CN108735062A - A kind of reactor coolant pump kingbolt stretching simulator - Google Patents

Abstract

The invention belongs to the technical field of nuclear power engineering in nuclear power plants, and in particular relates to a tension simulation device for a main bolt of a reactor coolant pump. The invention includes a bottom plate, a fixing nut, a main flange simulation part, a gasket barrel, a butterfly gasket, a lower spherical gasket, an upper spherical gasket, a nut, a main bolt, the fixing nut is fixedly connected to the bottom plate, and the bottom plate is fixed to the ground; The main bolt is screwed into the fixed nut; the main flange simulation part is inserted into the main bolt; the gasket barrel is inserted into the main bolt; several pieces of butterfly gaskets are inserted into the main bolt and installed in the gasket barrel; the lower spherical gasket sleeve After inserting the main bolt, install it on the top of the butterfly washer; place the upper spherical washer on the lower spherical washer, rotate and move it to make it evenly fit in all directions; the nut is screwed into the top of the main bolt. The invention can simulate the actual working condition of the main bolt of the reactor coolant pump, and cooperate with the bolt stretching machine to achieve the simulated operation of tightening the main bolt.

Description

A reactor coolant pump main bolt tensile simulation device

technical field

The invention belongs to the technical field of nuclear power engineering in nuclear power plants, and in particular relates to a tension simulation device for a main bolt of a reactor coolant pump.

Background technique

In the dismantling and overhaul of the nuclear reactor coolant pump, a relatively basic and very important maintenance procedure will be involved, which is to tighten the 30 main bolts evenly distributed on the main joint surface of the nuclear reactor coolant pump. In the tightening process, the hydraulic pump station is used to cooperate with the bolt tensioning machine, and the tightening is carried out by stretching the main bolt. According to the technical requirements, the specified stretching amount and specified torque can be counted as the completion of the tightening work. Before the dismantling and overhaul, the general nuclear reactor coolant pump area is in a closed state, which makes it impossible to see the real thing for operation before the disintegration and overhaul of the nuclear reactor coolant pump. The traditional pre-overhaul training work is generally explained in the form of videos and pictures, which is not intuitive enough. . After the training is completed, maintenance personnel often need to re-learn and adapt during the actual overhaul, which reduces work efficiency, increases maintenance time and collective dose, and also increases safety risks due to unskilled operation, which is not conducive to the requirements of safe production.

Contents of the invention

The technical problem that the present invention solves:

The invention provides a main bolt stretching simulation device of a reactor coolant pump, which can simulate the actual working condition of the main bolt of the reactor coolant pump, and cooperate with a bolt stretching machine to achieve the simulation operation of tightening the main bolt.

The technical scheme adopted in the present invention:

A reactor coolant pump main bolt simulation device, including a bottom plate, a fixed nut, a main flange simulation piece, a gasket barrel, a butterfly gasket, a lower spherical gasket, an upper spherical gasket, a nut, a main bolt, a fixed nut and The bottom plate is fixedly connected, and the bottom plate is fixed to the ground; the main bolt is screwed into the fixing nut; the main flange simulation part is inserted into the main bolt; the gasket barrel is inserted into the main bolt; several butterfly gaskets are inserted into the main bolt and then installed on the gasket Put the lower spherical gasket into the main bolt and install it on the top of the butterfly gasket; place the upper spherical gasket on the lower spherical gasket, rotate and move to make it evenly fit in all directions; screw the nut into the main bolt top.

Make sure the top layer of the retaining nut is level.

Adjust the horizontal position of the main flange dummy so that it is concentric with the fixing nut.

Adjust the horizontal position of the gasket barrel so that it is concentric with the main flange dummy.

The fixed nut, the main flange simulation part and the gasket barrel are made of stainless steel rods as raw materials; the lower spherical gasket and the upper spherical gasket are made of hard stainless steel, and the nuts are processed by stainless steel cylindrical parts.

