Abstract
As the nuclear power plant containment is the third barrier to nuclear safety, real-time monitoring of containment leakage rate is very important in addition to the overall leakage test before an operation. At present, most of the containment leakage rate monitoring systems calculate the standard volume of moist air in the containment through monitoring parameters and calculate the daily leakage rate by the least square method. This method requires several days of data accumulation to accurately calculate. In this article, a new leakage rate modeling technique is proposed using a convolutional neural network based on data of the monitoring system. Use the daily monitoring parameters of nuclear power plants to construct inputs of the model and train the convolutional neural network with daily leakage rates as labels. This model makes use of the powerful nonlinear fitting ability of the convolutional neural network. It can use 1-day data to accurately calculate the containment leakage rate during the reactor start-up phase and can timely determine whether the containment leak has occurred during the start-up phase and deal with it in time, to ensure the integrity of the third barrier.
Highlights
In a nuclear power plant, the pressure boundary formed by the containment body and numerous perforated equipment, components and pipes that penetrate the body is the third and last barrier of a nuclear power plant (Sakaba et al, 2004)
Based on the above reasons, this paper proposes a convolutional neural network (CNN) method to estimate the containment leakage rate during the reactor start-up phase
This work proposes a containment leakage rate estimation framework based on CNN
Summary
In a nuclear power plant, the pressure boundary formed by the containment body and numerous perforated equipment, components and pipes that penetrate the body is the third and last barrier of a nuclear power plant (Sakaba et al, 2004) It is responsible for the important function of preventing radioactive materials from leaking into the external environment. The Safety Guide published by the International Atomic Energy Agency describes in detail the safety function requirements of the containment of radioactive materials under reactor operation and accident conditions It emphasizes that the integrity of the containment structure should be maintained under design basis accidents, and the leakage rate cannot exceed the specified maximum value. When the leakage rate reaches the operation limit, the operator is informed to take necessary measures action
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