阅读说明：本技术 一种核反应堆环形燃料损毁实验装置及实验方法 (A kind of nuclear reactor annular fuel damage experimental provision and experimental method ) 是由 张亚培 吴世浩 王栋 苏光辉 田文喜 秋穗正 于 2019-08-16 设计创作，主要内容包括：本发明公开了一种核反应堆环形燃料损毁实验装置及实验方法,该装置包括顶/底部冷却腔室、气体出口段、中部保温段和底部注水/气腔室。顶/底部冷却腔室均由上、下端盖围成,内置铜电极；气体出口段为不锈钢水冷套筒；中部保温段从内到外由氧化锆陶瓷筒、氧化锆纤维隔热层和不锈钢冷却套筒组成；底部注水/气腔室连通进水、进气管道。装置内置由支撑管座、密封环、螺旋型钼电极、钨铼合金管和内/外包壳管组成的环形燃料模拟棒或棒束；通过铜电极对模拟棒进行电加热以模拟燃料衰变热,加热最高温度可达2500℃,能够真实营造堆芯损毁时的氛围。实验装置能够研究无氧、蒸汽氧化和注水情况下环形燃料包壳的高温氧化、破裂和熔化特性。(It include top/bottom coohng chamber, gas vent section, middle part soaking zone and bottom water injection/gas chamber the invention discloses a kind of nuclear reactor annular fuel damage experimental provision and experimental method, the device.Top/bottom coohng chamber is surrounded by upper and lower end caps, built-in copper electrode；Gas vent section is stainless steel water cooling sleeve；Middle part soaking zone is made of zirconia ceramics cylinder, Zirconium oxide fibre thermal insulation layer and stainless steel cooling cover from inside to outside；Bottom water injection/gas chamber's connection water inlet, admission line.The built-in annular fuel simulation stick or cluster being made of support tube socket, sealing ring, screw type molybdenum electrode, tungsten-rhenium alloy pipe and inside/outside cladding tubes of device；Simulation stick is electrically heated with analog fuel decay heat by copper electrode, maximum temperature is heated up to 2500 DEG C, can really build atmosphere when reactor core damage.Experimental provision can study high-temperature oxydation, rupture and the pre-arcing characterisitics of annular fuel involucrum in the case of anaerobic, steam oxidation and water filling.)

1. a kind of nuclear reactor annular fuel damages experimental provision, which is characterized in that including middle part soaking zone, middle part soaking zone is Multi-layer sleeve structure, it is cold by zirconia ceramic cylinder (1), zirconia fiber thermal insulation layer (2) and outer layer stainless steel from inside to outside But sleeve (3) forms；Middle part soaking zone top is the gas vent pipeline section that stainless steel cooling cover (4) are constituted, and is gone out positioned at gas The top upper end cover (7) and top lower cover (6) on mouth pipeline section top surround top cooling chamber；The vertical section of gas vent pipeline section Equipped with crestal gas injection mouth (5), coolant is equipped in top upper end cover (7) and is imported and exported；Middle part heat preservation pars infrasegmentalis connection bottom water injection/ Gas chamber, bottom water injection/gas chamber's connection admission line (8) and water inlet line (9), positioned at bottom water injection/gas chamber lower part Bottom upper end cover (10) and bottom lower cover (11) surround bottom coohng chamber；Coolant is equipped in bottom lower cover (11) to pass in and out Mouthful；Heating electrode (12) is built in bottom coohng chamber and top cooling chamber；Setting annular in zirconia ceramic cylinder (1) Fuel simulation stick (13), it successively includes interior cladding tubes (15), tungsten-rhenium alloy heating tube that annular fuel simulates stick (13) from inside to outside (14) it is connected with outsourcing package (16), the upper and lower side of tungsten-rhenium alloy pipe (14) with screw type molybdenum electrode (17)；Annular fuel simulation Stick (13) upper and lower side is sealed by sealing ring (18), and fixed by the support tube socket (19) of sealing ring (18) outside, screw type molybdenum Electrode (17) is used to compensate the axial deformation that tungsten-rhenium alloy pipe (14) may occur and prevents tungsten-rhenium alloy pipe stiffness cracks, supports When tube socket (19) guarantees water filling or gas injection, fluid is flowed through out of interior cladding tubes (15)；In sealing ring (18) and support tube socket (19) It boxes out, is used for throw out spiral type molybdenum electrode (17)；Screw type molybdenum electrode (17) is connected with heating electrode (12) using card slot form, Convenient for replacement simulation stick under different experiment conditions；Experimental provision can study oxygen-free environment, steam oxidation and bottom respectively and flood Annular fuel simulates high-temperature oxydation characteristic, cracking properties and the pre-arcing characterisitics of cladding tubes inside and outside stick (13) in the case of not, can All behaviors that comprehensive research annular fuel involucrum may occur under reactor core major accident.

