CN211264975U

CN211264975U - CVS lets out heat exchanger shielding strutting arrangement down

Info

Publication number: CN211264975U
Application number: CN201922152580.7U
Authority: CN
Inventors: 何李源; 王吉; 牛朝辉
Original assignee: Sanmen Nuclear Power Co Ltd
Current assignee: Sanmen Nuclear Power Co Ltd
Priority date: 2019-12-05
Filing date: 2019-12-05
Publication date: 2020-08-14
Anticipated expiration: 2029-12-05

Abstract

The utility model relates to a radiation protection field, concretely relates to CVS lets out heat exchanger's shielding strutting arrangement down, enclose the interior bounding wall in the many blocks of the outer shielding main part of heat exchanger under the CVS including forming, the upper end of interior bounding wall and lower tip are provided with surrounding edge and surrounding edge down respectively, and are in two sides of interior bounding wall are provided with the side respectively and follow, it all is provided with the limit hole on following to go up surrounding edge, surrounding edge down and side, and is adjacent can dismantle the connection through retaining member and limit hole between the interior bounding wall, the side of interior bounding wall is followed to another side and is extended the extension edge, extend along, incline along, enclose into the slot between the bounding wall, through the slot can be dismantled and ann has been inserted the peripheral board. The utility model can be conveniently mounted and dismounted according to actual needs; the choice of whether to add peripheral plates can be made according to the radiation size.

Description

CVS lets out heat exchanger shielding strutting arrangement down

Technical Field

The utility model relates to a radiation protection field, concretely relates to CVS lets out heat exchanger's shielding strutting arrangement down.

Background

The CVS of the nuclear power station needs to be maintained regularly or overhauled due to faults in the running process, and radiation shielding is an effective method for reducing external irradiation of personnel in consideration of radiation protection of maintainers.

Radiation shielding principle: the shielding principle of gamma rays. Gamma photons are attenuated or absorbed when passing through the shield by transferring energy to the shield primarily through the processes of photoelectric effect, compton scattering, and electron pair formation. The photoelectric effect is that photons transfer all energy to orbital electrons, which are released from the shell and released from atoms, which plays a major role in the absorption of low-energy gamma photons (gamma photons with energies less than several hundred keV). Compton scattering is the collision of a photon with a free electron, transferring part of the energy to the electron, while changing its direction and energy, and plays a major role in reducing the energy of the intermediate-energy gamma photons (with energies between hundreds of keV and several MeV). The formation of electron pairs is the interaction of gamma photons with the electric field of the nucleus, the gamma photons are completely annihilated, the energy of the gamma photons is converted into the mass and the kinetic energy of a pair of positive and negative electrons and the kinetic energy of recoil nucleus, and the absorption of high-energy gamma photons (the energy is more than a few MeV) plays a main role.

Commonly used shields typically have the following characteristics: the density is high, and rays can be effectively absorbed; ② has enough mechanical strength, mechanical stability, thermal stability and chemical stability; thirdly, the price is low, and the processing and the construction are easy. These requirements can only be met by using several materials in combination. The shielding materials commonly used in nuclear power plants are steel, water and concrete (including concrete containing crystal water or boron heavy metal aggregate), and lead or boron-containing plastics are also selected in local places.

However, at present, a shielding body aiming at the CVS heat sink is not available, so that the shielding and supporting device of the CVS heat sink is required to be invented to reduce the radiation level of a working area where maintenance personnel are located.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to overcome prior art's not enough, provide a CVS lets out heat exchanger shielding strutting arrangement down, convenient dismantlement installation.

The technical scheme of the utility model

The utility model provides a CVS heat exchanger shielding strutting arrangement that lets out down, is including forming around the outer shielding main part's of CVS heat exchanger that lets out multiblock inside coaming down, the upper end of inside coaming and lower tip are provided with surrounding edge and surrounding edge down respectively, and two sides of inside coaming are provided with the side respectively and are followed, go up surrounding edge, surrounding edge and side edge down and all be provided with the limit hole, it is adjacent can dismantle the connection through retaining member and limit hole between the inside coaming, the side of inside coaming is followed to another side and is extended along the direction and follow, extend along, the side, enclose into the slot between the coaming, through the slot can be dismantled and has been inserted the surrounding plate.

Above-mentioned technical scheme through the connected mode of dismantling between the bounding wall in the polylith, realizes shielding main part's installation and dismantlement, simultaneously, through setting up the slot with the help of the side edge, can increase or remove the bounding wall according to radiation dose.

Preferably, the inside boarding is 2-5 pieces.

Still more preferably, the inside boarding is 3 pieces.

Preferably, the side edges are disposed outwardly of the shroud.

Preferably, the peripheral plate is a lead enclosing plate.

Preferably, the inside boarding is made of steel.

Preferably, the extension length of the extension edge is at least 8cm, and the mounting and fixing effects on the outer enclosing plate are better.

Preferably, the thickness of the inner surrounding plate is 12-15 mm. The 80% radiation dose of the nuclear power plant is caused by Co-60 and Co-58 nuclides, wherein the Co-60 accounts for over 80%, and the radiation energy of the Co-60 nuclides is 1.17MeV and 1.33 MeV. The thickness of the weakened layer of the steel for the ray of 1.3MeV is 17mm, the thickness of the steel of the invention is 12-15mm of the thickness of the inner surrounding plate, and the ray shielding effect for the ray of 1.3MeV is about 33 percent; namely, the invention can reduce the radiation level of the working area where the maintenance workers on the upper part of the main pump are positioned by about 33 percent.