Beneficial effects of the present invention:

(1) A reactor coolant pump main bolt stretching simulation device provided by the present invention can simulate the main bolt structure under the actual working conditions on site; it can simulate the on-site main bolt stretching and tightening process;

(2) A reactor coolant pump main bolt tensioning simulation device provided by the present invention has a simple structure, is easy to process and low in cost, has a high degree of similarity with the position and structure of the main bolt in actual working conditions, and has a high degree of simulation in cooperation with a bolt tensioning machine , to facilitate the development of pre-overhaul training, thereby effectively improving the skill proficiency of maintenance personnel during overhaul, reducing operational safety risks, improving work efficiency, and reducing collective dose values.

Description of drawings

Fig. 1 is the front view of a kind of reactor coolant pump main bolt simulation device provided by the present invention;

In the figure: 1-bottom plate, 2-fixing nut, 3-main flange simulation part, 4-gasket barrel, 5-butterfly gasket, 6-lower spherical gasket, 7-upper spherical gasket, 8-nut , 9-main bolts.

Detailed ways

A reactor coolant pump main bolt simulation device provided by the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

As shown in Figure 1, a reactor coolant pump main bolt simulation device provided by the present invention includes a bottom plate 1, a fixing nut 2, a main flange simulation part 3, a gasket barrel 4, a butterfly gasket 5, and a lower spherical gasket Sheet 6, upper spherical gasket 7, nut 8, main bolt 9, fixing nut 2 is welded to the bottom plate 1, the bottom plate 1 is fixed to the ground through 4 expansion bolts, and the top layer of the fixing nut 2 is guaranteed to be level; the main bolt 9 is screwed in In the fixed nut 2; insert the main flange simulation part 3 into the main bolt 9, adjust the horizontal position of the main flange simulation part 3 so that it is concentric with the fixed nut 2; insert the gasket barrel 4 into the main bolt 9, and adjust the gasket barrel 4 The horizontal position makes it concentric with the main flange simulation part 3; insert 38 butterfly gaskets 5 into the main bolts 9 and install them in the gasket barrel 4; insert the lower spherical gasket 6 into the main bolts 9 and install them on the The top of the butterfly washer 5; place the upper spherical washer 7 on the lower spherical washer 6, rotate and move to make it evenly fit in all directions; screw the nut 8 into the top of the main bolt 9.

The fixed nut 2, the main flange simulation part 3, and the gasket barrel 4 are made of stainless steel rods as raw materials; the lower spherical gasket 6 and the upper spherical gasket 7 are made of hard stainless steel, and the nut 8 is processed by stainless steel cylindrical parts.

Claims (5)

1. a kind of reactor coolant pump kingbolt simulator, it is characterised in that：Including bottom plate (1), fixing nut (2), master Flange simulating piece (3), gasket bucket (4), butterfly gasket (5), lower spherical washer (6), upper spherical washer (7), nut (8), main spiral shell Bolt (9), fixing nut (2) are fixedly connected with bottom plate (1), and bottom plate (1) is fixed with ground；Kingbolt (9) screws in fixing nut (2) In；Main flange simulating piece (3) is inserted in kingbolt (9)；Gasket bucket (4) is inserted in kingbolt (9)；If dry plate butterfly gasket (5) covers Enter kingbolt (9) to be installed afterwards into gasket bucket (4)；Lower spherical washer (6) is inserted in kingbolt (9) and is installed afterwards to butterfly gasket (5) Top；Upper spherical washer (7) is placed in lower spherical washer (6), rotates and movement is allowed to all directions uniformly and is bonded；Nut (8) it screws at the top of kingbolt (9).

2. a kind of reactor coolant pump kingbolt simulator according to claim 1, it is characterised in that：Ensure to fix The top layer of nut (2) is horizontal.

3. a kind of reactor coolant pump kingbolt simulator according to claim 1, it is characterised in that：Adjust main method Blue simulating piece (3) horizontal position so that it is concentric with fixing nut (2).

4. a kind of reactor coolant pump kingbolt simulator according to claim 1, it is characterised in that：Adjust pad Bucket (4) horizontal position so that it is concentric with main flange simulating piece (3).

5. a kind of reactor coolant pump kingbolt simulator according to any one of claim 1-4, feature It is：The fixing nut (2), main flange simulating piece (3), gasket bucket (4) are using stainless steel bar as raw material；Lower ball pad Piece (6), upper spherical washer (7) use hard stainless steel material, nut (8) to be process using stainless steel column.