Unlock instant, AI-driven research and patent intelligence for your innovation.

A method for judging the number of damaged fuel cladding of wwer units

A damage and cladding technology is applied in the field of analysis of the damage of components in the core of the WWER unit of a nuclear power plant, and achieves the effect of obvious change trend, easy judgment and wide judgment range.

Active Publication Date: 2021-09-17
CHINA NUCLEAR POWER ENG CO LTD
View PDF4 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is no mature method for judging the damage of fuel rod cladding

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A method for judging the number of damaged fuel cladding of wwer units

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0043] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0044] In the actual operation of nuclear power plants, the probability of a small number of fuel rods to produce microcracks or damage is much higher than the probability of multiple fuel rods to produce microcracks or damage at the same time. The smaller the number, the more detailed the classification; on the contrary, the more the number of leaked fuel rods, the simpler the classification, as shown in Table 1.

[0045] Table 1 Classification of fuel rod leakage conditions

[0046] Number of Microcrack Rods Number of broken rods Whether to consider uranium contamination Class 1 0 0 yes Class 2 1 0 yes Class 3 0 1 yes Class 4 2 0 yes Class 5 0 2 yes Class 6 4 0 yes Class 7 0 4 yes Class 8 7 0 yes Class 9 0 7 yes Class 10 12 0 yes Class 11 0 ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention belongs to the technical field of damage analysis of components in the core of a nuclear power plant WWER unit, and specifically relates to a method for judging the number of damaged fuel rod claddings of a WWER pressurized water reactor nuclear power unit. The steps include: S1 establishing and displaying the first nuclide in the main circuit, The declassification diagram of the second nuclide, with the activity concentration of the first nuclide as the ordinate; the ratio of the activity concentrations of the first nuclide and the second nuclide as the abscissa; S2 according to the fuel rod declassification process In the abscissa and ordinate ranges of the confidentiality classification diagram, set the safety frame, damage frame, and microcrack frame; S3 is based on the activity concentration of the first nuclide in the main circuit, and the first nuclide The ratio of the activity concentration of the nuclide and the second nuclide, and draw the corresponding schematic points on the classification map; S4 judge the number of fuel rods whose cladding is damaged or micro-cracked according to the position of the schematic points. This method can more accurately judge the number of fuel rods with damage or micro-cracks.

Description

technical field [0001] The invention belongs to the technical field of damage analysis of components in the core of a WWER unit of a nuclear power plant, and in particular relates to a method for judging the number of damaged fuel claddings of a WWER unit. Background technique [0002] In the normal operation of a nuclear power plant, even if the integrity of the fuel rod cladding in the reactor is lost, if the activity of the fission product in the main circuit does not exceed the operating limit, the operation can still continue, but the damage to the fuel rod cladding is required. assess the situation. However, there is no mature method for judging the damage of fuel rod cladding. Contents of the invention [0003] The invention aims at calculating the specific activity of radioactivity of primary circuit coolant under different cladding damage assumptions, quantifying the situation of component damage, and predicting the damage situation of components in the core. Th...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): G21C17/06G21C17/07
CPCG21C17/06G21C17/07Y02E30/30
Inventor 张晔杨德锋尤伟王晓霞米爱军邱林
Owner CHINA NUCLEAR POWER ENG CO LTD