the thermal resistance at the Zry/PT interface. It was found that a Zry mass =/< 10 g will not cause PT/CT failure regardless of the contact resistance effect. On the other hand, a mass of 100 g would be sufficient to cause PT/CT failure even in the presence of a thick 0.2 mm oxide layer at the interface. The characteristic time scales for this 100-g case are as follows: PT bulging starts within 3 s of Zry/PT contact - PT makes contact with the CT in another 2 s - CT bulging starts in less than 1 s - CT failure occurs within another 5 s. Thus, the duration of the PT/CT deformation transient is 11 s, which gives a total duration of the accident (from PT blockage to PT/CT failure) of 18 to 21 s.
by Craig Douglas Gerardi.
S.M.
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3

Cataldi, Gemma. "Représentatiοns et traductiοns de La Calandra du cardinal Bibbiena : prοblèmes de réceptiοn en France d'une pièce au cοmique licencieux". Electronic Thesis or Diss., Normandie, 2024. http://www.theses.fr/2024NORMC012.

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Cette thèse se propose d’étudier la réception scénique et traductive de La Calandra du cardinal Bibbiena, qui s’amorce en France à partir du XVIe siècle. L’objectif est, dans un premier temps, de comprendre quel type d’accueil cette pièce a reçu en France et, dans un deuxième temps, de saisir la manière dont le comique licencieux de cette pièce, repris du Décaméron, a été transposé dans les traductions françaises au XIXe siècle. A cette fin, après avoir reparcouru d’abord sa première représentation à Urbino en 1513, puis celle de Lyon en 1548, nous proposons une analyse des deux traductions réalisées l’une par Théodore Muret en 1835, l’autre par Alcide Bonneau en 1887. À travers ce parcours qui traverse plusieurs siècles, nous souhaitons montrer comment s’articulent l’accueil dramaturgique et l’accueil traductif de cette pièce, lesquels sont la conséquence de réalités très riches et variées
The objective of this thesis is the study of the reception of the staging and translation of Cardinal Bibbiena’s La Calandra in France from the 16th to 19th centuries. It firstly explores how this play was received in France, then seeks to understand how its licentious comedy, taken from the living language of the stories of Decameron, was conveyed in the 19th century French translations. Through examination of the work’s first performance in Urbino in 1513, then Lione’s 1548 version, it subsequently seeks to demonstrate how the comedy of the dialogue was communicated in the two French translations: the first by Theodore Muret in 1835 and the second by Alcide Bonneau in 1887. The process of the reception of La Calandra in the centuries examined, which resulted from rich and varied phenomena, is evidenced in detail
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4

Silva, Paulo Jorge Ferreira Antunes da. "Aplicação de controlo distribuido numa calandra de accionamento hidráulico". Master's thesis, Universidade de Aveiro, 2007. http://hdl.handle.net/10773/2175.

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Mestrado em Engenharia Electrónica e Telecomunicações
A calandra hidráulica é uma máquina industrial concebida para con- formação de chapa. Nos dias de hoje é uma máquina muito comum na indústria metalomecânica, para fabrico de caldeiras e torres eólicas. Neste trabalho foi desenvolvido um sistema de comando numérico com- putorizado (CNC) com objectivo de modernizar o sistema de controlo da calandra de accionamento hidráulico. Para implementação da solução final foi necessário definir uma base de hardware e uma base de software para controlo do processo. No sis- tema desenvolvido foi implementado uma rede suportada no protocolo RS485 de autómatos programáveis (denominados de PLCs, do inglês "Programmable Logic Controllers") baseada numa arquitectura mestre escravos (master and slaves) que estão directamente ligados aos actu- adores e sensores usados na estrutura, no topo da pirâmide de controlo encontra-se um computador industrial que têm com funções principais o supervisionamento do processo de controlo, calculo numérico e in- terface com o utilizador. O sistema de comando desenvolvido têm dois modos de trabalho, um modo automático e outro o modo manual. No modo manual a máquina ¶e accionada directamente pelos botões e joystiks do painel de comando, sendo sempre possível ao operário basear-se no sistema de sete eixos de controlo implementados na máquina. No modo automático a máquina é autónoma e executa um conjunto de tarefas definidas pelo programa de dados. A aplicação de software principal desenvolvida para controlo da máquina designada de CNC_CE é uma interface gráfica composta por cinco menus principais: Dados, Simulação, Ficheiro, Teach In e Automático.
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Hartley, Ian Russell. "Polygyny, parentage and parental investment in the corn bunting, Miliaria calandra". Thesis, University of Leicester, 1991. http://hdl.handle.net/2381/34102.

