CN203908882U - Special measurement device for creep property of nuclear zirconium alloy tubing - Google Patents

Abstract

The utility model relates to a special measuring device for the creep performance of zirconium alloy pipes for nuclear use. Alloy sample tube, pressure injection tube and pressure delivery tube respectively connected to both ends of the sample tube, axial creep fixture and clamps arranged at the end of the sample tube, the zirconium alloy sample tube is set in a cylindrical In the resistance furnace, the pressure injection pipe is connected with the high-pressure gas outlet of the pressurization unit; the test unit includes a laser caliper, a temperature control thermocouple installed outside the sample tube, a displacement sensor and a pressure sensor; the control unit includes a master control cabinet, They are respectively connected with each test device, pressurization unit and heating unit of the test unit to realize closed-loop control of temperature and pressure. The utility model can measure axial creep and radial creep online simultaneously, can control temperature and pressure in a closed loop, can load axially, has low cost, and has high test success rate.

Description

A special measuring device for the creep performance of nuclear zirconium alloy pipes

technical field

The utility model relates to a device for measuring the creep performance of a nuclear zirconium alloy pipe material.

Background technique

The nuclear fuel element is the core component of the reactor, consisting of fuel pellets, cladding and its components. Due to the relatively harsh operating environment of nuclear fuel elements, neutron irradiation, corrosion of coolant, and mechanical interaction between fuel pellets and zirconium alloy cladding tubes and release of fission gas products during reactor opening, shutdown, and late operation, the cladding The shell tube bears bidirectional stress, which will cause the mechanical properties of the fuel element to decline, forming a safety hazard. The safety performance of nuclear fuel elements directly affects the safety and reliability of the reactor. In the design of nuclear fuel elements and the evaluation of simulated working conditions, it is necessary to understand the basic properties of zirconium alloy cladding tubes, including internal pressure creep and durability.

Usually, the determination of high temperature creep and durability of metal materials is to select a standard circular cross-section sample for high temperature uniaxial tensile creep or durability test, which cannot reflect the creep performance of the sample under the hoop stress state. The hoop tensile and hoop creep tests can simulate the single hoop stress state of the zirconium alloy pipe, but under actual use conditions, the zirconium alloy pipe is actually subjected to hoop and axial two-dimensional stress when it is subjected to internal pressure at high temperature , there is a certain gap between the results of the traditional tensile creep and endurance test methods and the actual working conditions. Therefore, using zirconium alloy pipes to directly withstand internal pressure at high temperatures for internal pressure creep tests can better simulate the actual stress state in applications, and the test results have stronger guiding significance.

Internationally, the boiler tube internal pressure creep test method is mainly used for the internal pressure creep test of metal pipes. Since the 1970s, the domestic thermal power industry has established a batch of boiler tube internal pressure creep test machines, and conducted a large number of internal pressure creep tests on boiler tubes. However, these test machines have high leakage rates and unstable test pressures. Defects such as poor temperature control accuracy. The newly developed zirconium alloy internal pressure creep test device mainly adopts the method of welding the sample after pressurization to ensure the sealing. After keeping warm for several hours under the test conditions, the outer diameter is measured after cooling, so as to determine the deformation amount of the pipe hoop creep. The main disadvantages of this method are 1. If there is pressure leakage in the test pipe, further testing cannot be done; 2. With the increase of deformation, the pressure in the test pipe will decrease, and the test conditions will change; 3. It is impossible to monitor the test online The circumferential deformation of the pipe under the condition.

Contents of the invention

The technical problem to be solved by the utility model is to overcome the deficiencies in the prior art and provide a special measuring device for the creep performance of zirconium alloy pipes for nuclear use. The complex stress state of the cladding in the reactor improves the success rate of the test, close-loop controls the test temperature and pressure, and realizes real-time online recording of data.

In order to solve the above technical problems, the utility model takes the following technical solutions:

A special measurement device for the creep performance of zirconium alloy pipes for nuclear use, which includes a sample unit, a heating unit, a test unit, a pressurizing unit for providing high-pressure gas, and a control unit. The heating unit includes a cylindrical resistance furnace, and the sample unit It includes a zirconium alloy sample tube to be tested, a pressure injection tube and a pressure delivery tube respectively connected to the two ends of the sample tube, an axial creep clamp set at one end of the sample tube, and a clamp set at the end of the sample tube. The zirconium alloy sample tube is set in the cylindrical resistance furnace, and the pressure injection pipe is connected with the high-pressure gas outlet of the pressurization unit; the test unit includes a laser caliper for measuring the outer diameter of the sample tube, installed in the test The temperature control thermocouple outside the sample tube, the displacement sensor used to measure the change of the axial length of the sample tube, and the pressure sensor used to measure the pressure of the sample tube; the control unit includes a general control cabinet, which is connected to each test device of the test unit , pressurization unit, and heating unit are connected to realize closed-loop control of temperature and pressure.

According to a specific aspect, the cylindrical resistance furnace and the sample tube are arranged upright, and the displacement sensor is located below the sample unit.