2. a kind of nuclear reactor annular fuel according to claim 1 damages experimental provision, which is characterized in that the annular The length of fuel simulation stick (13) is 1.2m；The inside radius of interior cladding tubes (15) is 4.1mm, with a thickness of 0.57mm；Tungsten-rhenium alloy Manage (14) with a thickness of 2.225mm, outsourcing package (16) with a thickness of 0.74mm.

3. a kind of nuclear reactor annular fuel according to claim 1 damages experimental provision, which is characterized in that the annular The Krypton that predetermined amount has been poured inside fuel simulation stick (13), for prompting invalid temperature and the out-of-service time of involucrum.

4. a kind of nuclear reactor annular fuel according to claim 1 damages experimental provision, which is characterized in that the middle part Zirconia ceramic cylinder (1) is used with gas vent pipeline section and bottom water injection/gas chamber and is threadedly coupled in soaking zone, convenient for tearing open It unloads, by replacing various sizes of zirconia ceramic cylinder (1), can carry out for single rod, 3 × 3 clusters and 5 × 5 clusters real It tests.

5. a kind of nuclear reactor annular fuel according to claim 1 damages experimental provision, which is characterized in that the experiment Device uses modularized design, is easily installed disassembly, can carry out multiple groups experiment condition in a short time.

6. a kind of nuclear reactor annular fuel according to claim 1 damages experimental provision, which is characterized in that multiple high temperature Wolfram rhenium heat electric couple inside and outside annular fuel simulation stick (13) cladding tubes and zirconia ceramic cylinder (1) different height with adherent arrangement Mode carry out thermometric, and be recorded on computer in real time by capture card；It is big using low pressure that annular fuel simulates stick (13) heating Electric current heating source, prevents human electric shock；It is connected with the cooling water flowed fast through around the heating electrodes (12) of bottom and top, to adding Thermode (12) is cooled down in time, also can quickly be exported the heat of screw type molybdenum electrode (17) generation, be prevented electrode overheating； It is equipped with cooling cover, interior logical argon gas or water outside middle part soaking zone and gas outlet pipe section, prevents experimental provision outer surface Overheat；Gas vent pipeline section is connected with mass spectrograph, and real-time online measuring annular fuel simulates the hydrogen generation rate of stick (13), with And detection Krypton；The argon gas that constant mass flow is passed through in experimental provision generates hydrogen as annular fuel simulation stick (13) Carrier gas, in the case where operating condition is flooded in bottom, argon gas changes from crestal gas injection mouth (5) injection in gas vent pipeline section vertical section.

7. a kind of nuclear reactor annular fuel according to claim 1 damages experimental provision, which is characterized in that the top The material of upper end cover (7), admission line (8), water inlet line (9) and bottom upper end cover (10) and bottom lower cover (11) is not Become rusty steel；The material of top lower cover (6) is aluminium oxide ceramics；Sealing ring (18) and the material for supporting tube socket (19) are zirconium dioxide Ceramics；The material of interior cladding tubes (15) and outsourcing package (1) is zirconium -4 alloy.