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1) This study investigated the costs and benefits of a polygynous mating system, and its effects on reproductive success and parental care in male and female com buntings (Miliaria calandra), on North Uist, Outer Hebrides. In 1989 and 1990, 41.2% of males were monogamously paired, 33.3% polygynous and 23.5% unpaired; the sex ratio was 1:1. Polygynous males usually paired with two females; occasionally three. The distribution of females among males was not significantly different from a binomial distribution. 2) DNA fingerprinting showed that there were only two possible cases of extra-pair paternity (EPP) due to extra-pair copulation (EPC) (4.5% of 44 offspring; 6.7% of broods), both from the same brood. There were no cases of intra-specific brood parasitism (IBP) (0% of 50 offspring; 0% of 16 broods). EPP was probably rare because of mate guarding by the male, asynchrony between broods for polygynous males and limited opportunities for EPC. Polygynous males fledged more offspring from their territories than did monogamous males because they paired with more females; unpaired males fledged no offspring. 3) Unlike most other polygynous birds, primary and secondary females of polygynous male com buntings had similar reproductive success and both had greater reproductive success than monogamous females. Monogamous females had lower reproductive success because their chicks starved more often. Although monogamous females provisioned nestlings at a similar rate to females of polygynous males, monogamous females delivered smaller food loads, which may have led to the reduced success of those nests. 4) Males rarely fed nestlings before they were four days old. Males provided less food for nestlings than did females at all chick ages and, on average, provided a maximum of only 22.0% of all feeds. Unusually for a polygynous species, males provisioned nestlings of monogamous, primary and secondary females with similar sized food loads and at similar rates. 5) Broods belonging to primary and secondary females were apparently equally valuable to their males because EPP was low in this population and brood sizes were similar between nest classes. Males may have been able to feed both nests because they were temporally separate, although at least one male was able to feed overlapping nests simultaneously. Males provisioned proportionately less than females at early stages of the nestling period, possibly because of sex differences in other available reproductive opportunities. Females had no better available option than to provide parental care to the current brood, whereas males could potentially increase their fitness better by defending a territory in which females could breed. 6) Males appeared to defend areas in which females chose to nest rather than to forage. Females often foraged outside male territories. The territories of unpaired, monogamous and polygynous males did not differ significantly in habitat composition. 7) Female corn buntings neither suffered costs to polygyny, nor did they compete for resources, such as male parental care, nest sites or food. Nests were under-dispersed in space, because of habitat aggregation, and were randomly dispersed in time within territories. Primary and secondary females of polygynous males did not choose territories in the same order, and the first settling females of polygynous males did not settle significantly earlier than monogamous females; this suggests that males were chosen randomly, rather than by the quality of their resources. I suggest that low variance of male territory quality facilitated random female choice of males. A no-cost, no-benefit model, with females choosing males randomly is suggested as the best explanation for the maintenance of polygyny in the com bunting.
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Kalioudjoglou, Loïck. "Modélisation thermohydraulique de générateur de vapeur : développement de méthodes de couplage 1D/CFD-Milieux équivalents". Thesis, Nantes, 2019. http://www.theses.fr/2019NANT4005.