Preferably, the pressurization unit includes a power gas pipeline, a working gas pipeline, a gas booster, and a plurality of high-pressure gas outlet pipelines connected in parallel with the gas booster, and the end of the high-pressure gas outlet pipeline is a high-pressure Gas outlet.

Preferably, the power gas pipeline is sequentially connected with a compressed air interface, a filter, a pressure regulating valve, a pressure gauge, a safety valve and a shut-off valve.

Preferably, the gas pipeline includes a working gas cylinder and sequentially connected filters, pressure gauges and stop valves; the working gas is pressurized into high-pressure gas through a gas booster.

Preferably, the high-pressure gas outlet pipeline is sequentially provided with a safety valve, a high-pressure cut-off valve, a pressure gauge and a high-pressure unloading valve from the end connected to the gas booster to the high-pressure gas outlet.

Preferably, the pressure injection pipe and the pressure delivery pipe are both made of 316 stainless steel, which can withstand a pressure of 60,000 psi at room temperature.

Preferably, the pressure injection pipe and the pressure transmission pipe are respectively connected to the sample pipe through Swagelok quick connectors.

Preferably, the measuring device further includes a pressure device for applying an axial load to the sample tube through the chuck. The hoop and axial stress ratio of the sample tube can be adjusted through the pressure device and the chuck.

Preferably, the cylinder-type resistance furnace adopts multi-stage heating and temperature control, and the uniform temperature zone is greater than or equal to 300mm, so as to ensure sufficient length of the uniform temperature zone.

Preferably, there are multiple heating units, and the multiple heating units are mutually independent and do not interfere with each other.

The usage method of the utility model is: after the sample surface temperature of the whole test heating unit reaches the test temperature, the sample is pressurized to the required test pressure by connecting the high-pressure gas outlet of the pressurizing unit with the sample and keeping the pressure and temperature stable, On-line measurement of axial and radial creep results of zirconium alloy pipes.

Due to the implementation of the above technical solutions, the utility model has the following advantages compared with the prior art:

The device for measuring the internal pressure and creep performance of zirconium alloy pipes for nuclear use of the utility model is an online measuring device, which can simultaneously measure axial creep and radial creep online, can control temperature and pressure in a closed loop, and can be loaded axially. Low, high test success rate, especially suitable for online measurement of internal pressure creep performance of nuclear zirconium alloy pipes under complex stress states in reactors.

Description of drawings

Below in conjunction with accompanying drawing and specific embodiment the utility model is described in further detail.

Fig. 1 is the structural representation of the special measuring device for the creep performance of the nuclear zirconium alloy pipe according to the present invention;

Figure 2 is a partial enlarged schematic view of Figure 1;

Among them: A. Pressurization unit; B. Heating unit; 1. Compressed air interface; 2. Filter; 3. Pressure regulating valve; 4. Pressure gauge; 5. Safety valve; 6. Stop valve; 7. Working gas cylinder ; 8. Gas booster; 9. High-pressure cut-off valve; 10. High-pressure unloading valve; 11. High-pressure gas outlet; 12. Cylindrical resistance furnace; 13. Laser diameter measuring instrument; Displacement sensor; 18. Pressure sensor; 19. General control cabinet; 20. Chuck; 21. Pressure injection pipe; 22. Swagelok quick connector; 23. Sample pipe; 24. Pressure output pipe; 25. Axial creep fixture.

Detailed ways

As shown in Figure 1, the special measurement device for creep performance of zirconium alloy pipes for nuclear use provided in this example includes a pressurizing unit A, a control unit, multiple heating units B, and a testing unit. In the heating unit B, a sample unit D is provided. The control unit includes a general control cabinet 19, which is respectively connected with each test device, pressurization unit A, and heating unit B of the test unit to realize closed-loop control of temperature and pressure.

The pressurizing unit A includes a power gas pipeline, a working gas pipeline, a gas booster and a plurality of high-pressure gas outlet pipelines connected in parallel with the gas booster, and the end of the high-pressure gas outlet pipeline is a high-pressure gas outlet. A compressed air interface 1, a filter 2, a pressure regulating valve 3, a pressure gauge 4, a safety valve 5 and a shut-off valve 6 are sequentially connected to the power gas pipeline. The working gas pipeline includes a working gas cylinder 7 and a filter 2 connected in sequence, a pressure gauge 4 and a shut-off valve 6; the working gas is pressurized into a high-pressure gas through a gas booster 8 . The high-pressure gas outlet pipeline is sequentially connected with a safety valve 5 , a high-pressure cut-off valve 9 , a pressure gauge 4 and a high-pressure unloading valve 10 to the high-pressure gas outlet 11 . The implementation of the pressurization unit A is as follows: the compressed air enters through the compressed air interface 1, and supplies power for the gas booster 8 through the filter 2, the pressure regulating valve 3, the pressure gauge 4 and the stop valve 6 in sequence. The working gas passes through the filter 2, the pressure gauge 4 and the shut-off valve 6 in turn, and is boosted by the gas booster 8 to high-pressure gas, and then enters each sample tube through the high-pressure shut-off valve 9 to the high-pressure gas outlet 11. Pressure gauge 4 measures the pressure of each stage. Pressure gauge 4, shut-off valve 6 and high-pressure shut-off valve 9 are connected with the main control cabinet 19 of the control unit. When the sample reaches the set pressure, it will stop automatically, and when the set pressure reaches a certain level, it will automatically replenish pressure.

