TERMIUM Plus^®

Record 1,  Textual support,  English

Record number: 1, Textual support number: 1 CONT

… we describe a new spectral nodal method for solving discrete ordinates(S_N) neutron transport problems with anisotropic scattering for arbitrary order N of angular quadrature. The key to our new spectral nodal method is a consistent derivation of nonstandard auxiliary equations that relate angular neutron fluxes only in the upwind directions. These nonstandard equations are angularly coupled extensions of very basic auxiliary equations proposed by Edward W. Larsen in his extended diamond scheme of solving S₂ problems in the presence of scattering and free from spatial truncation error.  1, record 1, English, - diamond%20scheme

Record 1,  Textual support,  French

Record number: 1, Textual support number: 1 CONT

Si on fait l’hypothèse que le flux est linéaire à la fois en fonction de l’espace et de l’angle sur chaque intervalle de la discrétisation, on peut mettre en œuvre une technique de résolution numérique basée sur le schéma diamant.  1, record 1, French, - sch%C3%A9ma%20diamant

Record 1,  Textual support,  Spanish

Record 2,  Textual support,  English

Record number: 2, Textual support number: 1 DEF

In transport theory, a mathematical technique which allows integral parameters of a structure(for example, reflection coefficients) to be obtained without giving a detailed description of the neutron flux density in the structure.  2, record 2, English, - invariant%20imbedding

Record number: 2, Textual support number: 1 OBS

invariant imbedding: term standardized by ISO.  3, record 2, English, - invariant%20imbedding

Record number: 2, Textual support number: 2 OBS

invariant imbedding: term extracted from the “Glossaire de l’énergie nucléaire” and reproduced with permission of the Organisation for Economic Co-operation and Development.  3, record 2, English, - invariant%20imbedding

Record 2,  Textual support,  French

Record number: 2, Textual support number: 1 DEF

Technique mathématique dans la théorie du transport qui permet d'obtenir des paramètres d'intégration relatifs à une structure (par exemple coefficients de réflexion) sans donner une description détaillée du débit de fluence de neutrons dans la structure.  2, record 2, French, - immersion%20invariante

Record number: 2, Textual support number: 1 OBS

immersion invariante : terme normalisé par l'ISO.  3, record 2, French, - immersion%20invariante

Record number: 2, Textual support number: 2 OBS

immersion invariante : terme extrait du «Glossaire de l’énergie nucléaire» et reproduit avec l’autorisation de l’Organisation de coopération et de développement économiques.  3, record 2, French, - immersion%20invariante

Record 2,  Textual support,  Spanish

Record 3,  Textual support,  English

Record number: 3, Textual support number: 1 OBS

In neutron transport theory, a method of analysis of the transport equation whereby the integral term describing scattering is replaced by a formula of numerical integration.  1, record 3, English, - Wick%2DChandrasekhar%20method

Record 3,  Textual support,  French

Record 3,  Textual support,  Spanish

Record 4,  Textual support,  English

Record number: 4, Textual support number: 1 DEF

A theory for the treatment of neutron or gamma-ray migration in a medium based on the linear Boltzmann transport equation.  1, record 4, English, - transport%20theory

Record number: 4, Textual support number: 1 OBS

transport theory: term and definition standardized by ISO.  2, record 4, English, - transport%20theory

Record 4,  Textual support,  French

Record number: 4, Textual support number: 1 DEF

Théorie pour le traitement de la migration des neutrons ou des rayons gamma dans un milieu, basée sur l'équation linéaire du transport de Boltzmann.  1, record 4, French, - th%C3%A9orie%20du%20transport

Record number: 4, Textual support number: 1 OBS

théorie du transport : terme et définition normalisés par l'ISO.  2, record 4, French, - th%C3%A9orie%20du%20transport

Record 4,  Textual support,  Spanish

Record 5,  Textual support,  English

Record number: 5, Textual support number: 1 DEF

A theory of neutron transport in which all neutrons of a population are assumed to belong to the same neutron energy group.  1, record 5, English, - one%2Dgroup%20theory

Record number: 5, Textual support number: 1 OBS

one-group theory: term and definition standardized by ISO.  2, record 5, English, - one%2Dgroup%20theory

Record 5,  Textual support,  French

Record number: 5, Textual support number: 1 DEF

Théorie du transport des neutrons dans laquelle tous les neutrons d'une population sont supposés appartenir au même groupe de neutrons.  1, record 5, French, - th%C3%A9orie%20%C3%A0%20un%20groupe

Record number: 5, Textual support number: 1 OBS

théorie à un groupe : terme et définition normalisés par l'ISO.  2, record 5, French, - th%C3%A9orie%20%C3%A0%20un%20groupe