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Le Générateur de Vapeur est un des composants majeurs des unités de production d’électricité permettant la propulsion des navires de Naval Group. Les phénomènes physiques mis en jeux dans ces échangeurs sont complexes à simuler en raison de la variété des topologies d’écoulement et des régimes de transfert thermique présents. Cette thèse s’emploie à développer un programme adapté à la modélisation des différents GV de Naval Group. La méthodologie mise en place propose un couplage entre un code 1D et un calcul CFD reposant sur l’approche des milieux équivalents. La modélisation des écoulements monophasiques au sein des échangeurs est abordée dans un premier temps avant de présenter la modélisation des écoulements diphasiques. L’intérêt de la méthode est mis en évidence par sa validation sur des appareils testés expérimentalement et en la confrontant avec d’autres approches numériques existantes. Les travaux proposent des solutions afin de modéliser des GV en serpentin et permettent d’envisager la simulation de géométries plus complexes. Le calcul des efforts hydrauliques et des échanges d’énergies entre le liquide, la vapeur et la paroi est détaillée. Par sa structure, le modèle tend à répondre à l’ensemble des configurations de GV envisageables. Différentes manières d’alimenter le modèle sont proposées en remplacement des corrélations empiriques existantes et permettent d’envisager de nouvelles solutions plus adaptées
The steam generator is one of the major components of the power generation unit for the propulsion of Naval Group ships. The physical phenomena involved in these heat exchangers are complex to simulate because of the variety of flow patterns and heat transfer regimes. This thesis aims to develop a program adapted to the modeling of Naval Group’s steam generators. The developed methodology proposes a coupling between a 1D-code and CFD calculation based on the porous media approach. The modeling of monophasic flows within heat exchangers is first discussed before presenting that of two-phase flows. The method’s interest is highlighted by its validation on experimental test cases and by comparing it to other existing numerical approaches. The work brings solutions to model helically coiled steam generator and allow to consider the simulation of more complex geometries. The calculation of the hydraulic forces and energy exchanges between the liquid, the vapor and the tube’s wall is detailed. By its structure, the model tends to be able to represent all possible configurations of steam generators. Different ways of feeding this model are proposed to replace the existing empirical laws and make it possible to envisage new and more adapted solutions
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Shepherd, Michael. "Some aspects of the breeding biology of the corn bunting Miliaria calandra". Thesis, University of Nottingham, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.315092.

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8

Simard, Rémy. "Chauffage par induction de calandres pour machines à papier". Thèse, Université du Québec à Trois-Rivières, 1988. http://depot-e.uqtr.ca/5789/1/000572318.pdf.

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9

Poll, Marcia Trojan. "UMA METODOLOGIA PARA AUTOMAÇÃO DO PROCESSO DE CONFORMAÇÃO POR CALANDRAS". Universidade Federal de Santa Maria, 2008. http://repositorio.ufsm.br/handle/1/8084.

