CN210623808U

CN210623808U - Tritium-containing helium pipeline suitable for pressurized water reactor environment

Info

Publication number: CN210623808U
Application number: CN201921796070.7U
Authority: CN
Inventors: 张亮; 杨文华; 吴红伟; 孙胜; 童明炎; 李炳林; 斯俊平; 徐斌; 聂良兵; 张帅
Original assignee: Nuclear Power Institute of China
Current assignee: Nuclear Power Institute of China
Priority date: 2019-10-24
Filing date: 2019-10-24
Publication date: 2020-05-26
Anticipated expiration: 2029-10-24

Abstract

The utility model discloses a contain tritium helium pipeline suitable for pressurized water reactor environment, including the outer tube, be located the inner tube of outer tube, fill titanium-based filling layer between outer tube and the inner tube. An object of the utility model is to provide a contain tritium helium pipeline suitable for pressurized water reactor environment to solve the comparatively not enough problem of tritium permeation prevention ability that contains tritium helium pipeline among the prior art, realize reducing the tritium and reveal to the infiltration of pipeline, prevent that the tritium in the helium pipeline from permeating in a large number and revealing into the cooling water, thereby effectively reduce the tritium and reveal the purpose of the radioactive hazard of production.

Description

Tritium-containing helium pipeline suitable for pressurized water reactor environment

Technical Field

The utility model relates to a pressurized water reactor field, concretely relates to contain tritium helium pipeline suitable for pressurized water reactor environment.

Background

The fuel element power jump irradiation test is generally carried out on a research reactor by adopting a special power jump irradiation test device; verification of fuel element performance parameters and safety margins is performed by varying the power of the fuel element in a short time. In order to carry out power jump irradiation tests on pressurized water reactor fuel cells in research reactors, some foreign research reactors, such as the HBWR reactor in norway, the BR2 reactor in belgium, the swedish R2 reactor and the JMTR reactor in japan, use a helium-3 gas circuit as a power regulating device for the fuel cells. By changing the gaseous poisons in the helium shield in the reactor (³He gas), effectively adjusting the irradiation power of the test fuel element.

With helium-3 gas circuits in the core active zone of the research reactor³He gas, which absorbs thermal neutrons in the reactor and produces tritium (a) which is a radioactive hazard³H) In that respect Tritium is an isotope of hydrogen, and has strong penetrating power in a gas state; tritium at a higher temperature can easily permeate a metal material to be made into a container, and then is leaked into the environment. The penetration capacity of tritium increases sharply with increasing temperature.

In a pressurized water reactor environment, the temperature of cooling water outside a helium pipeline reaches 300-330 ℃; helium gas conduits in the active zone portion of the stack and³the heat released by the He gas from the radiation and nuclear reaction will make the temperature of the tritium-containing helium gas higher than the cooling water temperature. Tritium at the temperature level has extremely strong permeability, and because tritium has great radioactive hazard, great pressure is brought to radiation protection and environmental protection of testers. Therefore, the method has extremely high requirements on the tritium permeation leakage prevention capability of the tritium-containing helium pipeline for being applied to the pressurized water reactor environment. Tritium permeation prevention capacity of tritium-containing helium pipelines in the prior art is insufficient.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a contain tritium helium pipeline suitable for pressurized water reactor environment to solve the comparatively not enough problem of tritium permeation prevention ability that contains tritium helium pipeline among the prior art, realize reducing the tritium and reveal to the infiltration of pipeline, prevent that the tritium in the helium pipeline from permeating in a large number and revealing into the cooling water, thereby effectively reduce the tritium and reveal the purpose of the radioactive hazard of production.

The utility model discloses a following technical scheme realizes:

a tritium-containing helium pipeline suitable for a pressurized water reactor environment comprises an outer pipe and an inner pipe located in the outer pipe, wherein a titanium-based filling layer is filled between the outer pipe and the inner pipe.

To the comparatively not enough problem of tritium permeation resistance who contains tritium helium pipeline among the prior art, the utility model provides a contain tritium helium pipeline suitable for pressurized water reactor environment adopts the double-layer tube structure of taking the filling layer, and the double-layer tube structure can provide the protection of more one deck, consequently reduces the tritium and reveals the risk. And the filling layer adopts the titanium-based filling layer, utilizes the effective absorption and stable storage capacity of metal titanium to tritium, reduces the tritium concentration of revealing to the interpiping region, effectively reduces the penetration leakage rate that tritium passed the outer tube. In this application, inner tube, titanium base filling layer and outer tube are as the three-layer barrier that prevents that tritium infiltration from revealing, can reduce the penetration leakage rate outside the tritium outside the pipe effectively.

