Reactor core power proper orthogonal decomposition online reconstruction method

Abstract

The invention discloses a reactor core power proper orthogonal decomposition online reconstruction method. The method includes: reading the neutron detector measured value of a reactor core at the current moment; reading the reactor core tracking calculation power distribution of the reactor core at the current moment and the previous moment; selecting the power distribution for proper orthogonaldecomposition to form a proper orthogonal decomposition sample; performing proper orthogonal decomposition on the proper orthogonal decomposition sample to obtain a proper orthogonal basis; using theorthogonal basis function to perform function expansion on to-be-reconstructed reactor core power distribution; solving an expansion coefficient according to the read neutron detector measured value;calculating a reactor core power distribution reconstruction value according to the expansion coefficient and the proper orthogonal basis. The method has the advantages that by applying the proper orthogonal decomposition technology and the reactor core power distribution of reactor core tracking calculation at different moments, the calculation precision of reactor core power distribution onlinereconstruction is increased, and the decisive influence of the neutron diffusion calculation result on the reactor core power distribution online reconstruction result is lowered evidently.

Description

technical field [0001] The invention relates to the technical field of nuclear reactor core operation and safety, in particular to an online reconfiguration method based on tracking calculation for intrinsic orthogonal decomposition of core power. Background technique [0002] On-line monitoring of nuclear reactor core power distribution is of great significance to ensure the safety of the reactor core and improve the economic benefits of nuclear power plants. But the core power distribution is not a direct monitoring quantity, but the core power distribution is measured indirectly through the measurement of the neutron flux density. In order to measure the neutron flux density of the core in real time, neutron detectors are installed inside or outside the reactor, but these neutron detectors are only arranged at specific positions and the number is limited, so to achieve spatially continuous power distribution For real-time monitoring, it is very necessary to study the onl...

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Problems solved by technology

[0006] But, the methods described in these invention patents and published papers of the prior art all need online (or offline) solution for a current core state (or with The neutron diffusion equation (or neutron transport equation) in the current core state similar to the state) can obtain a spatially continuous power distribution (or neutron flux distribution); this not only produces a large amount of calculation, but also greatly increases The calculation time is shortened, and only the predicted value of the power distribution (or neutron flux distribution) in one core state can be considered in the online reconstruction calculation of the core power distribution. The requirement that the corresponding core state should be consistent with or close to the core state to be reconfigured caused the core power distribution (or neutron flux distribution) calculated by neutron diffusion (or transport) to be different from the real core state. The deviation between the power distribution (or neutron flux distribution) directly determines the accuracy of the online reconstruction calculation of the core power distribution, which is obviously unreasonable

[0007] Therefore, the existing technology still needs to be improved and developed

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