8. a kind of nuclear reactor annular fuel according to claim 1 damages experimental provision, which is characterized in that the heating Electrode (12) is copper electrode.

9. the experimental method of the described in any item nuclear reactor annular fuel damage experimental provisions of claim 1 to 8, feature exist When, warm-up phase, external argon gas source is filled after heating by the admission line (8) of bottom with the rate injection experiments of 5g/s It sets, the air in experimental provision is discharged；After the high temperature gas injection of 20min~40min, it is believed that the sky in entire experimental provision Gas all empties；When the experimental stage, electric heater unit is connected with heating electrode (12), and heating power is since 0kW with 0.1W/ The rate of s~0.5W/s is raised slowly to 7kW~10kW, hereafter, according to the difference of experiment condition, it is different to test process: research When oxygen-free environment operating condition, continuous heating is only needed until cladding tubes fusing inside and outside annular fuel simulation stick (13)；Study steam oxidation When operating condition, need high-temperature steam out of, bottom admission line (8) injection experiments device；When operating condition is flooded in research bottom, need Cooling water is injected into experimental provision from the water inlet line (9) of bottom, while argon gas is changed with identical rate from top note Port (5) injection, after water filling starts 10s~20s, heating power is quickly down to 0.2kW~0.3kW and is maintained until cooling water is infused Enter to middle part soaking zone top；After experiment, by analysis experimental result, discloses annular fuel oxidation, rupture, fusing and melt Melt the migratory behaviour mechanism of object.

Technical field

The invention belongs to nuclear reactor annular fuels to damage experimental technique field, and in particular to a kind of nuclear reactor annular combustion Material damage experimental provision and experimental method.

Background technique

Reactor disaster is the physics and chemical process of a multi phase state, multi-component complexity.Heap under major accident The destructive process of core is divided into early and late two stages.Early damage process refers to the incipient stage of destruction, including fuel stack The oxidation of part involucrum, rupture and the fusing and repositioning of some materials.Advanced stage destructive process refers to the shift phase of reactor core material, Fusing, repositioning including a large amount of reactor core materials form fragment bed and melted material is to lower head of pressure vessel and containment Transfer.The destruction process of reactor core early damage has important influence for the development of major accident later, studies early damage Fuel rod in process, fuel assembly damage process be of great significance to the formulation of reactor disaster mitigation strategy.

Stick fuel as traditional reactor fuel, it is damaged both at home and abroad process carried out it is a large amount of experiment grind Study carefully, PBF-SFD serial experiment, the breast tooth of CORA series and QUENCH serial experiment, U.S. INEL development that such as Germany KIT carries out What the ATLAS serial experiment of CODEX serial experiment, South Korea KAERI development that sharp KFKI carries out and Xi'an Communications University carried out FORMA serial experiment etc..Based on this, oxidation, rupture, fusing and repositioning mould that domestic and foreign scholars have developed stick fuel perfect Type.

In order to preferably utilize nuclear energy, the economy and safety of nuclear power plant are improved, many novel fuel start to be mentioned Out, annular fuel also belongs to one kind of New-type fuel.And since annular fuel can keep or promote existing reactor safety Core power density 20%~50% is promoted under the premise of performance, has become the important of New-type fuel element research and development in the world One of direction.In China, annular fuel comes into test phase in heap.

Annular fuel is a kind of fuel element reformed completely in structure.It is by inside and outside two layers of zirconium alloy cladding and circle Cricoid uranium dioxide pellet composition, coolant can simultaneously cool down fuel element from inside and outside two runners.Annular fuel The change of structure means that the model under original major accident suitable for stick fuel is no longer applicable in.But annular combustion Material is used as a kind of New-type fuel, at present both at home and abroad to the almost blank of the research of behavior under its major accident.Therefore, it is necessary to Carry out annular fuel damage experiment and go behavior of the research annular fuel under major accident, is the exploitation of annular fuel corresponding model Data supporting is provided, the blank studied both at home and abroad annular fuel major accident aspect is filled up.