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The present work presents the development of a methodology for transforming conventional roll benders of industrial tubes and plates into an equipment with a programmable automatic system for bending parts with fixed and/or changeable rays. A conceptual mechanical project (without details) is presented and computational resources were implemented for recognition of drawings defined in a system of computer aided design with the objective of automatically generating the task-program, being capable of making the conformation of the projected part. This way, the requirement of programmable operation is satisfied and the equipment will work according to principles of numerical command machines. Besides that, the proposal considers the necessary adjustment in the machine operational parameters because of the material springback through the image processing extracted from a photo of the conformed part. Thus, the ray executed in the part is recognized and makes it possible to compare it with the projected ray. According to this study, the system was implemented as an applicative of CAD system for the technique viability analysis and was concluded to be viable, since the programming methodology was implemented successfully and the results were satisfactory, the user can draw a part in a CAD system and a program CNC is generated for the execution of the part. Other related and important aspects for the development of the methodology are discussed, such as: CNC programming, image processing, CAD programming systems and the process of mechanical forming to bend tubes or plates.
O presente trabalho apresenta o desenvolvimento de uma metodologia para transformar calandras de tubos e chapas convencionais em equipamentos com sistema automático programável para execução de peças com raios fixos e/ou variáveis. É apresentado um projeto mecânico conceitual (sem detalhamento) e são implementados recursos computacionais para reconhecimento de desenhos definidos em sistema de projeto auxiliado por computador com o objetivo de gerar automaticamente o programa-tarefa capaz de executar a conformação da peça projetada. Desta maneira, o requisito de operação programável é satisfeito fazendo com que o equipamento trabalhe segundo os princípios de máquinas CNC. A proposta considera ainda o ajuste necessário nos parâmetros de operação da máquina devido a recuperação elástica do material através do processamento de uma imagem extraída de uma foto da peça conformada. Desta forma, o raio executado na peça é reconhecido e torna-se possível compará-lo com o raio projetado. Conforme demonstra o estudo, para análise da viabilidade técnica da proposta, o sistema foi implementado na forma de aplicativo de sistema CAD e conclui-se ser viável, já que a metodologia de programação foi implementada com sucesso e gerou resultados satisfatórios, onde o usuário desenha uma peça em sistema CAD e um programa CNC para a execução da peça é gerado. Outros aspectos relativos e importantes para o desenvolvimento da metodologia são discutidos, tais como: programação CNC, processamento de imagens, programação em sistemas CAD e processo de conformação mecânica para curvar tubos ou chapas.
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Brickle, Nicholas W. "The effect of agricultural intensification on the decline of the Corn Bunting, Miliaria calandra". Thesis, University of Sussex, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.287184.

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Libri sul tema "La calandria"

1

Rafael, Delgado. La Calandria. Xalapa, Veracruz, México: Universidad Veracruzana, 1995.

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2

Escanaverino, Ursula Céspedes de. El canto de La Calandria. Bayamo, Granma, Cuba: Ediciones Bayamo, 2013.

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3

Barrios, Luis Emilio Morales. ¡Por culpa de la Calandria! Guatemala, Guatemala: Editorial Universitaria, Universidad de San Carlos de Guatemala, 2015.

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4

Sandoval, Adriana. A cien años de "La calandria". Xalapa, Ver., México: Universidad Veracruzana, 1999.

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5

Maeso, María Angeles. Perro (o los bocados de la calandria). Madrid: Huerga y Fierro Editores, 2004.

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6

E, Coleman C., e Chalk River Laboratories, a cura di. Improving the calandria tubes for CANDU reactors. Chalk River, Ont: Chalk River Laboratories, 1997.

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7

Maeso, Ángeles. Perro (o los bocados de la calandria). Madrid: Huerga y Fierro Editores, 2004.

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8

Fanelli, Carlo. La Calandria: Tematiche e simbologia : [il panorama teatrale del Cinquecento e La Calandria di Bernardo Dovizi da Bibbiena]. Firenze: Atheneum, 1997.

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9

Moyer, R. G. Reduction of pressure-tube/calandria-tube contact conductance. Pinawa, Man: Whiteshell Laboratories, 1992.

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10

Fong, Randy W. L., 1954- e Chalk River Laboratories, a cura di. Tensile properties of irradiated calandria tubes at low to high rates of strain. [Chalk River, Ont: Chalk River Laboratories], 1997.

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Capitoli di libri sul tema "La calandria"

1

Hecker, Kristine. "Bibbiena, Bernardo Dovizi da: La Calandria". In Kindlers Literatur Lexikon (KLL), 1–2. Stuttgart: J.B. Metzler, 2020. http://dx.doi.org/10.1007/978-3-476-05728-0_2756-1.

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2

Ravi, S. D., N. K. S. Rajan e P. S. Kulkarni. "Computational and Experimental Studies of Fluid Flow and Heat Transfer in a Calandria Based Reactor". In Computational Fluid Dynamics 2008, 233–38. Berlin, Heidelberg: Springer Berlin Heidelberg, 2009. http://dx.doi.org/10.1007/978-3-642-01273-0_27.

