RU123205U1 - REACTOR HOUSING - Google Patents

Abstract

The reactor vessel, consisting of a flange with threaded holes connected by welded circular seams, the upper shell of the branch zone, the lower shell of the branch zone, the shell of the core and an elliptical bottom, characterized in that the shell of the core is made in the form of one monolithic elongated shell with a support shoulder in the upper parts.

Description

The utility model relates to nuclear engineering, in particular, to the structural elements of high pressure tanks, and can be used in the manufacture of the body of a nuclear power reactor of water-water type (WWER) for nuclear power plants.

The nuclear reactor casing is known from the prior art, including an upper flange connected by ring welds for connection with a reactor lid, an upper shell with welded nozzles for connecting to external pipelines, two shells of the reactor core and a convex bottom consisting of a cylindrical part in the form of a ring provided bottom annular emphasis with a cone connected by an annular weld seam with a spherical bottom element (patent US 4,892,702, G21C 13/08, G21C 21/00, publ. 09.01.1990).

A nuclear reactor casing is known, including a top flange connected by ring welds for connection with a reactor lid, two shells with forged pipes for connection to external pipelines, two shells of the reactor core, a support conical skirt and a convex bottom, welded to it, are welded to the bottom parts in the form of a ring connected by an annular weld seam with a spherical element of the bottom (patent US 6,426,986, G21C 13/02, publ. 30.07.2002).

The closest in technical essence and the achieved technical result and adopted as a prototype of the claimed utility model is the VVER-1000 nuclear reactor casing, made in the form of a vertical cylinder, consisting of annular welded top flange for connection to the reactor lid, two shells with stamped nozzles for connecting with external pipelines, two shells of the reactor core and an elliptical bottom, (see I.Ya. Emelyanov, V.I. Mikhan, V.I. Solonin, R.S. Demeshev, N.F. Rekshnia, " TO construction of nuclear reactors ”, M., Energoizdat, 1982, pp. 76-79).

A common drawback for the nuclear reactor shells mentioned above is the presence in the zone of the greatest neutron irradiation of the ring weld connecting the two cylindrical shells of the reactor core, which significantly reduces the reliability of the design.

The task to which the claimed utility model is directed is to increase the operational reliability of the reactor, reduce the cost of manufacturing the reactor vessel and reduce the metal consumption of the vessel.

The problem is solved by manufacturing a cylindrical part of the reactor vessel in the region of the active zone in the form of one monolithic elongated shell, which excludes from the design of the reactor vessel the ring weld most exposed to neutron radiation.

The figure 1 shows a longitudinal section of a General view of the reactor vessel.

The reactor vessel is made in the form of a welded structure consisting of a flange 1 with threaded holes for the studs on which the cover is attached, the upper shell 2 of the pipe zone, the lower shell 3 of the pipe zone, the elongated shell 4 of the active zone 7 and the elliptical bottom 5.

For the manufacture of the main parts of the reactor vessel, mainly Cr-Mo-V and Cr-Ni-Mo-V compositions of the type 15X2MFA and 15X2NMFA (15X3NMFA) are used. Flange 1 is made of an ingot forged and rolled. The upper and lower shells of the 2 and 3 pipe zones are made integral without welds from the ingot by forging, rolling into a cylinder, followed by stamping of the pipes. The elongated shell 4 of the active zone 7 is made whole from an ingot weighing 290-335 tons by extruding the center of the ingot, followed by rolling. The manufacture of an elongated and monolithic core shell makes it possible to exclude from the design of the reactor vessel the most vulnerable to a neutron irradiation ring weld, which increases the reliability and operational safety of the reactor. The elliptical bottom 5 is made integral from the ingot by forging and subsequent stamping.

After manufacturing the structural elements of the reactor vessel, they are machined with the preparation of the edges for welding. In this case, when machining the outer cylindrical surface of the elongated shell 4 in its upper part, a support shoulder 6 is formed (machined) to position the reactor vessel. Then, the main elements are welded with annular seams for the final formation of the reactor vessel.

The manufacture of the main elements of the reactor vessel integral without welds allows to reduce the metal consumption of the vessel and reduce the cost of its manufacture.

Claims (1)

The reactor vessel, consisting of flange with threaded holes connected by welded ring seams, the upper shell of the pipe zone, the lower shell of the pipe zone, the shell of the active zone and elliptical bottom, characterized in that the shell of the active zone is made in the form of one monolithic elongated shell with a supporting collar in the upper parts.