Record 5,  Textual support,  Spanish

Record 6,  Textual support,  English

Record number: 6, Textual support number: 1 DEF

The distance beyond the boundary of a medium to a point at which the tangent to the asymptotic neutron flux density at the boundary goes to zero in the one-group theory of neutron transport.  1, record 6, English, - linear%20extrapolation%20distance

Record number: 6, Textual support number: 1 OBS

The asymptotic flux density is the flux density far from boundaries, localized sources, and localized absorbers.  1, record 6, English, - linear%20extrapolation%20distance

Record number: 6, Textual support number: 2 OBS

linear extrapolation distance; augmentation distance: terms and definition standardized by ISO.  2, record 6, English, - linear%20extrapolation%20distance

Record 6,  Textual support,  French

Record number: 6, Textual support number: 1 DEF

Dans la théorie à un groupe du transport des neutrons, distance de la limite d'un milieu au point où la distribution de la densité de flux neutronique asymptotique s'annulerait si elle était représentée au-delà du milieu par la tangente menée en un point de cette limite à la courbe de distribution de la densité asymptotique du flux neutronique dans le milieu.  1, record 6, French, - distance%20d%27extrapolation%20lin%C3%A9aire

Record number: 6, Textual support number: 1 OBS

La densité de flux asymptotique est la densité de flux loin des limites, des sources localisées et des absorbeurs localisés.  1, record 6, French, - distance%20d%27extrapolation%20lin%C3%A9aire

Record number: 6, Textual support number: 2 OBS

distance d'extrapolation linéaire : terme et définition normalisés par l'ISO.  2, record 6, French, - distance%20d%27extrapolation%20lin%C3%A9aire

Record 6,  Textual support,  Spanish

Record 7,  Textual support,  English

Record number: 7, Textual support number: 1 DEF

A theory of neutron slowing-down in which the essential assumptions are that the slowing down process is continuous, and that the spatial transport of neutrons can be treated by diffusion theory.  1, record 7, English, - Fermi%20age%20theory

Record number: 7, Textual support number: 1 OBS

Fermi age theory: term and definition standardized by ISO.  2, record 7, English, - Fermi%20age%20theory

Record 7,  Textual support,  French

Record number: 7, Textual support number: 1 DEF

Théorie du ralentissement des neutrons dans laquelle l'hypothèse essentielle est que le processus de ralentissement est continu et que le transport des neutrons dans l'espace peut être traité à l'aide de la théorie de la diffusion.  1, record 7, French, - th%C3%A9orie%20de%20l%27%C3%A2ge%20de%20Fermi

Record number: 7, Textual support number: 1 OBS

théorie de l'âge de Fermi : terme et définition normalisés par l'ISO.  2, record 7, French, - th%C3%A9orie%20de%20l%27%C3%A2ge%20de%20Fermi

Record 7,  Textual support,  Spanish

Record 8,  Textual support,  English

Record number: 8, Textual support number: 1 CONT

After the depleted fuel assemblies are removed from the reactor, they are placed in a canister … The canister alone, however, is not sufficient to provide adequate gamma or neutron radiation shielding. Therefore, apparatus that provide additional radiation shielding are required during transport, preparation and subsequent dry storage … The additional shielding is achieved by placing the canisters within large cylindrical containers called casks. Casks are typically designed to shield the environment from the dangerous radiation in two ways. First, shielding of gamma radiation requires large amounts of mass. Gamma rays are best absorbed by materials with a high atomic number and a high density, such as concrete, lead, and steel. The greater the density and thickness of the blocking material, the better the absorption/shielding of the gamma radiation.  1, record 8, English, - blocking%20material

Record 8,  Textual support,  French

Record number: 8, Textual support number: 1 CONT

Le conditionnement des matières radioactives. Le conditionnement est un processus industriel qui met en œuvre : - un matériau de blocage qui immobilise les déchets. Ce matériau constitue la matrice - une (ou plusieurs) enveloppe(s), dans laquelle (lesquelles) les déchets immobilisés sont placés, facilitant ainsi principalement la manutention. L’ensemble est appelé colis.  2, record 8, French, - mat%C3%A9riau%20de%20blocage

Record 8,  Textual support,  Spanish

Record 9,  Textual support,  English

Record number: 9, Textual support number: 1 DEF

The distance beyond the boundary of a medium to a point at which the asymptotic neutron flux density would go to zero if it were represented by the same function as within the boundary in the one-group theory of neutron transport.  1, record 9, English, - extrapolation%20distance

Record number: 9, Textual support number: 1 OBS

The asymptotic flux density is the flux density far from boundaries, localized sources, and localized absorbers.  1, record 9, English, - extrapolation%20distance

Record number: 9, Textual support number: 2 OBS

extrapolation distance; augmentation distance: terms and definition standardized by ISO.  2, record 9, English, - extrapolation%20distance

