NUCLEAR TECHNIQUES, Volume. 46, Issue 11, 110604(2023)
Development and analysis of a K-nearest-neighbor-based transient identification model for molten salt reactor systems
Figures & Tables(23)
Fig. 1. Development process of the system transient identification model
Fig. 2. KNN-based system transient identification model for the MSR system
Fig. 3. Framework of the KNN-based system transient identification model
Fig. 5. Hyper-parameter optimization results of the KNN-based system transient identification model
Fig. 6. Confusion matrix for the KNN-based system transient identification model
Fig. 8. Hyper-parameter optimization results of the system transient identification model trained on noisy data
Fig. 9. Confusion matrix for the KNN-based system transient identification model trained using noisy data on noiseless test datasets
Fig. 10. Confusion matrix for the KNN-based system transient identification model trained using noisy data on noisy test datasets
Fig. 11. Robustness test results of the system transient identification model trained on noisy data
Table 1. Hyper-parameters of KNN-based system transient identification model
View tableView in ArticleTable 1. Hyper-parameters of KNN-based system transient identification model
超参数Hyper-parameter 选取范围Range selected 邻近点数Number of neighbors [ 1 ~10 ]邻近点查找方法Algorithm to search neighbors [“auto”, “ball_tree”, “kd_tree”, “brute”] 距离计算方法Method to calculate distance [ 1 ,2 ]邻近点权重方式Method to weight neighbors [“uniform”, “distance”]
Table 2. MSRE operation condition type
View tableView in ArticleTable 2. MSRE operation condition type
运行工况Operation condition 详细描述Description NOR 稳态运行Steady state LOF_1 燃料泵故障Fuel circulating pump failure LOF_2 冷却剂泵故障Coolant circulating pump failure SBO 全场断电Station black out URW_1 1根控制棒误提升Uncontrolled withdrawal of 1 control rod URW_2 2根控制棒误提升Uncontrolled withdrawal of 2 control rods URW_3 3根控制棒误提升Uncontrolled withdrawal of 3 control rods FSL_hot 热段燃料盐泄漏Fuel salt leakage in hot leg FSL_cold 冷段燃料盐泄漏Fuel salt leakage in cold leg CSL_hot 热段冷却盐泄漏Coolant salt leakage in hot leg CSL_cold 冷段冷却盐泄漏Coolant salt leakage in cold leg
Table 3. Feature parameters of identification in MSR system
View tableView in ArticleTable 3. Feature parameters of identification in MSR system
特征参数Feature parameter 单位Unit 功率Power MW 堆芯出口温度Core outlet temperature K 堆芯进口温度Core inlet temperature K 二回路热段温度Secondary hot leg temperature K 二回路冷段温度Secondary cold leg temperature K 堆芯出口压力Core outlet pressure kPa 堆芯进口压力Core inlet pressure kPa 二回路热段压力Secondary hot leg pressure kPa 二回路冷段压力Secondary cold leg pressure kPa 燃料盐质量流量Fuel salt mass flow rate kg·s-1 冷却盐质量流量Coolant salt mass flow rate kg·s-1
Table 4. Binary classification results
View tableView in ArticleTable 4. Binary classification results
真实标签
True label
预测标签Predicted label 1 0 1 TP FN 0 FP TN
Table 5. Hyper-parameters optimization results of KNN-based system transient identification model
View tableView in ArticleTable 5. Hyper-parameters optimization results of KNN-based system transient identification model
超参数Hyper-parameter 优化结果Optimization results 邻近点数Number of neighbors 2 邻近点查找方法Algorithm to search neighbors “auto” 距离计算方法Method to calculate distance 1 邻近点权重方式Method to weight neighbors “distance”
Table 6. Test results of KNN-based identification models
View tableView in ArticleTable 6. Test results of KNN-based identification models
准确率
Accuracy
精确率
Precision
召回率
Recall
F1分数
F1-score
测试结果Test results 99.99% 99.99% 99.99% 99.99%
Table 7. F1-score of individual transient
View tableView in ArticleTable 7. F1-score of individual transient
运行工况
Operation condition
F1分数
F1-score / %
NOR 100.00 LOF 100.00 LOF_2 100.00 SBO 100.00 URW_1 100.00 URW_2 99.94 URW_3 99.94 FSL_hot 100.00 FSL_cold 100.00 CSL_hot 100.00 CSL_cold 100.00
Table 8. Results of system transient identification model under 30 dB SNR
View tableView in ArticleTable 8. Results of system transient identification model under 30 dB SNR
准确率
Accuracy
精确率
Precision
召回率
Recall
F1分数
F1-score
测试结果Test results 97.41% 94.47% 94.61% 94.31%
Table 9. Hyper-parameters optimization results of system transient identification model trained by data with noise
View tableView in ArticleTable 9. Hyper-parameters optimization results of system transient identification model trained by data with noise
超参数Hyper-parameter 优化结果Optimization results 邻近点数Number of neighbors 1 邻近点查找方法Algorithm to search neighbors “kd tree” 距离计算方法Method to calculate distance 2 邻近点权重方式Method to weight neighbors “uniform”
Table 10. Results of KNN-based system transient identification model trained by data with noise on noiseless test datasets
View tableView in ArticleTable 10. Results of KNN-based system transient identification model trained by data with noise on noiseless test datasets
准确率
Accuracy
精确率
Precision
召回率
Recall
F1分数
F1-score
测试结果Test results 99.69% 99.26% 99.22% 99.22%
Table 11. Results of KNN-based noise-added system transient identification model in test datasets
View tableView in ArticleTable 11. Results of KNN-based noise-added system transient identification model in test datasets
准确率
Accuracy
精确率
Precision
召回率
Recall
F1分数
F1-score
测试结果Test results 99.89% 99.73% 99.73% 99.73%
Table 12. F1-scores of individual transients using KNN-based system transient identification model trained by data with noise
View tableView in ArticleTable 12. F1-scores of individual transients using KNN-based system transient identification model trained by data with noise
运行工况
Operation condition
F1分数
F1-score / %
NOR 100.00 LOF 100.00 LOF_2 100.00 SBO 100.00 URW_1 99.61 URW_2 98.77 URW_3 98.62 FSL_hot 100.00 FSL_cold 100.00 CSL_hot 100.00 CSL_cold 100.00
Tools
Get Citation
Copy Citation Text
Tianze ZHOU, Kaicheng YU, Maosong CHENG, Zhimin DAI. Development and analysis of a K-nearest-neighbor-based transient identification model for molten salt reactor systems[J]. NUCLEAR TECHNIQUES, 2023, 46(11): 110604
Paper Information
Category: Research Articles
Received: Apr. 24, 2023
Accepted: --
Published Online: Dec. 23, 2023
The Author Email:
© Copyright 2018-2021 | Chinese Laser Press.
All Rights Reserved 沪ICP备15018463号-20