摘要:
A SUBSTANTIALLY CYLINDRICAL PRESSURE VESSEL HAS AT LEAST ONE REMOVABLE END STRUCTURE SO AS TO PROVIDE AN OPENING WHICH PRACTICALLY CORRESPONDS IN DIAMETER TO THE INTERIOR OF THE VESSEL. THE REMOVABLE END STRUCTURE COMPRISES FROM THE INTERIOR TO THE EXTERIOR OF THE VESSEL IN THE AXIAL DIRECTION AN OUTWARDLY-FLARED BEARING FACE FORMED ON A CORNICE OF THE INTERNAL VESSEL WALL, A REMOVABLE SLAB TIGHTLY APPLIED AGAINST THE BEARING FACE, A FLARED ABUTMENT FACE FORMED IN THE INTERNAL VESSEL WALL AND AN ASSEMBLY OF WEDGE-SHAPED ELEMENTS EACH OCCUPYING AN ANGULAR SECTOR AND FORCIBLY APPLIED AGAINST THE ABUTMENT FACE. THE REMOVABLE SLAT IS APPLIED AGAINST THE BEARING FACE WITH VARIABLE PRESSURE BY MEANS OF FIRST JACKS MOUNTED BETWEEN THE SLAB AND THE WEDGE ASSEMBLY. THE WEDGE ASSEMBLY IS APPLIED AGAINST THE ABUTMENT FACE EITHER BY MEANS OF SECOND JACKS MOUNTED BETWEEN THE CORNICE AND THE ASSEMBLY OR BY MEANS OF TENSIONED CABLES PASSED THROUGH THE CYLINDER WALL AT RIGHT ANGLES TO THE ABUTMENT FACE.
摘要:
AT LEAST ONE OF THE ENDS OF THE PRESSURE VESSEL IS PIERCED BY AN OPENING DELIMITED BY TWO SUCCESSIVE FRUSTOCONICAL FACES WHICH ARE FLARED TOWARDS THE EXTERIOR. IN ORDER TO CLOSE THE OPENING, A SLAB OR CORRESPONDING SHAPE IS APPLIED AGAINST THE FIRST FACE OR INTERNAL FACE AND A SERIES OF WEDGE-SHAPED ELEMENTS ARE CLAMPED BOTH AGAINST SAID FIRST FACE AND AGAINST THE SECOND FACE OF THE OPENING BY MEANS OF RECTILINEAR CABLES WHICH ARE PASSED RIGHT THROUGH THE WEDGE ELEMENTS AND THE PRESSURE VESSEL WALL. PERIPHERAL PRESTRESSING CABLE SERVE TO COMPLETE THE FORCIBLE APPLICATION OF THE SLAB AND WEDGE ELEMENTS AGAINST THE
VESSEL CYLINDER SO AS TO FORM A TIGHT PRESSURE-RESISTANT ASSEMBLY. NO RELATIVE DISPLACEMENT BETWEEN THE DIFFERENT COMPONENTS NEED BE FEARED AT THE TIME OF APPROACH TO FULL PRESSURE WITHIN THE PRESSURE VESSEL OR DURING OPERATION OF THE REACTOR.
摘要:
In the foundation structure of a reactor containment vessel, a lower foundation plate provided on a ground, an upper foundation plate provided over the lower foundation plate, a base isolation device inserted between the upper foundation plate and the lower foundation plate, and a reactor containment vessel provided on the upper foundation plate are provided. The ends of reverse U-shaped tendons serving as the lower structures of the reactor containment vessel are fixed to the lower surface of the upper foundation plate through the upper foundation plate, which makes it possible to simplify a structure and reduce a construction cost.
摘要:
A nuclear reactor having a pressure vessel which is open at the top. The open top of the pressure vessel is closed by a steel dome. A containment, which is open at the top, extends upward from and is joined to the top of the pressure vessel and has an open containment head at the top thereof. The open top of the containment is closed by a steel dome, thereby forming a containment well bounded laterally by the containment, on the bottom by the vessel closure and on the top by the containment closure. The pressure vessel can be a steel-lined prestressed concrete vessel, while the containment is formed by an extension of the prestressed concrete vessel. Alternatively, the pressure vessel and the containment are parts of a unitary steel vessel. Isolation valves are installed on each penetration pipeline to isolate the system in the event of a loss-of-coolant accident. An isolation valve located external to the pressure vessel and the portion of the pipeline between that external isolation valve and the interior of the pressure vessel are encased in guard piping. The space between the pipeline and the guard piping is pressurized and monitored to detect any leak in either the pipeline or the guard piping.
摘要:
A concrete pressure vessel having a lined cavity for hot, chemically aggressive liquid disposed within a cooling jacket with a layer of material of high thermal conductivity between the cavity liner and the cooling jacket, the jacket and high thermally conductive layer serving to maintain the temperature of the cavity liner within closely controlled limits and the maximum temperature of the main body of the vessel at an acceptable level, and the jacket and the conductive layer also serving to prevent leakage of liquid from the cavity.