The drum-type resistance furnace 12 adopts multi-stage heating and temperature control, and the uniform temperature zone is greater than 300 mm to ensure sufficient length of the uniform temperature zone.

Referring to FIG. 2 , the sample unit of the present invention includes a sample tube 23 , a pressure injection tube 21 and a pressure delivery tube 24 arranged at both ends of the sample tube 23 , an axial creep fixture 25 and a chuck 20 . The pressure injection pipe 21 and the pressure delivery pipe 24 are made of 316 stainless steel, which can withstand a pressure of 60,000 psi at room temperature, and are connected to the sample pipe 23 with a Swagelok quick connector 22; the chuck 20 can apply an axial load and adjust the ring to the axial direction stress ratio.

The test unit includes a laser caliper 13 installed outside the cylindrical resistance furnace 12 for measuring the outer diameter of the sample tube, a temperature control thermocouple 15 installed outside the sample tube 23, and a displacement sensor installed under the sample unit 17 and pressure sensor 18.

The heating units of the utility model are independent of each other and do not interfere with each other. After the sample surface temperature of the entire test heating unit reaches the test temperature, the sample is pressurized to the required test pressure by connecting the high pressure outlet of the pressurizing unit with the sample and kept The pressure and temperature are stable, and the axial and radial creep results of zirconium alloy pipes are measured online.

The utility model has been described in detail above, its purpose is to allow those familiar with the technology in this field to understand the content of the utility model and implement it, and can not limit the scope of protection of the utility model. All equivalent changes or modifications made in essence shall fall within the protection scope of the present utility model.

Claims (10)

1. a nuclear zirconium alloy pipe croop property special measurement device, it is characterized in that: comprise sample cell, heating unit, test cell, for presser unit and the control module of gases at high pressure are provided, described heating unit comprises cartridge type resistance furnace, described sample cell comprises zircaloy coupon to be tested, the pressure ascending pipe and the pressure that are connected with the two ends of described coupon respectively spread out of pipe, be arranged on the Axial creep fixture of described coupon one end and be arranged on the chuck of described coupon end, described zircaloy coupon is arranged in described cartridge type resistance furnace, described pressure ascending pipe is communicated with the gases at high pressure outlet of described presser unit, described test cell comprises laser diameter measuring instrument for measuring described coupon external diameter, be arranged on temperature-control heat couple outside described coupon, for measuring displacement transducer that coupon axial length changes and for measuring the pressure transducer of described coupon pressure, described control module comprises overhead control cabinet, and it is connected with the each described proving installation of described test cell, described presser unit, described heating unit respectively, realizes the closed-loop control of temperature and pressure.

2. nuclear zirconium alloy pipe croop property special measurement device according to claim 1, is characterized in that: described cartridge type resistance furnace and coupon uprightly arrange, and described displacement transducer is positioned at described sample cell below.

3. nuclear zirconium alloy pipe croop property special measurement device according to claim 1, it is characterized in that: described presser unit comprises power air pipe, work air pipe, gas booster and the multiple gases at high pressure export pipelines that are connected in parallel with gas booster, and the end of described gases at high pressure export pipeline is gases at high pressure outlets.

4. nuclear zirconium alloy pipe croop property special measurement device according to claim 3, is characterized in that: on described power air pipe, be connected with compressed air interface, filtrator, pressure regulator valve, tensimeter, safety valve and stop valve in turn.

5. nuclear zirconium alloy pipe croop property special measurement device according to claim 3, is characterized in that: described air pipe comprises work gas cylinder and the filtrator, tensimeter and the stop valve that connect successively; Work gas gas is gases at high pressure by described gas booster supercharging.

6. nuclear zirconium alloy pipe croop property special measurement device according to claim 3, is characterized in that: described gases at high pressure export pipeline exports and is provided with successively safety valve, high-pressure stop valve, tensimeter and high-pressure unloading valve to gases at high pressure from the end being connected with gas booster.

7. nuclear zirconium alloy pipe croop property special measurement device according to claim 1, is characterized in that: said pressure ascending pipe, pressure spread out of pipe and all adopts 316 stainless steels to make, allowable stress 60000psi under room temperature.

8. nuclear zirconium alloy pipe croop property special measurement device according to claim 1, is characterized in that: said pressure ascending pipe spreads out of pipe with pressure and is connected with described coupon by Swagelok rapid-acting coupling respectively.

9. nuclear zirconium alloy pipe croop property special measurement device according to claim 1, is characterized in that: described measurement mechanism also comprises the pressure apparatus that applies axial load by described chuck to described coupon.

10. nuclear zirconium alloy pipe croop property special measurement device according to claim 1, is characterized in that: described cartridge type resistance furnace adopts multistage heating temperature control, and uniform temperature zone is more than or equal to 300mm.