Further, the titanium-based filling layer is sponge-like metal titanium. Inert gas is filled in the titanium-based filling layer and filled in gaps of the spongy metal titanium. The spongy metal titanium has gaps, the inert gas filled in the titanium-based filling layer is positioned in the gaps of the spongy metal titanium, and the metal titanium has better tritium absorption capacity under the inert gas environment, so that the permeation leakage rate of tritium to the outside of the pipe is further reduced.

Preferably, the inert gas is helium.

Preferably, the spongy metallic titanium is subjected to a high-temperature activation treatment. After the spongy metal titanium is activated at high temperature, tritium gas can be effectively absorbed at the temperature of 350-400 ℃; when the temperature is not more than 600 ℃, tritium absorbed by the titanium sponge can be stably stored and is rarely released. Therefore, tritium penetrating through the inner pipe in the pressurized water reactor environment is effectively absorbed by the titanium sponge in the interlayer between the pipes, so that the concentration of the tritium in the interlayer between the pipes is reduced, and the tritium leakage prevention pressure of the outer pipe is reduced. Wherein, the high-temperature activation treatment is the existing treatment process and can be realized by all the persons skilled in the art.

Preferably, the porosity of the sponge-like metallic titanium is 20% to 40%. The porosity is too large, tritium which can be absorbed by too little metal titanium content is less, the porosity is too low, the inert environment is insufficient, and the absorption capacity of the metal titanium to the tritium cannot be fully embodied, so that the optimal balance can be obtained in the optimal porosity range of the scheme, and the tritium can be absorbed by the spongy metal titanium to the maximum extent.

Further, the inner wall and the outer wall of the outer pipe are coated with impermeable coatings. The anti-seepage coating is used for preventing tritium from permeating, so that any coating capable of blocking tritium from penetrating in the prior art can be used as the anti-seepage coating in the scheme.

Preferably, the anti-seepage coating is Al₂O₃And (4) coating. Al (Al)₂O₃The coating has good tritium penetration resistance, and two layers of Al on the inner and outer wall surfaces of the outer tube₂O₃The coating can greatly reduce the tritium permeation leakage rate of the outer tube.

Preferably, the outer tube is made of austenitic stainless steel. Austenitic stainless steel is as outer tube material, can ensure the utility model discloses an overall strength makes the utility model discloses when effectively preventing tritium and oozing, maintain higher intensity, avoid external force to cause the physics to destroy easily.

Preferably, the inner tube is made of a zirconium alloy. The inner tube is made of zirconium alloy material, and the good tritium permeation prevention capability of the zirconium alloy material in a pressurized water reactor environment is utilized to effectively reduce the permeation leakage rate of tritium passing through the inner tube.

Compared with the prior art, the utility model, following advantage and beneficial effect have:

1. the utility model relates to a contain tritium helium pipeline suitable for pressurized water reactor environment adopts the double-layer tube structure of taking the filling layer, and the double-layer tube structure can provide the protection of more one deck, consequently reduces the tritium and reveals the risk. And the filling layer adopts the titanium-based filling layer, utilizes the effective absorption and stable storage capacity of metal titanium to tritium, reduces the tritium concentration of revealing to the interpiping region, effectively reduces the penetration leakage rate that tritium passed the outer tube. In this application, inner tube, titanium base filling layer and outer tube are as the three-layer barrier that prevents that tritium infiltration from revealing, can reduce the penetration leakage rate outside the tritium outside the pipe effectively.

2. The utility model relates to a contain tritium helium pipeline suitable for pressurized water reactor environment, spongy metal titanium has the gap, fills into in the gap that the intraformational inert gas of titanium base packing is in spongy metal titanium, and under the inert gas environment, metal titanium has better tritium absorption ability, and further reduction tritium is to the infiltration leakage rate outside the pipe.

3. The utility model relates to a contain tritium helium pipeline, two-layer Al of outer pipe inside and outside wall suitable for pressurized water reactor environment₂O₃The coating can greatly reduce the tritium permeation leakage rate of the outer tube. Austenitic stainless steel is as outer tube material, can ensure the utility model discloses an overall strength makes the utility model discloses when effectively preventing tritium and oozing, maintain higher intensity, avoid external force to cause the physics to destroy easily. The inner tube is made of zirconium alloy material, and the good tritium permeation prevention capability of the zirconium alloy material in a pressurized water reactor environment is utilized to effectively reduce the permeation leakage rate of tritium passing through the inner tube.

4. The utility model relates to a contain tritium helium pipeline suitable for pressurized-water reactor environment reveals through the infiltration that prevents tritium to the pipeline effectively, can prevent that tritium in the helium pipeline from revealing in a large number into the cooling water to effectively reduce the radioactive hazard that the tritium revealed the tritium-containing cooling water that produces. The utility model discloses can be applied to the design of the inside helium pipeline of helium-3 gas circuit reactor, also can be used to research pressurized water reactor fuel element power jump irradiation test in the heap.