Further preferably, the thickness of the inner surrounding plate is 10 mm.

Through implementing above-mentioned technical scheme, the utility model has the advantages of as follows:

1. the installation and the disassembly can be convenient according to the actual requirement;

2. the choice of whether to add peripheral plates can be made according to the radiation size.

Drawings

Fig. 1 is a schematic view of an inner surrounding plate of the present invention;

FIG. 2 is a schematic view of the present invention installed in a CVS letdown heat exchanger;

fig. 3 is a schematic view of an inner surrounding plate according to another embodiment of the present invention;

fig. 4 is a top view of an interior panel according to another embodiment of the present invention.

Detailed Description

The technical solution of the present invention will be further described in detail by the following specific examples.

Example 1

A CVS let-down heat exchanger shielding and supporting device is shown in figure 2 and comprises a plurality of inner surrounding plates 10 which form a shielding main body surrounding the CVS let-down heat exchanger 100, the inner surrounding plates 10 are shown in figure 1, the inner surrounding plates 10 are made of steel, the number of the inner surrounding plates 10 is determined according to the size of the exchanger and the volume and weight of each inner surrounding plate 10 which are actually needed, the number of the inner surrounding plates 10 is preferably 3, and the main body of each inner surrounding plate 10 is 600mm in inner diameter, 610mm in outer diameter and 400mm in height. The upper end portion and the lower end portion of the inner enclosing plate 10 respectively extend outwards to form an upper enclosing edge 10A and a lower enclosing edge 10B, the width is 20mm, two side edges of the inner enclosing plate 10 respectively extend outwards to form a side edge 10C, the width is also 20mm, edge holes 101 are formed in the upper enclosing edge 10A, the lower enclosing edge 10B and the side edge 10C, and the diameter of each edge hole 101 is 10 mm. The adjacent inner enclosing plates 10 are detachably connected through locking part screws and side holes 101.

Example 2

A CVS heat exchanger that lets down shields strutting arrangement, including forming around CVS and letting down the outer shielding body's multiunit inner surrounding plate 10 of heat exchanger, inner surrounding plate 10 is as shown in fig. 3, 4, inner surrounding plate 10 uses the steel to make, the number of pieces of inner surrounding plate 10, according to the size of the exchanger and actual need each inner surrounding plate 10 volume weight of volume weight determine, this embodiment is preferred to set up 4, inner surrounding plate 10 body is 600mm of internal diameter, 612mm of external diameter, height 400 mm. The upper end portion and the lower end portion of the inner enclosing plate 10 respectively extend outwards to form an upper enclosing edge 10A and a lower enclosing edge 10B, the width is 20mm, two side edges of the inner enclosing plate 10 respectively extend outwards to form a side edge 10C, the width is also 20mm, edge holes 101 are formed in the upper enclosing edge 10A, the lower enclosing edge 10B and the side edge 10C, and the diameter of each edge hole 101 is 10 mm. The adjacent inner enclosing plates 10 are detachably connected through locking part screws and side holes 101.

In addition, an extension edge 10D extends from the side edge 10C of the inner enclosing plate 10 to the other side edge along the 10C direction, the extension length is 10cm, a slot 20 is defined by the extension edge 10D, the side edge 10C and the inner enclosing plate 10, the outer enclosing plate 30 is detachably inserted through the slot 20, and the outer enclosing plate 30 is made of lead leather.

Claims

1. The utility model provides a CVS heat exchanger shielding strutting arrangement that lets out down, its characterized in that is including forming around the CVS heat exchanger that lets out outer shielding main part's of heat exchanger in multiblock bounding wall down, the upper end of interior bounding wall and lower tip are provided with surrounding edge and surrounding edge down respectively, and two sides of interior bounding wall are provided with the side respectively and follow, it all is provided with the limit hole on following to go up surrounding edge, surrounding edge down and side, and is adjacent carry out through retaining member and limit hole and can dismantle the connection between the interior bounding wall, the side of interior bounding wall is followed to another side and is extended the extension edge, extend along, incline, enclose into the slot between the bounding wall, through the slot can be dismantled to ann and has been inserted the peripheral slab.

2. A CVS letdown heat exchanger shield support assembly as claimed in claim 1, wherein said inside shroud is 2-5 pieces.

3. A CVS letdown heat exchanger shield support assembly as claimed in claim 1 or claim 2, wherein said side edges are disposed outwardly of the shroud.

4. A CVS letdown heat exchanger shield support assembly as claimed in claim 2, wherein said inside shroud is 3 pieces.

5. A CVS letdown heat exchanger shield support assembly as claimed in claim 2, wherein said peripheral plate is a lead shroud.

6. A CVS letdown heat exchanger shield support assembly as claimed in claim 1, wherein said inside shroud is formed of steel.

7. A CVS letdown heat exchanger shield support assembly as claimed in claim 1, wherein said extension is at least 8cm in length.

8. A CVS letdown heat exchanger shield support apparatus as claimed in claim 1, wherein said inner skirt plate has a thickness of 12-15 mm.