Judgement method for quantity of fuel cladding failure of WWER set
A damage and cladding technology, which is applied in nuclear reactor monitoring, reactors, nuclear power generation, etc., to achieve obvious changing trends, accurate judgments, and a wide range of judgments
Active Publication Date: 2018-11-20
CHINA NUCLEAR POWER ENG CO LTD
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Problems solved by technology
However, there is no mature method for judging the damage of fuel rod cladding
Method used
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[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 ...
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The invention belongs to the technical field of damage condition analysis of core inner components of a WWER set of a nuclear power plant, and particularly relates to an judgement method for a quantity of fuel rod cladding failure of a WWER pressurized water reactor nuclear power set. The method includes the following steps: S1 establishing a confidentinosity grading chart displaying a first nuclide and a second nuclide in a main loop, taking radioactivity activity concentration of the first nuclide as an ordinate, and taking ratio values of the radioactivity activity concentration of the first nuclide the second nuclide as an abscissa; S2 setting a safety schematic frame, a damage schematic frame, and a micro-crack schematic frame in ranges of the abscissa and the ordinate of the confidentinosity grading chart according to a fuel rod confidentinosity condition grading table; S3 drafting corresponding schematic points in the confidentinosity grading chart according to the radioactivityactivity concentration of the first nuclide, and the ratio values of the radioactivity activity concentration of the first nuclide the second nuclide; and S4 judging the quantity of fuel rods with failure or micro-cracked claddings according to positions of the schematic points. The method can more accurately judge the quantity of the fuel rods that are damaged or slightly cracked.
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...
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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