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UNF [3 records]

Filter results by subject field Alphabetical list of terms

Filter results by subject field

Alphabetical list of terms

Record 1 - external organization data 2011-09-28

English

Subject field(s)
  • Atomic Physics
  • Nuclear Science and Technology
  • Nuclear Power Stations
  • Compartment - Canadian Nuclear Safety Commission
DEF

Nuclear reactor fuel that has been irradiated to the extent that it can no longer effectively sustain a chain reaction because its fissionable isotopes have been partially consumed and fission-product poisons have accumulated in it.

OBS

[This] reactor fuel material ... has lost its useful content of fissile (fissionable) material.

OBS

Spent fuel from nuclear power stations is regarded as waste in Canada because no further use is envisaged for it, whereas in countries where reprocessing is undertaken, it is not considered waste.

OBS

spent fuel: term standardized by ISO.

French

Domaine(s)
  • Physique atomique
  • Sciences et techniques nucléaires
  • Centrales nucléaires
  • Tiroir - Commission canadienne de sûreté nucléaire
DEF

Combustible nucléaire dont le niveau d'irradiation atteint les limites prévues dans un réacteur déterminé et qui ne peut plus être utilisé ultérieurement dans ce réacteur sans avoir subi un traitement approprié.

CONT

En France, lorsque le combustible a été utilisé (on dit aussi irradié), il est traité chimiquement de façon à séparer l'uranium, (U), le plutonium (Pu), les produits de fission (PF) et autres radioéléments. [...] Avant d'être retraité, le combustible irradié, dont la radioactivité est considérable, est stocké dans des piscines d'abord sur le site de la centrale puis à l'usine de retraitement, afin de permettre la décroissance des produits radioactifs de courte période.

OBS

combustible épuisé : terme normalisé par l'ISO.

Spanish

Campo(s) temático(s)
  • Física atómica
  • Ciencia y tecnología nucleares
  • Centrales nucleares
  • Compartimiento - Comisión Canadiense de Seguridad Nuclear
Key term(s)
  • combustible nuclear quemado
  • combustible nuclear gastado
  • combustible nuclear consumido
  • combustible nuclear usado
Save record 1

Record 2 2000-03-16

English

Subject field(s)
  • International Bodies and Committees
OBS

Mission: The United Nations Foundation seeks to support the goals and objectives of the United Nations and its Charter in order to promote a more peaceful, prosperous, and just world - with special emphasis on the UN's work, especially on behalf of economic, social, environmental and humanitarian causes.

French

Domaine(s)
  • Organismes et comités internationaux
OBS

Renseignements obtenus de l'organisme.

Key term(s)
  • Fondation des Nations Unies

Spanish

Save record 2

Record 3 1988-12-22

English

Subject field(s)
  • Joining Elements (Mechanical Components)
CONT

Unified and American National screw thread standards for screws, bolts, nuts, and other threaded parts consist of six series of threads and a selection of special threads that cover nonstandard combinations of diameter and pitch. In general, the unified screw threads are limited to three series: coarse (UNC), fine (UNF), and extrafine (UNEF). A 1/4-inch.-diameter thread in the UNC series has 20 threads/in., while in the UNF series it has 28. ... The fine thread series (UNF and NF) is recommended for general use in the automotive and air craft fields for threads subject to strong vibration. In general, a fine thread should be used only where close adjustment, extra strength, or increased resistance to loosening is a factor.

CONT

Threads are designated by standardized notes. Under the unified system, threads are specified by giving in order the nominal diameter, number of threads per inch, the initial letters such as UNC or UNF that identify the series, and class of thread (1A, 2A, and 3A or 1B, 2B, and 3B). Threads are considered to be right-hand and single unless otherwise noted; therefore the specification for a left-hand thread must have the letters LH included.

CONT

[Example of a thread identification by standardized symbols]: 1/2-13UNC-2ALH.

French

Domaine(s)
  • Éléments d'assemblage (Composants mécaniques)
CONT

Norme BS 1580 : 1953 "Unified Screw Threads". Il s'agit des filetages cylindriques de mécanique générale, au profil ISO, mais avec les cotes en pouces. Depuis 1949, le Royaume-Uni, le Canada et les États-Unis se sont mis d'accord sur ces filetages et leur désignation : "UNC" pour "Unified coarse thread" (gros pas). "UNF" pour "Unified fine thread" (pas fin). "UNEF" pour "Unified extra-fine thread" (pas extra-fin). "UN" pour "Unified constant pitch" (pas constant). Ces filetages figurent [...] d'une manière plus complète dans la norme américaine ASA B1.1-1960 qui concerne les filetages unifiés.

Spanish

Save record 3

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