Reactor three-dimensional power probability distribution monitoring method based on information fusion theory

Abstract

The invention provides a reactor three-dimensional power probability distribution monitoring method based on an information fusion theory. The reactor three-dimensional power probability distributionmonitoring method comprises the following steps: evaluating uncertainty of measurement information; determining adopted detector information based on the monitored dynamic or steady-state requirements; estimating a reactor power distribution state based on a Bayesian method; performing probability estimation of reactor core burn-up distribution; updating the probability of reactor core burnup distribution, and estimating the performance of the fuel rod in real time. According to the method, a detection information fusion method with different angles and different precisions is explored, basedon the Bayesian framework, information loss is reduced as much as possible, the matching problem of different angles and different precision measurements is solved, spatial distribution information with higher precision is obtained, probability distribution of power values of any point in a reactor core space is provided, and the probability distribution of the burnup value of any space point in the reactor core is further provided.

Description

technical field [0001] The invention belongs to the field of nuclear reactor operation monitoring, in particular to a reactor three-dimensional power probability distribution monitoring method based on information fusion theory. Background technique [0002] The core of reactor core condition monitoring is reactivity and power distribution monitoring. Changes in reactivity manifest as changes in overall power levels to reflect criticality safety. The change of spatial power distribution is one of the main causes of thermal safety problems. Various sensor systems are usually deployed to measure the core power distribution, including: (1) Zhang Hong proposed in "Daya Bay Nuclear Power Plant Core Power Distribution Measurement and Processing [D]" (Nuclear Science and Engineering. 1997 (17)) And the core movable detector system (MID), through the transmission device, the detectors usually arranged outside the reactor are moved into the reactor for measurement and then removed ...

AI Technical Summary

Problems solved by technology

From an information-theoretic point of view, only power distribution reconstruction via MID or FID constitutes a lack of information utilization

[0008] (2) Unable to determine the power uncertainty of any point in space

MID / FID can effectively estimate the current power distribution state, but this is only a single "best guess" that may appear, but it cannot be expressed as information in the probability space from the perspective of probability

Moreover, the uncertainty evaluation of the existing technology for the peak factor is difficult to extend to any position of the whole stack

Furthermore, the uncertainty of the fuel consumption distribution accumulated by the power distribution cannot be measured

[0009] (3) Unable to quantify the impact of detector failure on power uncertainty

However, nuclear power plants such as Daya Bay, Ling'ao, Yangjiang, and Fangchenggang have successively experienced cases where the actual number of channels is less than 40 due to probe jamming and channel blockage. At this time, there is no perfect theoretical framework to demonstrate the impact of the reduction in the number of channels, resulting in more conservative operating strategy without sacrificing economy

[0010] (4) It is impossible to quantify the impact of detector uncertainty changes on power uncertainty in real time

Images