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3

Reddy, Mula Venkata Ramana, S. D. Ravi, P. S. Kulkarni e N. K. S. Rajan. "Numerical Model for the Analysis of the Thermal-Hydraulic Behaviors in the Calandria Based Reactor". In Computational Fluid Dynamics 2010, 669–76. Berlin, Heidelberg: Springer Berlin Heidelberg, 2011. http://dx.doi.org/10.1007/978-3-642-17884-9_85.

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4

Kumar, Nirmal, Varun Mishra, D. Faisal, R. K. Chaudhary, V. Chaudhry e S. M. Ingole. "Structural Integrity Assessment of Calandria End-Shield Assembly for In-Vessel Corium Retention Under Severe Accident Condition". In Lecture Notes in Mechanical Engineering, 415–33. Singapore: Springer Singapore, 2022. http://dx.doi.org/10.1007/978-981-16-8724-2_38.

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5

Giovanardi, Claudio. "Sulla lingua della Calandra di Bernardo Dovizi da Bibbiena". In «La sua chiarezza séguita l’ardore», 311–35. Firenze: Società Editrice Fiorentina, 2023. http://dx.doi.org/10.35948/dilef/978-88-6032-711-6.23.

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Questo contributo analizza la lingua della Cassandra, commedia di Bernardo Dovizi da Bibbiena rappresentata per la prima volta nel 1513. Tale commedia è stata fonte di ispirazione per molte altre commedie cinquecentesche. In questo lavoro si analizzano in particolare la sintassi, il lessico e i modi in cui l’autore costruisce il dialogo fra i personaggi.
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6

Garcin, J., M. Idriss e F. Lauro. "Etude De La Distribution De Melange Liquide-Vapeur Cote Tube Dans Les Echangeurs A Tubes Et Calandre". In Energy Efficiency in Process Technology, 653–66. Dordrecht: Springer Netherlands, 1993. http://dx.doi.org/10.1007/978-94-011-1454-7_58.

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7

Bibbiena, Bernardo Dovizi da. "The Calandria / La calandria". In Renaissance Comedy. Toronto: University of Toronto Press, 2009. http://dx.doi.org/10.3138/9781442697386-002.

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8

"*CALANDRA, *CALANDRIA (latvulg.) oiseau, espèce d’alouette". In Les animaux 2, 327–32. De Gruyter, 2020. http://dx.doi.org/10.1515/9783110637977-040.

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9

Franco, Rafael Olea. "LA CALANDRIA:". In Varia lingüística y literaria, 225–48. El Colegio de México, 1997. http://dx.doi.org/10.2307/j.ctv47w565.16.

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10

"calandria, n." In Oxford English Dictionary. 3a ed. Oxford University Press, 2023. http://dx.doi.org/10.1093/oed/7288924874.

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Atti di convegni sul tema "La calandria"

1

Liu, Cheng, Eric Tulk, Douglas Scarth e Larry Micuda. "Fitness-for-Service Assessment of Calandria Tube to Liquid Injection Shutdown System Nozzle Contact in a CANDU Reactor". In ASME 2016 Pressure Vessels and Piping Conference. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/pvp2016-63989.

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In CANDU1 reactors, calandria tubes are used to separate the fuel channels from the moderator. The Liquid Injection Shutdown System (LISS) nozzles, which contain holes for discharging neutron-absorbing liquid into the moderator, are arranged perpendicularly in the gap between adjacent rows of calandria tubes. Both calandria tubes and LISS nozzles sag during service due to creep, with the more heavily loaded calandria tubes sagging relatively more. When contact between a calandria tube and a LISS nozzle has been detected by in-service inspection, or is predicted to occur, a fitness-for-service assessment is permitted by CSA Standard N285.4 to demonstrate acceptability of continued operation until the end of the next periodic inspection interval, provided that the fitness-for-service assessment is acceptable to the Regulatory Authority. A fitness-for-service assessment has been recently performed for a calandria tube and a LISS nozzle that were predicted to contact at a future time. The assessment has demonstrated that for an evaluation period of three years after the predicted contact time, the structural integrity of the calandria tube and the LISS nozzle is maintained, both components will continue to function in accordance with their design requirements, and their contact will not result in contact between the calandria tube and a pressure tube.
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2

Metzger, D., E. Araujo e D. Brown. "Anatomy of the Calandria Tube Rolled Joint". In ASME 2007 Pressure Vessels and Piping Conference. ASMEDC, 2007. http://dx.doi.org/10.1115/pvp2007-26744.