Summary of the invention

To solve the above problems, the purpose of the present invention is to provide a kind of nuclear reactor annular fuel damage experimental provision and Experimental method is opened for disclosing annular fuel oxidation, rupture, fusing and the migratory behaviour mechanism of fusant using experimental data Send out Analysis on Mechanism model corresponding, the formulation for annular fuel severe accident relieving measure provides reference, fills up corresponding both at home and abroad The blank of research.

To achieve the above object, the technical solution adopted by the present invention is that:

A kind of nuclear reactor annular fuel damage experimental provision, including middle part soaking zone, middle part soaking zone are multilayer sleeve Structure is made of zirconia ceramic cylinder 1, zirconia fiber thermal insulation layer 2 and outer layer stainless steel cooling cover 3 from inside to outside； Middle part soaking zone top is the gas vent pipeline section that stainless steel cooling cover 4 is constituted, positioned at the top on gas vent pipeline section top Upper end cover 7 and top lower cover 6 surround top cooling chamber；The vertical section of gas vent pipeline section is equipped with crestal gas injection mouth 5, top Coolant is equipped in upper end cover 7 to import and export；Middle part keeps the temperature pars infrasegmentalis and is connected to bottom water injection/gas chamber, and bottom water injection/gas chamber connects Logical admission line 8 and water inlet line 9, positioned at connection bottom water injection/gas chamber bottom bottom upper end cover 10 and bottom lower cover 11 surround bottom coohng chamber；Coolant is equipped in bottom lower cover 11 to import and export；Heating electrode 12 is built in bottom coohng chamber In room and top cooling chamber；Annular fuel is set in zirconia ceramic cylinder 1 and simulates stick 13, annular fuel simulates stick 13 by interior To outside successively including interior cladding tubes 15, tungsten-rhenium alloy heating tube 14 and outsourcing package 16, the upper and lower side and spiral shell of tungsten-rhenium alloy pipe 14 Rotation type molybdenum electrode 17 is connected；Annular fuel simulation 13 upper and lower side of stick is sealed by sealing ring 18, and passes through the branch outside sealing ring 18 Stay tube seat 19 is fixed, and screw type molybdenum electrode 17 is used to compensate the axial deformation that tungsten-rhenium alloy pipe 14 may occur and prevents W-Re from closing Golden pipe stiffness cracks, when support tube socket 19 guarantees water filling or gas injection, fluid is flowed through out of interior cladding tubes 15；Sealing ring 18 and support It boxes out in tube socket 19, is used for throw out spiral type molybdenum electrode 17；Screw type molybdenum electrode 17 uses card slot form phase with heating electrode 12 Even, convenient for replacement simulation stick under different experiment conditions；Experimental provision can study oxygen-free environment, steam oxidation and bottom respectively Annular fuel simulates high-temperature oxydation characteristic, cracking properties and the pre-arcing characterisitics of cladding tubes inside and outside stick 13 in the case of flooding, can All behaviors that comprehensive research annular fuel involucrum may occur under reactor core major accident.

The length of the annular fuel simulation stick 13 is 1.2m；The inside radius of interior cladding tubes 15 is 4.1mm, with a thickness of 0.57mm；Tungsten-rhenium alloy pipe 14 with a thickness of 2.225mm, outsourcing package 16 with a thickness of 0.74mm.

The Krypton that predetermined amount has been poured inside the annular fuel simulation stick 13, for prompting invalid temperature and the mistake of involucrum Imitate the time.

Zirconia ceramic cylinder 1 and gas vent pipeline section and bottom water injection/gas chamber use spiral shell in the middle part soaking zone Line connection, it is easy to disassemble, by replacing various sizes of zirconia ceramic cylinder 1, single rod, 3 × 3 clusters and 5 × 5 can be directed to Cluster carries out experiment.