Drawings

The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principles of the invention. In the drawings:

fig. 1 is a schematic structural diagram of an embodiment of the present invention.

Reference numbers and corresponding part names in the drawings:

1-outer tube, 2-titanium-based filling layer, 3-inner tube, 4-tritium-containing helium gas flow channel and 5-impermeable coating.

Detailed Description

To make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to the following examples and drawings, and the exemplary embodiments and descriptions thereof of the present invention are only used for explaining the present invention, and are not intended as limitations of the present invention.

Example 1:

the tritium-containing helium pipeline suitable for the pressurized water reactor environment as shown in fig. 1 comprises an outer pipe 1 and an inner pipe 3 positioned in the outer pipe 1, wherein a titanium-based filling layer 2 is filled between the outer pipe 1 and the inner pipe 3.

Wherein, the titanium-based filling layer 2 is sponge-like metallic titanium. And inert gas is filled in the titanium-based filling layer 2 and filled in gaps of the spongy metal titanium.

Preferably, the inert gas is helium.

In the embodiment, the inner pipe, the titanium-based filling layer and the outer pipe are used as three layers of barriers for preventing tritium from permeating and leaking, and the permeation leakage rate of tritium outside the pipe can be effectively reduced. And the filling layer adopts the titanium-based filling layer, utilizes the effective absorption and stable storage capacity of metal titanium to tritium under inert environment, reduces the tritium concentration of revealing to the intertube region, effectively reduces the penetration leakage rate that tritium passed the outer tube.

Example 2:

as shown in figure 1, on the basis of the embodiment 1, the spongy metal titanium is subjected to high-temperature activation treatment, and is suitable for a pressurized water reactor environment. The porosity of the spongy metallic titanium was 30%. And the inner wall and the outer wall of the outer pipe 1 are coated with impermeable coatings 5. The anti-seepage coating is Al₂O₃And (4) coating. The outer tube 1 is made of austenitic stainless steel. The inner tube 3 is made of zirconium alloy.

In this example, Al₂O₃The coating has good tritium penetration resistance, and two layers of Al on the inner and outer wall surfaces of the outer tube₂O₃The coating can greatly reduce the tritium permeation leakage rate of the outer tube. Austenitic stainless steel is as outer tube material, can ensure the utility model discloses an overall strength makes the utility model discloses when effectively preventing tritium and oozing, maintain higher intensity, avoid external force to cause the physics to destroy easily. The inner tube is made of zirconium alloy material, and the good tritium permeation prevention capability of the zirconium alloy material in a pressurized water reactor environment is utilized to effectively reduce the permeation leakage rate of tritium passing through the inner tube.

The above-mentioned embodiments, further detailed description of the objects, technical solutions and advantages of the present invention, it should be understood that the above description is only the embodiments of the present invention, and is not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the scope of the present invention.

Claims

1. The tritium-containing helium pipeline suitable for the pressurized water reactor environment is characterized by comprising an outer pipe (1) and an inner pipe (3) located in the outer pipe (1), wherein a titanium-based filling layer (2) is filled between the outer pipe (1) and the inner pipe (3).

2. The tritiated helium gas pipeline suitable for the pressurized water reactor environment as claimed in claim 1, characterized in that the titanium-based packing layer (2) is sponge-like metallic titanium.

3. The tritium-containing helium pipeline suitable for the pressurized water reactor environment as claimed in claim 2, wherein the titanium-based filling layer (2) is filled with inert gas, and the inert gas is filled in gaps of the spongy metallic titanium.

4. A tritiated helium gas pipeline suitable for use in a pressurized water reactor environment as claimed in claim 3 wherein the inert gas is helium.

5. A tritiated helium gas pipeline suitable for a pressurized water reactor environment as claimed in claim 2, characterized in that the spongy metallic titanium is subjected to high temperature activation treatment.

6. A tritiated helium gas pipeline suitable for a pressurized water reactor environment according to claim 2 is characterized in that the sponge-like metallic titanium has a porosity of 20-40%.

7. The tritiated helium gas pipeline suitable for the pressurized water reactor environment is characterized in that the inner wall and the outer wall of the outer pipe (1) are coated with anti-seepage coatings (5).

8. Tritiated helium gas pipeline suitable for pressurized water reactor environment according to claim 7, characterized in that the anti-seepage coating (5) is Al₂O₃And (4) coating.

9. Tritiated helium gas pipeline suitable for pressurized water reactor environment according to claim 1 characterized by that the outer tube (1) is made of austenitic stainless steel.

10. The tritiated helium gas pipeline suitable for a pressurized water reactor environment according to claim 1, characterized in that the inner tube (3) is made of zirconium alloy.