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A Method for Quickly Restoring the Impact Toughness of Aging Nuclear Reactor Pressure Vessels

A technology for pressure vessels and nuclear reactors, applied in the field of rapidly reducing the number density of nanoclusters and restoring the impact toughness of aging pressure vessels, can solve the problems of high working temperature, complicated operation, expensive equipment, etc. The effect of reducing energy consumption

Active Publication Date: 2020-12-22
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The two annealing heat treatment methods have their own advantages and disadvantages, but both are expensive in equipment, complicated in operation, long in cycle, and high in working conditions, which do not meet the requirements of the current industrial green development plan

Method used

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  • A Method for Quickly Restoring the Impact Toughness of Aging Nuclear Reactor Pressure Vessels
  • A Method for Quickly Restoring the Impact Toughness of Aging Nuclear Reactor Pressure Vessels
  • A Method for Quickly Restoring the Impact Toughness of Aging Nuclear Reactor Pressure Vessels

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] In this embodiment, the pulse current treatment is performed on the small-sized aging simulated steel. Specific steps are as follows:

[0021] Step 1: Make pulsed samples. Take a 25mm×5mm×0.5mm aging sample, and polish the surface with 600, 1500, and 2000-grit sandpaper in turn until there are no visible defects to ensure good contact with the pulse electrode.

[0022] Step 2: Determine the pulse processing parameters. The parameter range of the pulse current is set, and the pulse current parameters are determined to be 400Hz, 190μs, 100A, and the action time is 15min.

[0023] The third step: pulse current treatment. Fix the small-sized sample after grinding on the output end of the pulse power supply with a fixture, and perform pulse current treatment on it for 15 minutes at room temperature.

[0024] Step 4: Observing the distribution of copper-rich nanoclusters with a transmission electron microscope. Take the arbitrary position of the aging sample and the 10mm...

Embodiment 2

[0027] In this embodiment, the pulse current treatment is performed on the small-sized aging simulated steel. Specific steps are as follows:

[0028] Step 1: Make pulsed samples. Take a 25mm×5mm×0.5mm aging sample, and polish the surface with 600, 1500, and 2000-grit sandpaper in turn until there are no visible defects to ensure good contact with the pulse electrode.

[0029] Step 2: Determine the pulse processing parameters. The parameter range of the pulse current is set, and the pulse current parameters are determined to be 800Hz, 55μs, 200A, and the action time is 15min.

[0030] The third step: pulse current treatment. Fix the small-sized sample after grinding on the output end of the pulse power supply with a fixture, and perform pulse current treatment on it for 15 minutes at room temperature.

[0031] Step 4: Observing the distribution of copper-rich nanoclusters with a transmission electron microscope. Take the arbitrary position of the aging sample and the 10mm ...

Embodiment 3

[0034] In this embodiment, the pulse current treatment is performed on the large-scale aging simulated steel. Specific steps are as follows:

[0035] Step 1: Make pulsed samples. Take a 55mm×10mm×6mm aging sample, and polish the surface with 600, 1500, and 2000-grit sandpaper in sequence until there are no visible defects to ensure good contact with the pulse electrode.

[0036] Step 2: Determine the pulse processing parameters. Set the parameter range of the pulse current, and determine the pulse current parameters as 195Hz, 195μs, 200A, and the action time is 60min.

[0037] The third step: pulse current treatment. The polished sample was fixed on the output end of the pulse power supply with a fixture, and it was subjected to pulse current treatment for 60 min at room temperature.

[0038] Step 4: Observing the distribution of copper-rich nanoclusters with a transmission electron microscope. Take the arbitrary position of the aging sample and the 10mm area of ​​the cen...

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Abstract

The invention relates to a method of rapidly restoring the impact toughness of an aged nuclear reactor pressure vessel and belongs to the technical field of life prolonging of nuclear reactor pressurevessels. In the method, aged pressure vessel simulation steel is connected with a pulse power supply through a wire, a pulse current is continuously applied with a corresponding time, and a proper pulse current processing parameter is selected according to the embrittlement degree and the size of a sample, wherein the pulse processing parameter range is as follows: the frequency is 1-1000Hz, thepulse width is 10 microseconds-1 millisecond, the current is 10-3000A, and the action time is 1min-20h. By adopting the method disclosed by the invention, external field treatment can be performed ona hard and brittle nuclear reactor pressure vessel in situ under the condition that a temperature of a loop coolant is not adjusted, a reactor core is not moved for arranging extra heat source assistance, so that the number density of copper-rich nanoclusters in a matrix is greatly lowered, and the impact toughness of the aged pressure vessel is restored to the maximum. The method is short in treatment time and low in temperature, can greatly lower energy consumption and accords with the requirements for current industrial green development planning.

Description

technical field [0001] The invention belongs to the technical field of life extension of nuclear reactor pressure vessels, and in particular relates to a method for rapidly reducing the number density of nano-clusters and restoring the impact toughness of aging pressure vessels through pulsed current. Background technique [0002] The pressure vessel is one of the core structural materials of the nuclear reactor and the most important barrier to prevent nuclear leakage. Due to its huge size and irreplaceability, its service life directly determines the operating time of the nuclear power plant. However, high temperature, high pressure, and high-energy neutron irradiation during the service process cause high-density nanoscale copper-rich clusters, vacancies, dislocation loops and other defects in the pressure vessel matrix to increase its hardness and strength, and seriously deteriorate the impact toughness. The hidden danger of failure caused by irradiation will eventually...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D10/00
CPCC21D10/00
Inventor 张新房秦书洋巴鑫
Owner UNIV OF SCI & TECH BEIJING
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