The experimental provision uses modularized design, is easily installed disassembly, can carry out multiple groups experiment condition in a short time.

Multiple high temperature Wolfram rhenium heat electric couples cladding tubes and zirconia ceramic cylinder 1 inside and outside annular fuel simulation stick 13 is Bu Tong high Degree carries out thermometric in a manner of adherent arrangement, and is recorded on computer in real time by capture card；Annular fuel is simulated stick 13 and is heated Using low-voltage, high-current heating source, human electric shock is prevented；Be connected with around the heating electrode 12 of bottom and top flow fast through it is cold But water cools down heating electrode 12 in time, also can quickly export the heat of the generation of screw type molybdenum electrode 17, prevent electrode Overheat；It is equipped with cooling cover, interior logical argon gas or water outside middle part soaking zone and gas outlet pipe section, prevents outside experimental provision Surface overheat；Gas vent pipeline section is connected with mass spectrograph, and real-time online measuring annular fuel simulates the hydrogen generation rate of stick 13, And detection Krypton；The argon gas (5g/s) that constant mass flow is passed through in experimental provision is generated as annular fuel simulation stick 13 The carrier gas of hydrogen, in the case where operating condition is flooded in bottom, argon gas changes to be injected from the crestal gas injection mouth 5 in gas vent pipeline section vertical section.

The top upper end cover 7, admission line 8, water inlet line 9 and bottom upper end cover 10 and bottom lower cover 11 material Material is stainless steel；The material of top lower cover 6 is aluminium oxide ceramics；The material of sealing ring 18 and support tube socket 19 is zirconium dioxide Ceramics；The material of interior cladding tubes 15 and outsourcing package 16 is zirconium -4 alloy.

The heating electrode 12 is copper electrode.

The experimental method of the described nuclear reactor annular fuel damage experimental provision, when warm-up phase, external argon gas source warp It crosses after heating through the admission line 8 of bottom with the rate injection experiments device of 5g/s, the air in experimental provision is discharged；Through After crossing the high temperature gas injection of 20min~40min, it is believed that the air in entire experimental provision all empties；When the experimental stage, electricity adds Thermal is connected with heating electrode 12, and heating power is slowly risen up to 7kW since 0kW with the rate of 0.1W/s~0.5W/s Hereafter~10kW according to the difference of experiment condition, it is different to test process: when research oxygen-free environment operating condition, only needing continuous heating straight Cladding tubes fusing inside and outside to annular fuel simulation stick 13；When studying steam oxidation operating condition, need high-temperature steam from bottom into In 8 injection experiments device of feed channel；When operating condition is flooded in research bottom, cooling water is needed to be injected into from the water inlet line 9 of bottom In experimental provision, while argon gas is changed with identical rate from the injection of crestal gas injection mouth 5, after water filling starts 10s~20s, heats function Rate is quickly down to 0.2kW~0.3kW and is maintained until cooling water is injected into middle part soaking zone top；After experiment, by dividing Experimental result is analysed, the migratory behaviour mechanism of annular fuel oxidation, rupture, fusing and fusant is disclosed.

Compared with prior art, the device have the advantages that it is as follows:

1. annular fuel simulation stick is arranged in the experimental provision in zirconia ceramic cylinder, annular fuel simulates stick and uses tungsten Rhenium alloys pipe is heated, and the decay heat of annular fuel is simulated, and is tested heating temperature up to 2500 DEG C, can really be built reactor core Adverse circumstances under major accident.

2. the annular fuel simulation stick designed in the present invention meets the structure function of annular fuel, gas and coolant can be with Cladding tubes flow through simultaneously inside and outside annular fuel simulation stick.

3. annular fuel involucrum in the case of oxygen-free environment, steam oxidation and bottom are flooded can be studied in the present invention respectively High-temperature oxydation characteristic, cracking properties and pre-arcing characterisitics, comprehensive understanding annular fuel involucrum may under reactor core major accident All behaviors occurred.

