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FUEL LEAK [10 records]

Record 1 2017-03-31

English

Subject field(s)
  • Scientific Measurements and Analyses
  • Nuclear Plant Safety
  • Nuclear Fission Reactors
CONT

Reducing Solid Radioactive Fuel Waste From The EPR... These technical provisions with HTC fuel management allow... so-called "low leak" loading plans with higher power/burn up layers in the cores.

French

Domaine(s)
  • Mesures et analyse (Sciences)
  • Sûreté des centrales nucléaires
  • Réacteurs nucléaires de fission
CONT

Une fois acquise la certitude que des collectrons rhodium pouvaient être utilisés dans les conditions d'exploitation des tranches françaises, il est alors possible de concevoir un système de mesure interne qui offre un intérêt économique. [...] Une des stratégies envisagée est d'implanter dans le cœur un plan de chargement dit «à faibles fuites» qui permet, en diminuant les fuites neutroniques, d'augmenter la longueur de cycle. Cependant, un tel plan de chargement provoque une augmentation des facteurs de points chauds ce qui diminue les marges de fonctionnement.

Spanish

Save record 1

Record 2 2012-02-13

English

Subject field(s)
  • Optics
  • Analytical Chemistry
DEF

The section of the mass spectrometer in which the beam of ions emerging from the ion source is separated into a series of beams, according to the mass-to-charge ratios.

CONT

Mass spectrometers, which operate under high vacuum, consist of four basic parts: a handling system ...; an ionization chamber ...; an analyzer, in which the particles in the beam are separated according to mass; and a detector ...

CONT

Mass analyzers are systems designed to identify and measure materials according to their molecular weights. The technique has been adapted for many other applications ranging from physics research and the identification of complex molecular structure to assuring the integrity of the fuel systems on the space shuttle and routine helium leak detection. While the uses of mass analyzers in the microelectronics industry include some exotic applications, such as SIMS, the greatest number of systems are used for various types of gas analysis. Applications for mass analyzers include process monitoring, process engineering and control in such areas as evaporation, MBE, sputter etch and deposition, plasma etch and deposition, ion, implantation, LPCVD, CVD, and diffusion furnaces. Another important application is high purity gas certification and electronic gas mixture verification.

Key term(s)
  • analyser
  • mass analyzer

French

Domaine(s)
  • Optique
  • Chimie analytique
CONT

Un spectromètre de masse comprend quatre éléments essentiels : 1. un système de prélèvement et de transport de l'échantillon vers la source d'ions; 2. une source d'ions [...] 3. un analyseur qui, au moyen de combinaisons variées de champs électriques et magnétiques, sépare les espèces ioniques en faisceaux distincts qu'il filtre, selon le rapport m/e de leur masse à leur charge; 4. un détecteur [...]

Spanish

Campo(s) temático(s)
  • Óptica
  • Química analítica
Save record 2

Record 3 2010-03-01

English

Subject field(s)
  • Fluid Mechanics and Hydraulics (Physics)
  • Nuclear Fission Reactors
CONT

Method and device for detecting a leak from a fuel element of an assembly for a nuclear reactor. The detection of the defective fuel assemblies may be effected under water in the pool, by acoustic, ultrasonic or eddy current methods of measurement. It is also possible to use cells called sipping test containers in which the release of radioactive products by the fuel assembly is promoted, these radioactive products being subsequently carried away by the water or a gas into a unit enabling them to be detected.

French

Domaine(s)
  • Mécanique des fluides et hydraulique (Physique)
  • Réacteurs nucléaires de fission
CONT

Dans le cas d'un combustible nucléaire, le ressuage d'un gaz (généralement un produit de fission gazeux) permet de détecter des assemblages contenant des crayons non étanches. Cette opération est effectuée dans une cellule spéciale (cellule de ressuage) disposée soit dans la piscine du réacteur (dans le cas des Rep [réacteurs à eau pressurisée]), soit à l'entrée de l'usine du traitement des combustibles usés.

Spanish

Save record 3

Record 4 2009-10-26

English

Subject field(s)
  • Nuclear Plant Safety
  • Nuclear Physics
CONT

A second cooling function is provided for safety reasons, to deal with the possibility of a loss of primary coolant circuit function during operation of the reactor. A breach in the primary coolant circuit, for example, could allow the core to overheat, resulting in damage to the nuclear fuel. A pressurizer arrangement injects additional coolant into the circuit to maintain operational pressure and to replace coolant that may be lost through a minor breach or leak in the coolant circuit.

French

Domaine(s)
  • Sûreté des centrales nucléaires
  • Physique nucléaire
CONT

Petite brèche. L'accident de perte de réfrigérant primaire par petite brèche est supposé être initié : - soit par la rupture partielle d'une grosse tuyauterie primaire; - soit par la rupture d'une petite tuyauterie branchée au circuit primaire; - soit par une soupape de sûreté restée coincée ouverte après fonctionnement (cas de l'accident de Three Mile Island).

Spanish

Save record 4

Record 5 2009-10-26

English

Subject field(s)
  • Nuclear Plant Safety
  • Nuclear Physics
CONT

A second cooling funtion is provided for safety reasons, to deal with the possibility of a loss of primary coolant circuit function during operation of the reactor. A breach in the primary coolant circuit, for example, could allow the core to overheat, resulting in damage to the nuclear fuel. A pressurizer arrangement injects additional coolant into the circuit to maintain operational pressure and to replace coolant that may be lost through a minor breach or leak in the coolant circuit. Various techniques are known for cooling the reactor core in the event of a major breach such as the rupture of a conduit in the primary coolant circuit. Neutron absorbing control rods can be inserted into the fuel array quickly to damp the nuclear reaction, for example when the sensed coolant pressure drops.

