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NEUTRON HARDENING [3 records]

Filter results by subject field Alphabetical list of terms

Filter results by subject field

Alphabetical list of terms

Record 1 2015-04-28

English

Subject field(s)
  • Atomic Physics
DEF

The spectral hardening of neutrons.

OBS

neutron hardening : term and definition standardized by ISO.

French

Domaine(s)
  • Physique atomique
OBS

durcissement du spectre des neutrons : terme normalisé par l'ISO.

Spanish

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Record 2 2015-04-24

English

Subject field(s)
  • Nuclear Physics
DEF

The increase in the average energy of neutrons diffusing in an assembly due to either spectral hardening or the preferential diffusion of higher-energy neutrons from an external neutron source.

OBS

diffusion heating: term and definition standardized by ISO.

French

Domaine(s)
  • Physique nucléaire
DEF

Augmentation de l'énergie moyenne des neutrons diffusant dans un assemblage par suite du durcissement du spectre ou de la diffusion préférentielle de neutrons plus énergétiques provenant d'une source de neutrons extérieure.

OBS

réchauffement par diffusion : terme et définition normalisés par l'ISO.

Spanish

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Record 3 2009-09-17

English

Subject field(s)
  • Metallography
  • Nuclear Fission Reactors
CONT

Irradiation-Induced Stress Corrosion Cracking of Austenitic Stainless Steels. In recent years, failures of reactor internal components have been observed after the components have reached neutron fluence levels... The general pattern of the observed failures indicates that as nuclear plants age and fluence increases, various apparently nonsensitized austenitic stainless steels become susceptible to intergranular failure... Irradiation produces defects and defect clusters in grain matrices and alters the dislocation network, dislocation loop, and dislocation channel structures, leading to radiation-induced hardening. Irradiation also leads to changes in the stability of second-phase precipitates and the local chemistry near grain boundaries, precipitates, and defect clusters.

Key term(s)
  • irradiation assisted stress corrosion
  • irradiation induced stress corrosion

French

Domaine(s)
  • Métallographie
  • Réacteurs nucléaires de fission
CONT

Principaux modes de dégradation sous irradiation [...] Les modifications [...] créées sous irradiation peuvent entraîner des conséquences à l'échelle du composant : altérations dimensionnelles (gonflement, croissance, fluage...), évolution des caractéristiques mécaniques (notamment durcissement et fragilisation), sensibilisation accrue au milieu chimique (corrosion sous contrainte assistée par l'irradiation) [...] L'effet simultané de ces modifications peut dans certains cas conduire à des synergies très néfastes (par exemple dans le cas des interactions pastille de combustible-gaine ou absorbant-gaine).

Spanish

Save record 3

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