4. annular fuel simulation stick is connected with the heating electrode of top/bottom chamber using card slot form in the present invention, just The replacement simulation stick under different experiment conditions.

5. zirconia ceramic cylinder is adopted with gas vent pipeline section and bottom water injection/gas chamber in the soaking zone of middle part in the present invention It is threadedly coupled, it is easy to disassemble, experiment can be carried out for single rod, 3 × 3 clusters and 5 × 5 clusters.

6. a certain amount of Krypton has been poured inside annular fuel simulation stick in the present invention, for prompting the invalid temperature of involucrum And the out-of-service time.

7. experimental provision uses modularized design in the present invention, it is easily installed disassembly, multiple groups reality can be carried out in a short time Test operating condition.

Detailed description of the invention

Fig. 1 is that nuclear reactor annular fuel damages experimental provision schematic diagram.

Fig. 2 is that nuclear reactor annular fuel damages soaking zone sectional view in the middle part of experimental provision.

Fig. 3 is that annular fuel simulates stick schematic cross-section.

1 is zirconia ceramic cylinder in figure, and 2 be zirconia fiber thermal insulation layer, and 3 be outer layer stainless steel cooling cover, and 4 are Stainless steel cooling cover, 5 be crestal gas injection mouth, and 6 be top lower cover, and 7 be top upper end cover, and 8 be admission line, and 9 be water inlet Pipeline, 10 be bottom upper end cover, and 11 be bottom lower cover, and 12 be heating electrode, and 13 simulate stick for annular fuel, and 14 close for W-Re Jin Guan, 15 be interior cladding tubes, and 16 be outsourcing package, and 17 be screw type molybdenum electrode, and 18 be sealing ring, and 19 be support tube socket.

Specific embodiment

Below by conjunction with attached drawing, the present invention will be described in detail.

As shown in Figure 1, a kind of nuclear reactor annular fuel of the present invention damages experimental provision, including middle part soaking zone, middle part Soaking zone is multi-layer sleeve structure, and as shown in Figure 2, middle part soaking zone is fine by zirconia ceramic cylinder 1, zirconium dioxide from inside to outside It ties up thermal insulation layer 2 and outer layer stainless steel cooling cover 3 forms.Middle part soaking zone top is the gas that stainless steel cooling cover 4 is constituted The top cooling chamber that outlet pipe section, top upper end cover 7 and top lower cover 6 surround.The vertical section of gas vent pipeline section is equipped with Crestal gas injection mouth 5, the interior coolant that is equipped with of top upper end cover 7 are imported and exported.Middle part keeps the temperature pars infrasegmentalis and is connected to bottom water injection/gas chamber, Bottom water injection/gas chamber's connection admission line 8 and water inlet line 9, positioned at connection bottom water injection/gas chamber bottom bottom upper end The bottom coohng chamber that lid 10 and bottom lower cover 11 surround.Coolant is equipped in bottom lower cover 11 to import and export.Heat electrode 12 are built in bottom coohng chamber and top cooling chamber.Using threaded connection between each pipeline section, and use high-temperature seal adhesive Sealing.

Annular fuel is set in zirconia ceramic cylinder 1 and simulates stick 13, it is as shown in Figure 3 that annular fuel simulates stick structure.Its Efficient heat generation section is the tungsten-rhenium alloy pipe 14 that is surrounded by interior cladding tubes 15 and outsourcing package 16 of middle part, tungsten-rhenium alloy pipe 14 up and down End is connected with screw type molybdenum electrode 17, and the axial deformation that may occur for compensating tungsten-rhenium alloy pipe 14 prevents tungsten-rhenium alloy pipe Stiffness cracks.Tungsten-rhenium alloy pipe 14 and 17 surface of screw type molybdenum electrode are coated with one layer of insulating materials.Fever section passes through sealing Ring 18 seals, and fixed by support tube socket 19, and fever intersegmental part has poured a certain amount of Krypton, for prompting the failure of involucrum Temperature and out-of-service time.The form for supporting tube socket 19 is tripod-shaped, for fixing experimental section, and can guarantee water filling or gas injection When, fluid can be flowed through out of interior cladding tubes 15.It boxes out in one tube socket of sealing ring 18 and support tube socket 19, for drawing spiral shell Rotation type molybdenum electrode and be embedded in bottom coohng chamber and cooling chamber indoor heating electrode 12 in top is connected, screw type molybdenum electricity Pole 17 is sealed with sealing ring junction with sealant.

