SU687220A1 - Reinforced of high-pressure case - Google Patents

Description

one

This invention relates to high pressure housings for nuclear power plant reactors.

High pressure reinforced concrete casings are known, containing an internal heat insulating layer of blocks arranged in rows and a steel lining 1 j 2.

Steel, facing these casings, undergoes significant stress temperatures, which requires the use of expensive hard-to-weld high-strength steels, which, in addition, do not possess the necessary ductile properties for redistributing the stresses in their concentration zones.

The purpose of the invention is a uniform distribution of stresses in the steel cladding.

To do this, in the proposed high-pressure housing containing an internal heat-insulating layer of blocks arranged in rows and a steel lining, the heat-insulating layer is made of blocks with a curved concave surface, one of which is in the center with a lining and the others are located in adjacent

with them in rows along the height or along the height and perimeter of the hull, a variable gap is formed with the cladding, the gap being determined by the formula:

f -bL (l + CosfCos),

where f is the size of the gap in the span between the points of contact;

fj, is the maximum gap in the center of the span between the points of contact;

X and Yy are the current coordinates of the point at which the gap is defined;

a and b are half the distance between the points of contact of the lining, respectively, on the axis X and Y.

FIG. 1 shows the described housing, a section along the axis; in fig. 2 - the same cross section.

Claims (2)

Reinforced concrete body 1 consists of a heat-insulating layer made of blocks-liner 2 and castle 3, as well as steel cladding 4. Block liners 2 have two pairs of mutually parallel side surfaces and a maximum height in the center of the block, and castle blocks 3 have one pair of mutually parallel side surfaces and a minimum height in the center of the block. From the side facing the lining, the surface of the blocks is curved and concave. Blocks 2 and 3 are attached to housing 1, for example with mounting studs and retaining nuts. For this, through holes can be made in blocks. Steel cladding 4 at the points of contact with the block of inserts 2 can be fastened both directly to them and through a system of fasteners to the bearing housing 1. Blocks 2 and 3 can be made of heat-resistant claydite-concrete or corundum. If it is necessary to increase the reliability of the nuclear reactor case, an additional sealing lining can be installed between the blocks 2 and 3 of the heat insulating layer and the supporting case 1. In the process of loading the high-pressure body with internal overpressure and temperature, the steel cladding 4 alternately undergoes two operating modes, starting and operating. In the start-up mode, due to the gap 5, the steel cladding 4 can move towards the blocks 2 and 3 of the heat insulating layer, while the determining load for it is the overpressure causing tensile membrane stresses in the steel cladding, the values of which are determined by the gap between facing and blocks of the heat-insulating layer. At the end of the starting mode, the steel lining fits snugly to the blocks of the heat insulating layer. In the operating mode, in steel cladding from the action of operating loads — operating overpressure and operating temperature — additional tensile stresses arise due to the flexibility of the material of the blocks of the heat insulating layer, as well as significant compressive temperature stresses. The sum of the stress-strain states of the steel cladding of the starting and operating modes determines the stress field in the steel cladding during the operation of the nuclear reactor at operating temperatures and pressures, the values of which should not exceed the allowable values. In emergency mode, when the overpressure is zero and the casing remains hot, the variable gap allows temperature compensation of the casing due to the loss of stability of the steel facing. The curvilinear concave surface of the blocks of the heat insulating layer makes it possible to clearly repeat the shape of the deformed steel lining. This will cause in the last field tensile stresses, the magnitude of which will not exceed the values of permissible stresses in any section of the cladding, which guarantees its reliable operation. In addition, such a constructive implementation of a high pressure reinforced concrete body allows to simplify its manufacture. Claims of the invention A high pressure reinforced concrete casing containing an internal heat insulating layer of blocks arranged in rows and a steel lining, characterized in that, in order to evenly distribute stresses in the steel facing, the heat insulating layer is made of blocks with a curved concave surface, some of which are in the center contact with the lining, while others placed in the village adjacent to them in height or height and perimeter of the body, form a variable gap with the lining, and the gap size is about formsch1e thinned out by: I - (1 + Cos i | -Soz) wherein f - amount of clearance, in the span between the contact points; fo - the maximum gap in the center of the span between the points of contact; xy - the current coordinates of the point at which the gap is defined; a and 8 are half the distance between the points of contact of the lining, respectively, along the axes "X and" Y. Sources of information taken into account in the examination 1. UK Patent N ° 1447563, CLT2 X, publ. 1976. 2. For registration No. 2486628 / 29-33, cl. E 04 H 7/00, 11.05.77, on which the decision to issue an author's certificate was made.