CN-119681576-B - Nuclear reactor double-cone metal sealing ring manufacturing and checking method

Abstract

The invention belongs to the technical field of manufacturing and inspection of sealing elements, and particularly relates to a manufacturing and inspection method of a double-cone metal sealing ring of a nuclear reactor. A method for manufacturing and checking double-cone metal sealing ring of nuclear reactor includes such steps as preparing plate material in predefined size, turning front end surface, turning back end surface, testing hardness, air tightness, water pressure and thermal cycle, and testing the performance of double-cone metal sealing ring by means of the evaluation criteria of hardness, air tightness, water pressure and thermal cycle.

Inventors

• SHEN JIAWEI
• HE JIAHUAN
• DU KAI
• ZHONG BOLING
• WU XIAOLONG
• ZHU CHANGRONG
• FAN WEIFENG
• CHENG LONG
• YU SHOUJI
• MENG WEIMIN
• LU SHAOWEI
• NIE WENZHE
• DENG YANCHAO
• GUO LIANG

Assignees

• 中核核电运行管理有限公司

Dates

Publication Date

20260512

Application Date

20230922

Claims (6)

1. 1. A method for manufacturing and inspecting a double-cone metal sealing ring of a nuclear reactor is characterized by comprising the following steps: s110, preparing materials, namely preparing a plate material with a preset size; S120, turning a positive end face; s121, clamping one end of the plate material by using a clamp; S122, boring an inner hole to a preset size; s123, turning the outer diameter of the disc (110) to a preset size; S124, turning the spherical surface (120) to a preset size; s130, turning a reverse end face; s131, clamping the disc (110) by using a clamp; s132, an on-board spherical surface (120) and the total length of the on-board spherical surface reaches a preset size; S210, performing hardness, air tightness, water pressure and thermal cycle test detection on the manufactured double-cone metal sealing ring; S211 hardness test Selecting a biconical metal sealing ring for hardness test, and referring to GB/T4340.1-2009 (Vickers hardness test part 1: test method for metal materials), clamping a sample on a bench vice during the test, enabling the axis of a pressure head to be vertical to the surface of the sample, rotating a load selection hand wheel to HV0.01 and selecting a load of 0.098N, operating a cross workbench through eyepiece observation, selecting a proper loading point, and then starting a program for Vickers hardness detection, wherein Vickers hardness HV1 is taken as an evaluation basis, and HV1 is more than or equal to 335 is regarded as qualified test; s212 test of air tightness The gas tightness test uses a double-cone metal seal ring gas tightness test tool and a double-cone metal seal ring gas tightness test device, and the leakage rate of helium gas leaked from the double-cone metal seal ring is measured by a helium mass spectrometer leak detector, wherein the leakage rate is less than or equal to 10 -6 Pa.m 3 /s and is regarded as qualified test; S213 hydrostatic test The hydraulic test uses a double-cone metal sealing ring hydraulic test tool and a double-cone metal sealing ring hydraulic test system, and under the maximum water pressure of 25.8MPa, the sealing condition of the double-cone metal sealing ring is checked, and no visible leakage and the pressure drop of not more than 0.1MPa are regarded as qualified; s214 thermal cycle test The thermal cycle test uses a double-cone metal sealing ring thermal cycle test tool and a double-cone metal sealing ring thermal cycle test system, and the thermal state working conditions of the temperature of more than or equal to 310 ℃ and the pressure of more than or equal to 15.5MPa are adopted, and the thermal cycle test is carried out for five times, so that no visible leakage is regarded as the qualification of the test.
2. 2. The method of manufacturing and inspecting a double-cone metal seal ring of a nuclear reactor according to claim 1, wherein in step S110, the plate material is a disc with a diameter of phi 110x22 mm.
3. 3. The method for manufacturing and inspecting a double-cone metal seal ring of a nuclear reactor according to claim 1, wherein the diameter of the drilling and boring inner hole in step S122 is phi 77.8mm.
4. 4. The method for manufacturing and inspecting a double-cone metal seal ring of a nuclear reactor according to claim 1, wherein the outer diameter of the turning disc (110) in the step S123 is phi 107.95mm.
5. 5. The method for manufacturing and inspecting a double-cone metal seal ring of a nuclear reactor according to claim 1, wherein the outer diameter of the upper spherical surface (120) is phi 84.3 mm-phi 84.4mm, and the height of the upper spherical surface (120) is 6.35 mm-6.36 mm.
6. 6. The method for manufacturing and testing the double-cone metal sealing ring of the nuclear reactor, which is disclosed in claim 1, is characterized in that the plate comprises, by mass, less than or equal to 0.07% of carbon, 15% -17.5% of chromium, 3% -5% of nickel, less than or equal to 1% of silicon, less than or equal to 1% of manganese, less than or equal to 0.03% of sulfur, less than or equal to 0.04% of phosphorus, 3% -5% of copper, 0.15% -0.45% of niobium, and the balance of iron.