Record 9,  Textual support,  French

Record number: 9, Textual support number: 1 DEF

Dans la théorie à un groupe du transport des neutrons, distance de la limite d'un milieu jusqu'au point extérieur à cette limite où la densité de flux neutronique asymptotique s'annulerait si elle était représentée par la même fonction qu'en deçà de la limite.  1, record 9, French, - longueur%20extrapol%C3%A9e

Record number: 9, Textual support number: 1 OBS

La densité de flux asymptotique est la densité de flux loin des limites, des sources localisées et des absorbeurs localisés.  1, record 9, French, - longueur%20extrapol%C3%A9e

Record number: 9, Textual support number: 2 OBS

longueur extrapolée : terme et définition normalisés par l'ISO.  2, record 9, French, - longueur%20extrapol%C3%A9e

Record 9,  Textual support,  Spanish

Record 10,  Textual support,  English

Record number: 10, Textual support number: 1 DEF

A method for calculating the attenuation of neutron and gamma-radiation by using the transport equation to determine spatial moments of particle flux density.  1, record 10, English, - moments%20method

Record number: 10, Textual support number: 1 OBS

mean range: term and definition standardized by ISO in 1997.  2, record 10, English, - moments%20method

Record 10,  Textual support,  French

Record number: 10, Textual support number: 1 DEF

Méthode de calcul de l'atténuation de rayonnements neutroniques et gamma utilisant l'équation du transport pour déterminer les moments spatiaux du débit de fluence de particules.  1, record 10, French, - m%C3%A9thode%20des%20moments

Record number: 10, Textual support number: 1 OBS

méthode des moments : terme et définition normalisés par l'ISO en 1997.  2, record 10, French, - m%C3%A9thode%20des%20moments

Record 10,  Textual support,  Spanish

Record 11,  Textual support,  English

Record number: 11, Textual support number: 1 CONT

Computational capability has been developed to calculate sensitivity coefficients of generalized responses with respect to cross-section data in the SCALE code system. The focus of this paper is the implementation of generalized perturbation theory(GPT) for one-dimensional and two-dimensional deterministic neutron transport calculations. GPT is briefly summarized for computing sensitivity coefficients for reaction rate ratio responses within the existing framework of the TSUNAMI sensitivity and uncertainty(S/U) analysis code package in SCALE. GPT provides the capability to analyze generalized responses related to reactor analysis, such as homogenized cross-sections, relative powers, and conversion ratios, as well as measured experimental parameters.  1, record 11, English, - generalized%20perturbation%20theory

Record number: 11, Textual support number: 1 OBS

The SCALE code system includes a sensitivity and uncertainty (S/U) analysis code package called TSUNAMI. TSUNAMI originally focused on keff responses for criticality safety analysis and included the capability to compute sensitivity coefficients using forward and adjoint solutions from three-dimensional Monte Carlo or one-dimensional (1D) discrete ordinates eigenvalue calculations.  1, record 11, English, - generalized%20perturbation%20theory

Record 11,  Textual support,  French

Record number: 11, Textual support number: 1 CONT

Méthode GPT. Au milieu des années 1960, Usachev, Lewins et Gandini généralisèrent la théorie des perturbations à toute sorte d’observable, paramètre physique pouvant être mesuré (et/ou calculé), qui peut être représenté sous la forme d’un rapport de quantités intégrales, linéaires du flux et/ou du flux adjoint. Pour reconstruire la valeur d’un observable d’un système multiplicateur dans des conditions perturbées, la théorie généralisée des perturbations […] fait appel à une fonction particulière, dite fonction importance généralisée, qui est la solution unique de l’équation du bilan adjointe du système à laquelle on ajoute un terme inhomogène, appelé source généralisée. Ce terme, qui est strictement orthogonal au mode fondamental, contient, au premier ordre, l’information sur la nature de la perturbation et son impact sur le flux.  1, record 11, French, - th%C3%A9orie%20g%C3%A9n%C3%A9ralis%C3%A9e%20des%20perturbations

Record 11,  Textual support,  Spanish

Record 12,  Textual support,  English

Record number: 12, Textual support number: 1 CONT

Transport correction. Much of the error due to the diffusion approximation comes from the assumption of isotopic scattering.(This assumption is necessary to reach the simple form of the integral transport [and] was also made to establish Fick's law when we assume that when a neutron leaving dV had probability d^{2 omega}/4[ pi] of hitting dS where d^{2 omega} was the solid angle under which dS is seen from the point of emission). The transport correction established from the differential form of the transport operator can compensate for most of this error. Because it is simple to introduce, it is always used in practice. It consists of replacing the total cross-section [sigma] with the so-called “transport” cross-section in the expression for the diffusion of the coefficient.  1, record 12, English, - %20transport%20correction

