反应器系统LOCA动态分析模型研究

Shuai Liu
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引用次数: 0

摘要

反应器系统具有大规模的部件。而冷却剂损失事故的系统动力学分析模型包含了许多非线性因素。暂态计算分析耗时长,收敛性难以保证。本文建立了反应器回路系统的两种不同分析模型(全三回路模型和单回路模型)进行对比分析。分析表明,两种模型的主位置载荷计算误差在10%以内。喘振管与反应器进出口对系统动态特性的去耦影响在可接受范围内。当采用单回路模型时,需要对反应堆压力容器和稳压器进行解耦。并采用简化后的边界来模拟其对整个回路的影响。基于解耦准则的单回路动态分析模型可以大大减小计算规模并满足计算精度,可用于快速计算反应器系统的LOCA动态特性。该模型也可用于反应堆系统的地震分析。利用该模型进行反应堆系统动力学分析,可以大大提高计算效率。
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Research on LOCA Dynamic Analysis Model of Reactor System
The reactor system has a large scale of components. And the system dynamic analysis model for loss of coolant accidents (LOCA) contains many non-linear factors. The transient calculation analysis takes a long time and the convergence is difficult to guarantee. In this paper, two different analysis models (complete three-loop model and single-loop model) of the reactor loop system are established for comparative analysis. The analysis shows that the calculation error of the main position load in the two different model is within 10%. The decoupling influence of the surge tube and the reactor inlet and outlet on the system dynamic characteristics is within an acceptable range. When the single-loop model is used, it is necessary to decouple the reactor pressure vessel and pressurizer. And the simplified boundary is adapted to simulate its effect on the whole loop. The single-loop dynamic analysis model based on the decoupling criterion can greatly reduce the calculation scale and meet the calculation accuracy, which can be used to calculate the LOCA dynamic characteristics of the reactor system quickly. The model can also be used for seismic analysis of reactor system. And using this model for reactor system dynamic analysis can greatly improve the calculation efficiency.
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