Description

Nuclear reactor double-cone metal sealing ring manufacturing and checking method Technical Field The invention belongs to the technical field of manufacturing and inspection of sealing elements, and particularly relates to a manufacturing and inspection method of a double-cone metal sealing ring of a nuclear reactor. Background The mechanical sealing device of the nuclear reactor pressure vessel thermocouple is an important device of a main system of a pressurized water reactor nuclear motor unit, and is a loop pressure boundary, and the main function of the mechanical sealing device is to maintain the integrity of the loop pressure boundary. The pressure vessel bears the actions of high temperature (more than or equal to 310 ℃) of boric acid water in a loop, high pressure (more than or equal to 15.5 MPa) and water flow impact during the operation of the nuclear reactor. The mechanical sealing device for the thermocouple mainly comprises mechanical parts such as a bowl-shaped metal sealing ring, a double-cone-shaped metal sealing ring, a male flange, a clamp and the like. The double-cone metal sealing ring faces working conditions of high temperature, high pressure and large vibration, so that the sealing effect is obviously attenuated, and the normal use requirement of the mechanical sealing device of the thermocouple of the nuclear reactor pressure vessel is difficult to meet. Disclosure of Invention The invention aims to solve the technical problems in the prior art, and provides a method for manufacturing and checking a double-cone metal sealing ring of a nuclear reactor, which ensures that the finished product meets the working condition requirement through improvement of a manufacturing process and strict defect checking of the finished product. In order to solve the problems, the technical scheme of the invention is as follows, a manufacturing and checking method of a double-cone metal sealing ring of a nuclear reactor, which comprises the following steps: s110, preparing materials, namely preparing a plate material with a preset size; S120, turning a positive end face; s121, clamping one end of the plate material by using a clamp; S122, boring an inner hole to a preset size; S123, turning the outer diameter of the disc to a preset size; s124, turning the spherical surface to a preset size; s130, turning a reverse end face; s131, clamping the disc by using a clamp; S132, turning the spherical surface and the total length to a preset size; S210, performing hardness, air tightness, water pressure and thermal cycle test detection on the manufactured double-cone metal sealing ring; S211 hardness test Selecting a biconical metal sealing ring for hardness test, and referring to GB/T4340.1-2009 (Vickers hardness test part 1: test method for metal materials), clamping a sample on a bench vice during the test, enabling the axis of a pressure head to be vertical to the surface of the sample, rotating a load selection hand wheel to HV0.01 and selecting a load of 0.098N, operating a cross workbench through eyepiece observation, selecting a proper loading point, and then starting a program for Vickers hardness detection, wherein Vickers hardness HV1 is taken as an evaluation basis, and HV1 is more than or equal to 335 is regarded as qualified test; s212 test of air tightness The leakage rate of helium gas leaked from the double-cone metal sealing ring is measured by a helium mass spectrometer leak detector, and the leakage rate is less than or equal to 10 < -6 > Pa.m3/s and is regarded as qualified; S213 hydrostatic test The hydraulic test uses a double-cone metal sealing ring hydraulic test tool and a double-cone metal sealing ring hydraulic test system, and under the maximum water pressure of 25.8MPa, the sealing condition of the double-cone metal sealing ring is checked, and no visible leakage and the pressure drop of not more than 0.1MPa are regarded as qualified; s214 thermal cycle test The thermal cycle test uses a double-cone metal sealing ring thermal cycle test tool and a double-cone metal sealing ring thermal cycle test system, and the thermal state working conditions of the temperature of more than or equal to 310 ℃ and the pressure of more than or equal to 15.5MPa are adopted, and the thermal cycle test is carried out for five times, so that no visible leakage is regarded as the qualification of the test. In step S110, the plate material is a disc with phi 110x22 mm. In step S121, the clamp clamps the disc part to have an extension direction of 6mm from one end to the other end. And S122, drilling and boring the inner hole with the diameter of phi 77.8mm. The outer diameter of the turning disc in the step S123 is phi 107.95mm. The outer diameter of the upper spherical surface is phi 84.3 mm-phi 84.4mm, and the height of the upper spherical surface is 6.35 mm-6.36 mm. The plate comprises, by mass, not more than 0.07% of carbon, 15% -17.5% of chromium, 3% -5% of nickel, not more than 1% of silicon, not