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NUCLEAR SHELL [3 records]
Record 1 - internal organization data 2023-02-23
Record 1, English
Record 1, Subject field(s)
- Nuclear Fission Reactors
- Applications of Automation
Record 1, Main entry term, English
- finger walker
1, record 1, English, finger%20walker
correct
Record 1, Abbreviations, English
Record 1, Synonyms, English
- maintenance spider 2, record 1, English, maintenance%20spider
correct
Record 1, Textual support, English
Record number: 1, Textual support number: 1 CONT
The "finger walker" is a fascinatingly complex device remotely operated to cling to the overhead tube sheet of a nuclear boiler. Personnel, operating the finger walker from a safe distance outside the boiler shell, "walk" the support structure over the surface of the tube sheet to enable inspection equipment mounted on the structure to ferret out suspicious tubes. 3, record 1, English, - finger%20walker
Record 1, French
Record 1, Domaine(s)
- Réacteurs nucléaires de fission
- Automatisation et applications
Record 1, Main entry term, French
- araignée de maintenance
1, record 1, French, araign%C3%A9e%20de%20maintenance
correct, feminine noun
Record 1, Abbreviations, French
Record 1, Synonyms, French
Record 1, Textual support, French
Record number: 1, Textual support number: 1 DEF
Outil robotisé, mû par des bras articulés, destiné à contrôler ou à réparer de l'intérieur les tubes des générateurs de vapeur du circuit de refroidissement primaire d'un réacteur de puissance. 1, record 1, French, - araign%C3%A9e%20de%20maintenance
Record number: 1, Textual support number: 1 OBS
araignée de maintenance : désignation et définition publiées au Journal officiel de la République française le 2 février 2023. 2, record 1, French, - araign%C3%A9e%20de%20maintenance
Record 1, Spanish
Record 1, Textual support, Spanish
Record 2 - internal organization data 2017-04-13
Record 2, English
Record 2, Subject field(s)
- Nuclear Fission Reactors
Record 2, Main entry term, English
- fuel pebble
1, record 2, English, fuel%20pebble
correct
Record 2, Abbreviations, English
Record 2, Synonyms, English
- pebble 2, record 2, English, pebble
correct
- spherical fuel element 3, record 2, English, spherical%20fuel%20element
correct
- spherical element 4, record 2, English, spherical%20element
Record 2, Textual support, English
Record number: 2, Textual support number: 1 CONT
In the most common type of high temperature reactor (HTR) fuel, tiny particles of nuclear fuel are coated with three or four layers of coatings which are impenetrable to fission products up to a temperature of 2000 celsius. About 20,000 particles, bonded with graphite are massed together to form a spherical fuel element with a diameter of about 6 centimeters. The high temperature reactor ... might contain 100,000 or more of these fuel elements. 5, record 2, English, - fuel%20pebble
Record number: 2, Textual support number: 2 CONT
The pebbles are... designed to passively limit the amount of heat unleashed by the nuclear fission reactions that drive the reactor. The fissionable material is divided into groups of 100 million billion uranium-235 atoms scattered within a 0. 5 mm sphere of uranium dioxide. That core is coated with four containment layers.... Some 15, 000 carbon-coated uranium dioxide kernels, looking like nuclear poppy seeds, are embedded in a tennis ball-size graphite and resin matrix. Graphite acts to slow the fission neutrons and so acts as an embedded moderator. The matrix is then encased in a 5 mm pure carbon shell, sintered, annealed, and machined to a uniform diameter of 6 cm. 2, record 2, English, - fuel%20pebble
Record 2, French
Record 2, Domaine(s)
- Réacteurs nucléaires de fission
Record 2, Main entry term, French
- boulet
1, record 2, French, boulet
correct, masculine noun
Record 2, Abbreviations, French
Record 2, Synonyms, French
Record 2, Textual support, French
Record number: 2, Textual support number: 1 CONT
Les particules [de combustible] sont agglomérées au moyen d'une matrice carbonée de manière à former des corps sphériques [...] aisément manipulables. [...] le combustible est sous forme de boulets de 60 mm de diamètre, ayant une écorce de 5 mm sans particule, chargés en vrac dans le cœur [du réacteur qui] est formé par un très grand nombre de boulets (675 000 pour [un réacteur] THTR [thorium high temperature reactor] de 300 MW de puissance électrique). L'ensemble de ces boulets est contenu dans une large trémie en graphite, faisant office de réflecteur, munie au sommet d'un couvercle de même matière, et d'un (ou plusieurs) trou d'évacuation des combustibles à la base. 2, record 2, French, - boulet
Record number: 2, Textual support number: 2 CONT
Chaque boulet mesure environ 60 mm de diamètre et renferme environ 11 500 particules. L'extérieur du boulet, sur 5 mm, ne contient pas de particule, renforçant ainsi le confinement des matières radioactives dans la matrice de graphite. Le cœur du réacteur sera constitué par un empilement de plusieurs centaines de milliers de boulets. 3, record 2, French, - boulet
Record 2, Spanish
Record 2, Textual support, Spanish
Record 3 - internal organization data 1994-12-05
Record 3, English
Record 3, Subject field(s)
- Nuclear Fission Reactors
Record 3, Main entry term, English
- wet cooling tower 1, record 3, English, wet%20cooling%20tower
Record 3, Abbreviations, English
Record 3, Synonyms, English
Record 3, Textual support, English
Record number: 3, Textual support number: 1 CONT
A cooling tower basically consists of an air circuit and a water circuit leading to a heat exchange vessel in which the air and water are brought into contact. By a stack effect, i. e. by natural draft, the cooling tower shell provides air circulation. When, as is the case with the wet cooling towers at EDF thermal and nuclear plants, the air and water are placed in direct contact in the heat exchange vessel, the hot air escaping from the shell is saturated with steam : mixing with the colder outside air produces by steam condensation a plume whose structure is similar to a natural cloud. 1, record 3, English, - wet%20cooling%20tower
Record 3, French
Record 3, Domaine(s)
- Réacteurs nucléaires de fission
Record 3, Main entry term, French
- réfrigérant humide
1, record 3, French, r%C3%A9frig%C3%A9rant%20humide
correct, masculine noun
Record 3, Abbreviations, French
Record 3, Synonyms, French
Record 3, Textual support, French
Record number: 3, Textual support number: 1 CONT
Lorsque, ce qui est le cas des réfrigérants humides équipant les centrales thermiques et nucléaires d'EDF, l'air et l'eau sont mis en contact direct dans le corps d'échange, l'air chaud qui s'échappe de la coque est saturé de vapeur d'eau : le mélange avec l'air ambiant, plus froid, produit, par condensation de la vapeur, un panache dont la structure s'apparente à celle d'un nuage naturel. 1, record 3, French, - r%C3%A9frig%C3%A9rant%20humide
Record 3, Spanish
Record 3, Textual support, Spanish
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