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- W4376850115 abstract "The fuel damage fraction is a key parameter of performance for pressurized water reactor under Condition III and IV transients. Usually, the amount of fuel rods experiencing departure from nuclear boiling (DNB) is calculated to represent the Fuel Damage Fraction. The conventional method only calculates the amount of fuel rods experiencing DNB at the minimum departure from nuclear boiling ratio (DNBR) reached moment using subchannel analysis model. This article reviews the simplifying assumptions of this method, points out that only calculating the minimum DNBR reached moment is not appropriate. Since the calculation of fuel damage fraction requires the calculation of critical fuel rod power rate of the moment which contains iterations, the calculation of a series of moments would be complicated. An improved method is presented which can not only ensure the result is conservative but also do not increase the computational complexity. The increased method adds a checking step after the calculation of fuel rod critical power at the minimum DNBR reached moment. It verifies whether the critical power is conservative in any other moments. If a fuel rod of critical power experiences DNB in any other moment, the critical power at that moment should be recalculated. The newly calculated critical power should be check again by the checking step. At last, the fuel damage fraction should be calculated with this checked critical power. Compared to the calculation of fuel damage fraction in every moment of the accident, the number of times of the critical power calculation is effectively reduced. In this way, the result would be conservative and the complexity of calculation is acceptable." @default.
- W4376850115 created "2023-05-18" @default.
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- W4376850115 date "2023-01-01" @default.
- W4376850115 modified "2023-09-28" @default.
- W4376850115 title "The Analysis and Improvement of Fuel Damage Fraction Calculate" @default.
- W4376850115 cites W2027997274 @default.
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- W4376850115 doi "https://doi.org/10.1007/978-981-19-8780-9_7" @default.
- W4376850115 hasPublicationYear "2023" @default.
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