French

Domaine(s)
  • Sûreté des centrales nucléaires
  • Physique nucléaire
CONT

Grosse brèche. Ce type d'accident de perte de réfrigérant primaire (APRP) est supposé initié par la rupture franche et complète d'une branche froide du circuit primaire (dite rupture guillotine). Le fluide s'écoule alors par les deux tronçons ouverts. La décompression est rapide : l'écoulement est homogène et les phénomènes gravitaires ne jouent qu'un rôle marginal.

Spanish

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Record 6 2008-03-26

English

Subject field(s)
  • Aeronautical Engineering and Maintenance
DEF

To connect again.

CONT

Confirming that the fuel/oil heat exchanger was not the source of the leak, the technicians prepared to reconnect the LP [low-pressure] fuel line and ordered replacement seal rings.

French

Domaine(s)
  • Aérotechnique et maintenance
CONT

Ayant confirmé que l'échangeur de chaleur carburant/huile n'était pas la source de la fuite, les techniciens se sont préparés à rebrancher la conduite de carburant basse pression et ils ont commandé des joints toriques de remplacement.

OBS

connecter : Unir par une connexion, mettre en liaison [...]

OBS

brancher : Rattacher (une conduite, un circuit secondaire) à une canalisation, à un circuit principal.

OBS

reconnecter; rebrancher : termes uniformisés par le Comité d'uniformisation de la terminologie aéronautique (CUTA) - Maintenance.

Spanish

Save record 6

Record 7 2007-04-16

English

Subject field(s)
  • Exhaust Systems (Motor Vehicles)
DEF

Combustion gases, composed of water vapor and unburned fuel, that leak past the piston rings into the crankcase during normal engine operation.

CONT

As long as the PCV (positive crankcase ventilating) valve was working and the hoses and intake manifold port were open, blowby gases were recycled to the combustion chambers.

Key term(s)
  • blow-by gas
  • blow-by

French

Domaine(s)
  • Échappement (Véhicules automobiles)

Spanish

Save record 7

Record 8 2006-10-26

English

Subject field(s)
  • Chemistry
DEF

An inert light gas, He, which is odorless, colorless, and not flammable.

CONT

Helium is extracted from natural gas sources in the Texas and Oklahoma ... and Southwest Kansas ... The element is believed to be trapped in the natural gas pockets after disintegration from uranium and thorium.

CONT

... uses for helium[ :] filling party balloons as it is a much safer gas(non-flammable) ;widely used as an inert gas shield for arc welding; high speed push gas inside air to air missiles for guidance corrections; protective gas in growing silicon and germanium crystals, and in titanium and zirconium production; cooling medium for nuclear reactors, helium won’t become radioactive; a mixture of 80% helium and 20% oxygen is used as an artificial atmosphere for divers and others working under pressure; cryogenics and superconductivity; rare document preservation... Independence) ;as a gas for supersonic wind tunnels; pressurizing agent for liquid fuel rockets(inert so won’t react) ;leak detection agent for extremely small leaks; nuclear detonation simulations(using conventional explosives) ;isotopic dating by helium ratios(seawater, ocean beds, etc) ;helium/neon lasers; helium cardio-pulmonary resuscitation pump(heart surgery) ;helium filled border patrol "AEROSTAT" monitoring blimps.

OBS

Helium has an atomic number of 2, an atomic weight of 4, density of 0.1785 kg/m³ at STP. Helium can be liquefied at 4.2 K (-269°C).

French

Domaine(s)
  • Chimie
DEF

Gaz rare le plus léger.

OBS

(Élément de symbole He). Numéro atomique : 2. Masse atomique : 4,0026. Température de fusion : -269,7 °C. Température d'ébullition : -268,934 °C. Masse volumique : 0,126 g/cm³. État d'oxydation : 0.

OBS

Gaz rare utilisé en mélange pour la plongée profonde.

Spanish

Campo(s) temático(s)
  • Química
Save record 8

Record 9 2000-05-25

English

Subject field(s)
  • Burners and Steamfitting
DEF

A pilot that burns without turndown throughout the entire time the burner assembly is in service, whether the main burner is firing or not. The pilot ignites fuel which may leak into the combustion chamber when the burner is off, thus preventing a hazardous condition at startup.

OBS

"Continuous Pilot" is Underwriters Laboratories Inc. term for the old term "Standing Pilot."

French

Domaine(s)
  • Fumisterie et brûleurs
CONT

Chauffage [...] Les principaux organes de sécurité sont les suivants : [...] un dispositif d'allumage se composant soit d'un brûleur d'allumage à veilleuse permanente actionné manuellement, soit d'un éclateur avec transformateur.

Spanish

Save record 9

Record 10 1986-10-08

English

Subject field(s)
  • Aircraft Airframe
  • Aeroindustry
OBS

Fuel dams, composed of PR 1422 sealant, and fuel drain holes are located at points in the wing leading edge. The dams divert any fuel entering the leading edge to drain holes in the lower surface. Fuel dripping from drain holes indicates possible fuel tank leak, therefore it is essential that drain holes adjacent to fuel dams be kept open....

OBS

Fabricated Dams are used to direct fluid drainage. ... Fluid drains are located at positions in the fuselage where a dam formed by structures might collect moisture or other fluids.

French

Domaine(s)
  • Cellule d'aéronefs
  • Constructions aéronautiques
OBS

guide d'écoulement : terme accepté par le Comité de la terminologie des cartes de travail DC-9.

Spanish

Save record 10

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