Online reconstruction method for transient three-dimensional power distribution of reactor core

Abstract

The invention discloses an on-line reconstruction method for transient three-dimensional power distribution of a reactor core. The method comprises the following steps: calculating power distributionof the reactor core at different time points under different transient conditions and measured values of an out-of-reactor neutron detector; calculating a proportional function of an out-of-reactor neutron detector; acquiring a transient type and a time point of the reactor core in a current state; selecting an out-of-reactor neutron detector proportional function of the reactor core in the current state; acquiring a measured value of an out-of-reactor neutron detector of the reactor core in the current state; calculating a transient three-dimensional power distribution online reconstruction value of the reactor core by combining a proportional function of an out-of-reactor neutron detector; carrying out on-line reconstruction calculation of transient three-dimensional power distribution of the reactor core by combining measured values of the out-of-reactor detector according to proportional functions of the out-of-reactor detector at different transient states and different time points of the reactor core, so that the problem of lack of three-dimensional power distribution change of the reactor core in a transient process when the reactor core recovers operation after a transientworking condition is solved; and the real-time performance of a measured value is ensured by the out-of-pile detector, and the calculation speed is also ensured by a proportional function prepared beforehand.

Description

technical field [0001] The invention relates to the technical field of core operation and safety of nuclear reactors, in particular to an online reconfiguration method for transient three-dimensional power distribution of the core. Background technique [0002] The core power distribution of a nuclear reactor is an important input parameter for the calculation of the core safety margin. The online monitoring of the core power distribution can not only provide the operator with a reference The calculation of core fuel assembly burnup provides input parameters; it can be seen that the on-line monitoring of core power distribution is of great significance to ensure the safety of the reactor core and improve the economic efficiency of nuclear power plants. [0003] For this reason, since the 1960s, various nuclear power companies have successively developed monitoring systems suitable for different reactor types. The algorithms involved mainly include: harmonic expansion method,...

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Problems solved by technology

[0003] For this reason, since the 1960s, various nuclear power companies have successively developed monitoring systems suitable for different reactor types. The algorithms involved mainly include: harmonic expansion method, spline function fitting method, least square method, coupling coefficient method, Kriging method, etc.; however, in the transient process, it is more concerned about whether the core can be shut down safely and whether the core is in a safe state, so the existing monitoring system and its algorithm are mainly researched and developed for the stable operation state of the core. The applicability to the transient condition of the core needs to be further studied; in fact, the core needs to resume operation after the transient condition, and at this time, the three-dimensional power distribution changes of the core during the transient process are missing; therefore , it is necessary to study an online reconstruction method for the transient three-dimensional power distribution of the core

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