JPS5987391A - Spherical steel container of reactor facility - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to the use of steel for nuclear reactor equipment that is placed on a concrete foundation, is partially left standing, has a concrete internal structure, and is penetrated by a conduit. a spherical containment vessel, the containment vessel being connected to the concrete by an anchoring element oriented at right angles to the surface of the containment vessel, the anchoring element being flexible over a portion of its length in the vicinity of the containment vessel; In the case of the containment vessel known from JP-A-52-63589, in which the steel balls are spaced from the concrete by a solid packing material, a rod-shaped anchor element is guided through the entire concrete. , are tightened by plates installed on the outside of the concrete on both the inside and outside of the containment vessel. As a result, the holding force that prevents the internal structure of the concrete IJ and the containment vessel from shifting during an earthquake, and prevents the conduit penetrating the containment vessel from breaking and straining, is created by the concrete layer on both the inside and outside of the containment vessel. communicated by the whole.

Therefore, the anchor element becomes thick. this is,
The desired 500 Mp pretightness at each tightening point is very large for the force.

The object of the invention is to create a mooring system which allows the forces to be taken into account easily, ie over short distances. According to the invention, this object is achieved in that the anchoring element is oriented at right angles to the surface of the spherical containment only in a meridian plane passing through the upper and lower poles of the spherical containment and is inside the concrete.

According to the invention, the anchoring element serves as a "loose reinforcement" which only acts in the case of strong lateral loads.

On the other hand, when the containment vessel is inflated, no restraint occurs, for example, in the case of internal pressure experiments for airtightness tests of the containment vessel. This is because the spherical containment vessel extends upward uniformly when viewed from below.
That is, the flexible packing material allows for free movement when extending in the direction of the meridian plane running through the lower frame and the upper pole. On the other hand, when a lateral force occurs, as in the case of an earthquake, the part of the anchoring element that emanates from the meridian plane, i.e. runs transversely to the meridian plane, acts as a retaining element and holds the conduit and containment vessel together. damage is prevented because the alignment is maintained. It is then sufficient for the anchoring element to be long enough to introduce a force into the concrete. Generally, the length may be 1 m or less. Furthermore, moorings in concrete can be easily formed.

The concrete foundation and the containment vessel of the concrete internal structure were completely removed.

Furnace using a rod as an anchoring element, the extent of which is inclined transversely to the meridian plane; The rods are then tilted alternately opposite each other in order to obtain a uniform stress. Therefore, the rod riIF, 3'"P-Hiro is similar to the hunting side fence. The angle of inclination is 30° ~ 60°, favorable - ÷
The angle is 45°.

As the anchoring element it is also possible to use a steel plate oriented in four directions relative to the meridian plane and having a length at least ten times the wall thickness. This steel plate can form a skirt body running along the latitudinal diameter of the sphere, that is to say an annular body, so to speak, arranged next to each other without any spacing.

In this case, it is advantageous if the skirt body is locally thinned in the region of the flexible packing material in order to form elastic joints that facilitate deformation during internal pressure loading tests. This thin section extends over two concentric impaction walls. This thin part is approximately 50 mm thicker than the copper plate.
% plate thickness. In any case, the transition to normal plate thickness must be appropriately rounded. Furthermore, the "mobility" of the skirt body is improved by the fact that the angle of the skirt body in the meridian plane on the side of the lower frame is 1 to 3 degrees greater than 90 degrees.

The steel plate has a notch in the area of the weld seam of the spherical containment vessel in order to ensure that the tightness of the weld seam of the spherical containment vessel is not affected by the installation of the steel plate. Preferably, steel plates or bars are placed in alignment on both the inner and outer sides of the spherical containment vessel, thereby providing retention between the concrete of the internal structure and the foundation with minimal expected stresses in the containment vessel itself.

With regard to tightness, it is advantageous if the steel plate or rod is made of a ductile material. The steel plates must be welded together with one seam.

The end of the anchor element remote from the spherical containment is advantageously provided with a fitting for interlocking connection with the reinforcing steel. Therefore, the accessory should preferably be a bath-welded steel plate with holes for inserting reinforcing rods. In the area where the hole is provided, the anchor cord is loaded only in tension and not in bending.
It is made "flexible" by the cutout so that only correspondingly such tensile forces are applied to the containment vessel.

The notch in the coffin is used to pass additional reinforcing bars that run through the coffin.

In the case of a reactor installation with a pressurized water expansion reactor (#i), if a vertical concrete cylinder used as a so-called projectile protection cylinder is placed inside a spherical containment vessel, the anchoring element is attached to the concrete cylinder. Advantageously, the anchoring elements are arranged in two concentric rows in such a way that they are connected to the vertical reinforcing bars on the outside and on the inside.