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In CANDU™ (Canadian Deuterium Uranium) Reactors, the joint between the Calandria tubes to the Calandria tubesheets is achieved by roller expanded joints. This paper models a detailed account of the Calandria tube joint fabrication and deformation. Numerical simulation illustrates the mechanisms of bending and compression that cause the plastic deformation in the joint. Results show that the insert deformation must pinch the Calandria tube both axially and radially at groove edges to create leak tightness. Predicted rolling forces have been used to quantify the elastic deformation in the rollers and mandrel, and the final tool setting is seen to account for this springback as well as springback in the joint components.
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3

Negut, Gheorghe, Ilie Prisecaru, Alexandru Catana e Daniel Dupleac. "CANDU 600 Severe Accident Assessment". In 16th International Conference on Nuclear Engineering. ASMEDC, 2008. http://dx.doi.org/10.1115/icone16-48492.

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Romania is now a UE member since January first 2007. New challenges are for our country that includes, also, their nuclear power reactors. Romania operates since 1996 a CANDU nuclear power reactor and soon will start up a second unit. In EU are operated PWR reactors, so, ours have to meet UE standards. Safety analysis guidelines require to model severe accidents for these types of reactors. Starting from previous studies a CANDU degraded core thermalhydraulic model was developed. The initiating event is a LOCA with simultaneous loss of moderator cooling and the loss of emergency core cooling system (ECCS). This type of accident is likely to modify the reactor geometry and will lead to a severe accident development. When the coolant temperatures inside a pressure tube reaches 1000 C, a contact between pressure tube and calandria tube occurs and the decay heat is transferred to the moderator. Due to the lack of cooling, the moderator eventually begins to boil and is expelled, through the calandria vessel relief ducts, into the containment. Therefore the calandria tubes (fuel channels) uncover, then disintegrate and fall down to the calandria vessel bottom. All the quantity of calandria moderator is vaporized and expelled, the debris will heat up and eventually boil. The heat accumulated in the molten debris will be transferred through the calandria vessel wall to the shield tank water, which surrounds the calandria vessel. The thermal hydraulics phenomena described above are modeled, analyzed and compared with the existing data.
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4

Leitch, Brian W. "Deformation Behaviour of a Transversely Loaded Garter Spring". In ASME/JSME 2004 Pressure Vessels and Piping Conference. ASMEDC, 2004. http://dx.doi.org/10.1115/pvp2004-2746.