Record 12,  Textual support,  French

Record number: 12, Textual support number: 1 CONT

Correction de transport. Éliminer [oméga] des équations est évidemment une simplification incontestable! Mais a-t-on le droit de supposer que les neutrons sortent des collisions de façon isotrope? Ce n’est évidemment pas exact en toute rigueur, mais on constate qu’en général l’erreur due à cette hypothèse est peu importante, surtout si l’on fait une correction dite de transport consistant à remplacer la section efficace totale [oméga indice t], par la section efficace de transport […]  1, record 12, French, - correction%20de%20transport

Record 12,  Textual support,  Spanish

Record 13,  Textual support,  English

Record number: 13, Textual support number: 1 CONT

The theory of physics of heavy-ion transport is well developed, although modeling of the complex interacting processes is only approximate. Generally it states that : nuclei of GCR [galactic cosmic radiation] slowed down as a result of ionization losses, GCR primaries are fragmented as they interact in materials and continue to transport fragments(projectile secondaries), recoil neutrons are formed from proton and neutron collisions, and neutrons, protons and alphas(target secondaries) are produced in inelastic proton collisions.  1, record 13, English, - recoil%20neutron

Record 13,  Textual support,  French

Record number: 13, Textual support number: 1 CONT

[…] un appareillage capable de détecter avec une efficacité voisine de 1 les mésons […] et de mesurer avec une bonne précision la direction et l'énergie des neutrons de recul créés dans la réaction d'échange de charge.  1, record 13, French, - %20neutron%20de%20recul

Record 13,  Textual support,  Spanish

Record 14,  Textual support,  English

Record number: 14, Textual support number: 1 DEF

A theory of neutron transport using the multigroup model.  1, record 14, English, - multigroup%20theory

Record number: 14, Textual support number: 1 OBS

multigroup theory: term and definition standardized by ISO.  2, record 14, English, - multigroup%20theory

Record 14,  Textual support,  French

Record number: 14, Textual support number: 1 DEF

Théorie du transport des neutrons utilisant le modèle à plusieurs groupes.  3, record 14, French, - th%C3%A9orie%20multigroupe

Record number: 14, Textual support number: 1 OBS

théorie à plusieurs groupes : terme et définition normalisés pqr l'ISO.  4, record 14, French, - th%C3%A9orie%20multigroupe

Record 14,  Textual support,  Spanish

Record 16,  Textual support,  English

Record number: 16, Textual support number: 1 DEF

An approximate method for solving the transport equation, related to the spherical harmonics method and based on two expansions of the angular dependence of the differential particle flux density, one in the forward direction and one in the backward direction. This method is used mainly when there is a marked change of neutron characteristics across a boundary.  2, record 16, English, - double%20spherical%20harmonics%20approximation%20method

Record number: 16, Textual support number: 1 OBS

"Double spherical harmonics method" and "Yvon’s method" have been standardized by ISO.  4, record 16, English, - double%20spherical%20harmonics%20approximation%20method

Record 16,  Textual support,  French

Record number: 16, Textual support number: 1 DEF

Méthode approchée de résolution de l'équation du transport, analogue à la méthode des harmoniques sphériques et fondée sur deux développements du débit de fluence différentiel en fonction de l'angle, dans deux directions opposées. Cette méthode est surtout utilisée lorsque les caractéristiques neutroniques présentent un changement marqué au passage d'une frontière.  3, record 16, French, - m%C3%A9thode%20des%20doubles%20harmoniques%20sph%C3%A9riques

Record number: 16, Textual support number: 1 OBS

"Méthode des doubles harmoniques sphériques" et "méthode d'Yvon" ont été normalisés par l'ISO.  4, record 16, French, - m%C3%A9thode%20des%20doubles%20harmoniques%20sph%C3%A9riques

Record 16,  Textual support,  Spanish

Record 17,  Textual support,  English

Record number: 17, Textual support number: 1 CONT

Trip Logic.... With general coincidence logic the final shutdown action is initiated by the actuation of any trip sensor in one instrumentation channel combined with the actuation of any trip sensors in the other instrumentation channels(e. g., in a 3-channel system, high heat transport pressure in one channel, high neutron flux in another channel).  1, record 17, English, - general%20coincidence%20logic

Record 17,  Textual support,  French

Record number: 17, Textual support number: 1 CONT

Logique de déclenchement. [...] Dans une logique à coïncidence générale, l'arrêt final est provoqué par l'actionnement de tout détecteur de déclenchement dans un canal d'instrumentation combiné avec l'actionnement de tout autre détecteur de déclenchement dans les autres canaux d'instrumentation (e.g., dans un système à 3 canaux, pression élevée du caloporteur dans un canal, flux neutronique élevé dans un autre canal).  1, record 17, French, - logique%20%C3%A0%20co%C3%AFncidence%20g%C3%A9n%C3%A9rale

Record 17,  Textual support,  Spanish