The present invention will be described in detail below based on embodiments shown in the drawings.

The reactor equipment in FIG. 1 is surrounded by a secondary shield 2 made of steel and concrete as a containment vessel. The steel ball 1 is connected to the concrete base through about one-third of its circumference in a vertical cross section? It is placed on top of &'3. This foundation 3 is integrally formed with the foundation 6 of the secondary shield 2 via a central region 7 and a ring-shaped wall 16. Between the concrete foundation 3 and the vertical wall 4 of the secondary shielding body 2 there is an intermediate chamber 5 of approximately triangular cross-section that can be used to accommodate auxiliary equipment.

Inside the containment vessel l, there are a reactor pressure vessel 8 and a plurality of reactor pressure vessels connected to the reactor pressure vessel 8 via conduits 10, as main components of a pressurized water expansion reactor equipment with a thermal output of 3800 MW, for example. A steam generator 9 is arranged. The system of conduits 10 includes a main coolant pump (not shown).

The components of the so-called - next system are thick concrete walls 17
It is surrounded by. The outer boundary of this enclosure is a so-called missile protection cylinder 11, which protects the containment vessel l by trapping debris that could fly off in the event of an accident.

Flying body protection cylinder 1] on the soil (I: 1 rotating crane 1
2 is placed. The chamber 13 between the fly-proof vagina/oil body 1.1 and the surrounding seal *:tn宕2;''1 is used to house other auxiliary equipment. Starting from the steam generator 9 The steam conduit 15 penetrates the containment volume i5-1 near the equator of the spherical containment vessel 1, and is guided in a straight line through the secondary shield 2.

The containment vessel l is supported by concrete via approximately one-third of the circumference of its lower cross-section, which concrete includes a concrete foundation 3, a ring-shaped wall] 6 and this ring-shaped wall 1.
It consists of an outer concrete spherical body 18 supported by 6. The spherical body 18 is the inner concrete spherical body 1.
9, this inner concrete spherical body 19
is the basis for all other concrete interior walls 11.17. The two spherical bodies 18 , 1 . It is in contact with the containment vessel at right angles to the spherical surface on the 1'+ plane passing through it.

According to the invention, the anchoring element can be oriented radially in contrast to known constructions. Rather, the attachment of the anchoring element to the spherical containment vessel 1 is spread out transversely to its meridian plane, which is defined by points, so that the anchoring element projects beyond this plane. This can be seen from the fact that in the embodiment, one conical steel plate skirt body 25, 26 is provided as an anchor element on each of the inner and outer sides of the spherical containment vessel 1. These skirt bodies 2
5.26 are welded in line at weld seams 28.29, so that the anchors are straight in the cross-sectional view of FIG.

Skirt body 25.26 is a thick steel containment vessel l of 38 cabinets.
Unlike the original, it has a wall thickness of 15 mIn and a length of about 500 mIn. In that case, the part adjacent to containment vessel 1 is 30
The flexible packing 30 over a length of 0 Mn is made of expanded polystyrene, which is held together by a thick sheet metal 31 of, for example, four layers to the concrete. Storage container l of the lower skirt body 25
A hole is provided near the hole, through which a tube 33, whose end 34 is flared, runs. This tube 33 is a sheet metal 3
1 is fixed. This tube 33 also forms an air vent, which prevents cavities from forming on the underside of the skirt body 25 when pouring the concrete 1.

The angle W that opens downward between the skirt body 25, 26 and the containment vessel 1, that is, the angle W on the lower pole 23 side, is such that the amount of deformation V of the containment vessel 1 in the direction of the arrow 35 is 2O.
rto, and the length L of the packing is 300 rmn, it is wider than 90° by a spoon Sln"4. Therefore, this angle W is 90 + 1.9 = 91.9°.

Tensile loads on the skirt body 25, 26 are thereby avoided in this case.

This can advantageously be improved by two concentric annular regions 39, 4.4 shown in broken lines on the skirt body 25.

In these annular regions 39, 44 the plates are thinned to 8Mn, ie by approximately 50%, thereby forming an elastic-plastic joint.

At the free end of the skirt body 25, 26 there is a triangular prismatic steel 36.
．． 37 are welded, and these are made by melt-cutting a thick plate with a thickness of 80 rpm and having an inclined surface on the side of the skirt body. The prismatic steel 36,37 has a vertically oriented through hole 38 with a diameter of 54 mm for receiving a reinforcing bar 40 with a diameter of 50 mm. The prismatic steel 36.37 is fixed with an oval (41.42) onto the end screw 43 of the metric thread M2O.