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The CANDU power generation system is based on a natural uranium fuelled reactor with a heavy water moderator. A unique feature of the CANDU reactor is the horizontal fuel channel that allows on-line re-fuelling and fuel management. Pressure tubes containing the fuel bundles and pressurized heavy water coolant are the in-core component of the fuel channel assemblies. Calandria tubes span the length of the reactor core and provide passageways for the pressure tubes through the reactor core. The calandria and pressure tubes are each approximately 6 meters long. The calandria tube separates the heavy water moderator (∼80°C) from the pressure tube (∼300°C). Both tubes are subjected to gravity loads but the pressure tube carries the additional load of the fuel bundles as well as experiencing high temperature and irradiation induced material effects. The pressure tube deflects under the combined loading and areas of the pressure tube could come into contact with the calandria tube. This contact would limit the operating efficiency and lifetime of the fuel channel. To maintain a gap between the pressure and calandria tubes, helical springs manufactured from rectangular cross-section wire are placed over the pressure tube. These helical springs are known as garter springs and four such springs are spaced along the pressure tube. Initially, there is no contact between the springs and the calandria tube, but as gravity forces and creep effects begin to act, the pressure tube sags and garter spring/calandria tube contact occurs. As the pressure tube continues to deform, a portion of the pressure tube weight, fuel and coolant is transmitted through the garter spring onto the calandria tube. The calandria tube, in turn, begins to deflect under the applied stresses. This creep deformation of the fuel channel takes place over many thousands of operating hours. Eventually, creep induces a permanent vertical deformation (sag) in the fuel channel. The sag of a fuel channel is an important factor in the operation of the structure and many methods are used to determine the general response of the pressure tube/calandria tube/garter spring system. These methods assume the garter spring is a rigid component. This paper specifically examines the garter spring behaviour with respect to the non-linear material and contact response between the pressure tube/garter spring/calandria tube components. A three dimensional (3-D) finite element solid model of the garter spring is used to determine the non-linear response of the helical garter spring to the transverse forces applied from 3-D shell finite element models of the pressure and calandria tubes. Comparison with experimental, crushing tests on garter springs illustrate the analytical model is well behaved. Applying the operating load to the 3-D model shows that the garter spring’s transverse deformation is small and that assuming the garter spring is a rigid component is valid.
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Vaidya, Abhijeet Mohan, Naresh Kumar Maheshwari, Pallippattu Krishnan Vijayan, Dilip Saha e Ratan Kumar Sinha. "Effect of Inlet Configuration on Moderator Velocity and Temperature Distribution Inside the Calandria of a Heavy Water Reactor". In 16th International Conference on Nuclear Engineering. ASMEDC, 2008. http://dx.doi.org/10.1115/icone16-48347.

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Computational study of the moderator flow in calandria vessel of a heavy water reactor is carried out for three different inlet nozzle configurations. For the computations, PHOENICS CFD code is used. The flow and temperature distribution for all the configurations are determined. The impact of moderator inlet jets on adjacent calandria tubes is studied. Based on these studies, it is found that the inlet nozzles can be designed in such a way that it can keep the impact velocity on calandria tubes within limit while keeping maximum moderator temperature well below its boiling limit.
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6

Banwatt, A. S., e R. G. Sauve´. "Calandria Tube to Tubesheet Roller-Expanded Joint Qualification". In ASME 2006 Pressure Vessels and Piping/ICPVT-11 Conference. ASMEDC, 2006. http://dx.doi.org/10.1115/pvp2006-icpvt-11-93645.

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The complex calandria tube to calandria tubesheet roller-expanded joint in CANDU nuclear reactors is usually qualified by test. In this paper, a state-of-the-art numerical simulation is undertaken in order to improve the understanding of the behaviour of the joint to support design modifications and provide assurance that the test rig envelopes behaviour of the in-situ reactor assembly. Parameters such as hoop stress, and plastic deformation of the assembly are predicted. The analysis results are also compared with the available test data and in-situ experimental data. The analysis results show that the test performed to qualify the joint using a small plate and single joint is representative of the in-situ reactor configuration.
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7

Chatterjee, S., e K. Madhusoodanan. "Finite Element Simulation of Calandria Tube for the Design Optimisation of Calandria Tube-to-Tube Sheet Rolled Joint Detachment Tool". In 5th International Congress on Computational Mechanics and Simulation. Singapore: Research Publishing Services, 2014. http://dx.doi.org/10.3850/978-981-09-1139-3_056.

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8

Manu, Corneliu, Suresh Babu, Saleh Baset e Julian Millard. "Initial Development of a Numerical Methodology to Simulate the Roller Expansion Forming Process". In ASME 2005 Pressure Vessels and Piping Conference. ASMEDC, 2005. http://dx.doi.org/10.1115/pvp2005-71011.

