Abstract:
A pressurized water reactor (PWR) includes a pressure vessel and a nuclear reactor core disposed in the pressure vessel. A baffle plate is disposed in the pressure vessel and separates the pressure vessel into an internal pressurizer volume disposed above the baffle plate and an operational PWR volume disposed below the baffle plate. The baffle plate comprises first and second spaced apart plates, and includes a pressure transfer passage having a lower end in fluid communication with the operational PWR volume and an upper end in fluid communication with the internal pressurizer volume at a level below an operational pressurizer liquid level range. A vent pipe has a lower end in fluid communication with the operational PWR volume and an upper end in fluid communication with the internal pressurizer volume at a level above the operational pressurizer liquid level range.
Abstract:
An integral pressurized light water reactor having most of the components of a primary side of a pressurized water reactor nuclear steam supply system housed in a single pressure vessel with a pressurizer separated from the remaining reactor system by a surge separator having multiple layers of separated steel plates with a number of concentric baffles extending therebetween. A circuitous flow path is provided through and between the plates and concentric baffles and a relatively stagnant pool of coolant is maintained within an innermost zone between the plates to provide thermal isolation.
Abstract:
A pressurized water reactor (PWR) includes a vertical cylindrical pressure vessel having a lower portion containing a nuclear reactor core and a vessel head defining an integral pressurizer. A reactor coolant pump (RCP) mounted on the vessel head includes an impeller inside the pressure vessel, a pump motor outside the pressure vessel, and a vertical drive shaft connecting the motor and impeller. The drive shaft does not pass through the integral pressurizer. The drive shaft passes through a vessel penetration of the pressure vessel that is at least large enough for the impeller to pass through.
Abstract:
The method for filling water into and changing the air of a main circuit (1) of a water-cooled nuclear reactor includes a step (1) of placing a connecting and fluid insulation device (30) which is connected to a hot leg (3) of each cooling loop (11, 12) of the main circuit so as to substantially insulate, from inside the tank, the assembly of hot legs. The method also includes a step of injecting water through an injection circuit (50) on at least one hot leg (3) until each cooling loop is filled with water having changed the air from a steam generator (6) and until the water level (20) in the tank reaches above the side openings (21) of the tank that correspond to the loops (11, 12), after which the connecting device (30) is taken out of the tank. The connecting device (30) is capable of using telescopic connection elements (321).
Abstract:
Le réacteur nucléaire comprend une cuve (3) et un pressuriseur (15) logé dans la cuve (3). Les éléments chauffants (13) du pressuriseur sont entièrement logés dans le pressuriseur (5), seuls les conducteurs électriques (17) sortant de la cuve (3) par des pénétrations électriques (51).
Abstract:
Dispositif passif de régulation de pression dans une enceinte, enceinte et installation associée Ce dispositif comporte un ensemble (40) de pulvérisation de fluide dans l'enceinte, et une conduite (42) d'alimentation de fluide destinée à fournir du fluide à l'ensemble de pulvérisation (40). Il comporte un réceptacle intermédiaire (46) de répartition du fluide, interposé entre la conduite d'alimentation (42) et l'ensemble de pulvérisation (40), le réceptacle intermédiaire (46) étant raccordé en amont à la conduite d'alimentation (42) et comportant une paroi latérale (52) d'évacuation de fluide délimitant des orifices traversants (60) raccordés à l'ensemble de pulvérisation (40). Il comprend au moins une conduite (44A à 44D) d'évacuation de fluide vers l'enceinte (19) faisant saillie dans le réceptacle intermédiaire (46) en regard de la paroi latérale (52).
Abstract:
A pressurized water reactor (PWR) includes a pressure vessel and a nuclear reactor core disposed in the pressure vessel. A baffle plate is disposed in the pressure vessel and separates the pressure vessel into an internal pressurizer volume disposed above the baffle plate and an operational PWR volume disposed below the baffle plate. The baffle plate comprises first and second spaced apart plates, and includes a pressure transfer passage having a lower end in fluid communication with the operational PWR volume and an upper end in fluid communication with the internal pressurizer volume at a level below an operational pressurizer liquid level range. A vent pipe has a lower end in fluid communication with the operational PWR volume and an upper end in fluid communication with the internal pressurizer volume at a level above the operational pressurizer liquid level range.
Abstract:
A thermal sleeve is mechanically attached to the bore of a surge nozzle of a pressurizer for the primary circuit of a pressurized water reactor steam generating system. The thermal sleeve is attached with a series of keys and slots which maintain the thermal sleeve centered in the nozzle while permitting thermal growth and restricting flow between the sleeve and the interior wall of the nozzle.
Abstract:
Eine Sicherheitseinrichtung (2) zur Überdruckabsicherung eines druckführenden Systems, insbesondere eines Druckbehälters (4) einer kerntechnischen Anlage, mit einer Sicherheitsarmatur (6) soll derart beschaffen sein, dass die Sicherheitsarmatur (6) sowohl bei Erreichen eines kritischen Systemsdrucks mit hoher Zuverlässigkeit öffnet und eine Druckentlastung des druckführenden Systems ermöglicht, als auch nach erfolgtem Druckabbau auf einen vorgegebenen Wert wieder besonders zuverlässig schließt. Erfindungsgemäß weist dazu die Sicherheitsarmatur (6) zwei hintereinander in einem Strömungskanal (10) angeordnete Sicherheitsventile (12, 48) auf, wobei jedes der Sicherheitsventile (12, 48) ansteuerseitig über eine Steuerleitung (38, 70) in Verbindung mit einer ihm zugeordneten, impulsseitig über eine Druckentnahmeleitung (42, 74) mit dem druckführenden System verbundenen Steuereinrichtung (40, 72) steht, welche nach dem Ruheprinzip arbeitet.
Abstract:
Device for removing a heating rod (3) form a pressurizer tank (4). The device is characterized in that it comprises at least one pair of drive wheels (9a); drive means (11, 12, 13) for rotating at least one of the wheels (9a); means (10) for closing said pair of wheels (9a) onto the rod (3) to be removed. Said means (10) press the wheels (9a) against the rod (3) to be removed while allowing radial shifting of the wheels (9a) in relation to the axis of removal, the wheels (9a) thereby matching the deformed portions of the rod.