As can be seen from FIG. 3, the steel plate of the skirt body 25 has a weld seam 4 of the spherical containment vessel 1 assembled and welded from steel plates.
A notch 47 is provided in the range of 5. This ensures that the welded seams 45 and 28 are not harmed by the heating during the making, and α5) 40 - reinforcing bars, 45... welded seams, 47... notches.

This is guaranteed.

As can still be seen in FIG. 3, the prismatic steel bars 36, 37 are welded between the slits 50 provided in the core body 25. Inside the slit 50, there is a reinforcing bar 51 running horizontally with a diameter of 28 mm, so there is a reinforcing bar 4 running vertically from the skirt body 25.
A short connection is reached for the transmission of forces emerging through 0, which are transmitted to the concrete 18 by means of reinforcing bars 51.

[Brief explanation of the drawing]

FIG. 1 is a vertical sectional view of the main part of the present invention in a nuclear reactor facility having a pressurized water expansion reactor, and FIGS. 2 and 3 are enlarged detailed views of the mooring portion with concrete reinforcing bars. 1... Formula-shaped containment vessel, 18.19... Concrete spherical body, 20... Anchor element, 22.
・Upper pole of the sphere, 23...Lower pole of the sphere, 25.26
...Skirt body, 28.29...K-g eyes,
30...Packing material, 36.37...Prismatic steel,
38...hole, (2)

Claims (1)

[Claims] 1) Steel for nuclear reactor equipment that is partially placed on a concrete foundation and partially left standing, has a concrete internal structure, and is penetrated by a conduit. a spherical containment vessel, the containment vessel being connected to the concrete by an anchoring element oriented at right angles to the surface of the containment vessel, the anchoring element being flexible over a portion of its length in the vicinity of the containment vessel; In a steel spherical containment vessel spaced from the concrete by a solid packing material, anchoring elements (25, 26) are attached to the upper pole (22) and lower pole (23) of the spherical containment vessel (1). ) is oriented at right angles to its surface only in the meridian plane passing through the conch! J-) A steel spherical containment vessel for nuclear reactor equipment, characterized in that it is laterally expanded in the interior of (18, 19') in a direction opposite to this meridian plane. 2) Containment vessel according to claim 1, characterized in that the anchoring element (20) is a bar inclined laterally at l~ to the meridian plane. 3) Containment vessel according to claim 2l, characterized in that the rods (20) are inclined in alternating directions. 4) The containment vessel according to claim 2 or 3, characterized in that the angle of inclination is 30° to 60°, preferably 45°. 5) Claim 1, characterized in that the anchoring element is a steel plate (25, 26) oriented transversely to the meridian plane and having a length at least 10 times its wall thickness. Containment vessel as described in section. 6) Containment vessel with a fifth section as claimed in the patent claim, characterized in that the steel plates form a skirt body (25, 26) running around the latitudinal diameter of the spherical containment vessel. 7) The skirt body (25, 26) is made of flexible packing material (
Claim 6, characterized in that in the region 30), preferably two annular regions running around the spherical containment vessel are thinned to the extent that they form an elastic-plastic joint. containment vessel. 8) The containment vessel according to claim 7, wherein the thin wall portion has a thickness that is approximately 50% of the thickness of the steel plate, and the transition portion thereof is rounded. 9) Claims 6 to 8 characterized in that the angle of the lower pole (23) of the skirt body (25° 26) in the meridian plane is 1 to 3° larger than 90'. Containment vessel described in any of the above. 10) Claims 5 to 9, characterized in that the steel plates (25, 26) have a notch (47) in the area of the welded seam (45) of the spherical containment vessel (1). 11) Claims 5 to 10, characterized in that the steel plates (25, 26) are arranged in a straight line on both the inside and outside of the spherical containment vessel (1).
Containment vessel described in any of paragraphs. 12) according to any one of claims 5 to 11, characterized in that the steel plates (25, 26) consist of a ductile phase material and are welded with K-seams (28, 29); Containment vessel. 13) Spherical containment vessel (1) for anchor elements (25, 26)
), the end remote from the reinforcing bar (40) has an attachment (36, 37) for an interlocking connection with the reinforcing bar (40). Containment vessel as described. 14) The containment vessel according to claim 13, characterized in that the accessories (36, 37) are welded steel plates with holes (38) for passing reinforcing bars (40). 15) Spherical case Il: In a containment vessel in which a concrete cylinder is arranged vertically inside the vessel, the anchoring element is connected to vertical reinforcing bars on the outside and inside of the concrete cylinder (11). 15. The storage container according to claim 1, wherein the containers are arranged in a row on two concentric circles.