The length that annular fuel simulates stick 13 is 1.2m；Interior 15 inside radius of cladding tubes is 4.1mm, with a thickness of 0.57mm；Tungsten Rhenium alloys tube thickness is 2.225mm, and outsourcing package 16 is with a thickness of 0.74mm.Inside and outside cladding tubes 15 and 16 material of outsourcing package are Zirconium -4 alloy, sealing ring 18 and support 19 material of tube socket are zirconia ceramic.

Electric heater unit can be connected with heating electrode 12, and after heating electrode 12 is contacted with screw type molybdenum electrode 17, electric current is passed Tungsten-rhenium alloy pipe 14 is passed, tungsten-rhenium alloy pipe 14 generates heat for simulating decay heat.Entire electrical circuit is direct current electrical circuit, and is used The good material of electric conductivity, resistance is smaller, and electric current is larger, can prevent human electric shock.

When experiment carries out, annular fuel simulates the temperature at stick 13 and 1 different height of zirconia ceramic cylinder using adherent The Wolfram rhenium heat electric couple of arrangement carries out thermometric, and is recorded on computer in real time by capture card.Annular fuel simulates the hydrogen that stick generates Gas carries out real-time online measuring by the mass spectrograph being connected with gas vent pipeline section.

It is specific as follows the following detailed description of experimental method of the invention:

Entire experiment carries out on above-mentioned experimental provision, experiment needed before starting to all circuits, instrument and circuit into Row checks, guarantees the safety of experiment.

In warm-up phase, external argon gas source is injected after heating by the admission line 8 of bottom with the rate of 5g/s Experimental provision, the air in experimental provision is discharged.After the high temperature gas injection of 20min~40min, it is believed that entire experiment dress Air in setting all empties.

When the experimental stage, electric heater unit with heating copper electrode 12 be connected, heating power since 0kW with 0.1W/s~ The rate of 0.5W/s slowly rises until 7kW~10kW.Hereafter, according to the difference of experiment condition, it is different to test process: research nothing When oxygen environment operating condition, continuous heating is only needed until cladding tubes fusing inside and outside annular fuel simulation stick 13；Study steam oxidation operating condition When, it needs high-temperature steam out of, bottom 8 injection experiments device of admission line；When operating condition is flooded in research bottom, need cold But water is injected into experimental provision from the water inlet line 9 of bottom, while argon gas is changed with identical rate from 5 note of crestal gas injection mouth Enter, after water filling starts 10s~20s, heating power is quickly down to 0.2kW~0.3kW and is maintained until cooling water is injected into middle part Soaking zone top.

After experiment, by analyzing a series of experimental result, annular fuel oxidation, rupture, fusing and melting are disclosed The migratory behaviour mechanism of object, the exploitation for subsequent Analysis on Mechanism model provide data supporting, fill up the sky accordingly studied both at home and abroad It is white.

The present invention can be used in the damage experiment of annular fuel major accident.

The above content is a further detailed description of the present invention in conjunction with specific preferred embodiments, and it cannot be said that A specific embodiment of the invention is only limitted to this, for those of ordinary skill in the art to which the present invention belongs, is not taking off Under the premise of from present inventive concept, several simple deduction or replace can also be made, all shall be regarded as belonging to the present invention by institute Claims of submission determine scope of patent protection.