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A distinguishing design feature of CANDU® nuclear reactors is the use of horizontal fuel channels housed in a horizontal vessel called a calandria, which is made of stainless steel 304L. Each channel consists of a Zr-2.5%Nb alloy pressure tube and an externally concentric Zr-2 calandria tube. The calandria tubes are joined to the end plates (tubesheets) of the calandria vessel by joints formed by roller expansion. The bores in the tubesheets are grooved. Roller expanded joints provide a cost effective means of joining dissimilar materials, require minimal space and no maintenance. The quality of these roller expanded joints is important from a sealing, strength and stress corrosion point of view. The roller expansion process consists of expanding the calandria tubes to deform them plastically against the bores and into the grooves of the tubesheets. Therefore, understanding the effect of the number, geometry and the pitch of the grooves on the quality of a roller expanded joint is very important. The objective of this paper is to present a numerical methodology developed to optimize the design of such roller expanded joints with particular interest on the effect of the grooves. This numerical analysis was used as an adjunct to assist the related design test program. The numerical techniques required to simulate the behaviour of calandria tubes during roller expansion involve the evaluation of large deformations, large plastic strains and stresses and rapidly changing contacts. The LS-DYNA general-purpose finite element computer code was selected for such simulations. A three-dimensional finite element model was developed so that the sweeping of the rollers while under outward radial movement is properly modelled and the plastic deformation and flow of the calandria tube material into the tubesheet grooves are accurately simulated. The paper discusses this numerical methodology, presents results of general interest, and makes comparisons with associated experimental data and other available results.
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Kim, Hyoung Tae, Han Seo, Sunghyuk Im, Bo Wook Rhee e Jae Eun Cha. "Experimental Study of Moderator Circulation in CANDU6 Calandria Tank". In 2014 22nd International Conference on Nuclear Engineering. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/icone22-31140.

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As a CANDU6 reactor has a high pressure primary cooling system and an independently cooled moderator system, the moderator in the calandria would act as a supplementary heat sink during a loss of coolant accident (LOCA) if the primary cooling and emergency coolant injection systems fail to remove the decay heat from the fuel. For the safety concern it is required to predict the 3-dimensional velocity and temperature distribution of moderator fluid to confirm the effectiveness of moderator heat sink. Korea Atomic Energy Research Institute (KAERI) is carrying out a scaled-down moderator test program to simulate the CANDU6 moderator circulation phenomena during steady state operation and accident conditions. This research program includes the construction of the Moderator Circulation Test (MCT) facility, production of the validation data for self-reliant CFD tools, and development of optical measurement system using the Particle Image Velocimetry (PIV). In the present work the PIV technique is used to measure the velocity distributions in the scaled moderator tank of MCT under iso-thermal test conditions. The preliminary PIV measurement data are obtained and compared with CFX code predictions.
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Hobbs, Daniel M., Allan M. Freeburn, Richard C. Scrannage, Farshad Sani e Glenn D. Harvel. "Heat Transfer Assessment of Calandria Tube Enhancement Design Options". In 17th International Conference on Nuclear Engineering. ASMEDC, 2009. http://dx.doi.org/10.1115/icone17-75601.

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The moderator in the Calandria of a CANada Deuterium Uranium (CANDU) reactor serves as a backup heat sink in a Loss of Coolant Accident (LOCA) combined with a Loss of Emergency Coolant Injection (LOECI) accident scenario. This requires that the heat from the fuel be transferred through the ballooned/sagged Pressure Tube and the contacted Calandria Tube (CT) to the moderator. Increasing the heat transfer to the moderator will enhance the safety of the reactor by increasing the margin to Calandria Tube Rupture and ensuring the fuel is cooled. Conceptual designs were assessed to determine their potential for increasing heat transfer to the moderator in accident scenarios. Three different design options for a CT have been investigated using numerical simulation techniques. The CT design options include fins or ribs of different sizes and combinations. The fins and ribs provide improved heat transfer. Analyses results have shown that the design options yield an increased heat transfer with a minimal impact on moderator flow. The analysis has determined that the ribbed design option is superior in terms of heat transfer enhancement.
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