Development and Validation of DNBR On-line Monitoring System for HPR1000 Reactor
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摘要: 传统的二代反应堆保护系统一般采用超温ΔT保护信号，这种保护方法比较保守，且属于间接方式，而偏离泡核沸腾比（DNBR）在线监测软件能够直接监督安全参数的变化。为了更直观地实时掌握华龙一号反应堆堆芯的安全裕量，进一步提高反应堆安全运行的灵活性，本文从压水堆堆芯的热工设计基础模型出发，提出了兼顾计算速度和求解精度的DNBR在线监测热工计算模型，开发了一套可用于华龙一号反应堆的DNBR在线监测系统，并从堆芯独立验证、模拟信号验证、华龙一号首堆实堆运行数据验证等三个方面对在线监测系统的计算模型进行了充分验证。结果表明，DNBR在线监测系统计算精度较高，与自主化子通道程序相当，能够满足华龙一号反应堆工程设计的需求。
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关键词:
- 华龙一号 /
- 偏离泡核沸腾比（DNBR） /
- 在线监测
Abstract: In the traditional protection system of generation II reactor, over-temperature protection signal is usually used. This protection method is conservative and indirect, however, the Departure from Nucleate Boiling Ratio (DNBR) on-line monitoring system can directly monitor the changes of safety parameters. In order to directly monitor the safety margin of Hualong Pressurized Reactor (HPR1000) and improve the flexibility of reactor safety operation, this paper puts forward a DNBR on-line monitoring calculation model with both calculation speed and solution accuracy based on the basic model of thermal design of PWR core, and develops a set of DNBR on-line monitoring system for HPR1000. The calculation model of on-line monitoring system is fully verified from three aspects: independent verification of core, verification of analog signal and verification of actual operation data of HPR1000. The results demonstrate that the precision of the on-line monitoring system is very high, and equvalent with the sub-channel code. In conclusion, the DNBR on-line monitoring system could satisfy the needs of HPR1000 engineering design. -
图 1 全堆芯mDNBR分布趋势
F△H—焓升热通道因子；Fq—热流密度热通道因子
Figure 1. Minimum DNBR Distribution Trend of Overall Core
图 4 子通道程序与在线监测软件mDNBR偏差对比
Figure 4. Deviation of the Minimum DNBR between On-line Monitoring and Sub-channel Software
图 5 在线监测软件与子通道程序mDNBR计算结果的相对偏差直方图
Figure 5. Histogram of Relative Deviation of the Minimum DNBR between On-line Monitoring and Sub-channel Software
图 6 工况18的轴向DNBR计算结果对比
Figure 6. Comparison of Axial DNBR Calculation Results under Condition 18
表 1 mDNBR对比验证结果
Table 1. Results of the Minimum DNBR Validation
工况编号 在线监测软件计算结果 子通道程序计算结果 相对偏差/% 1 2.144 2.177 −1.52 2 1.930 1.963 −1.70 3 1.286 1.270 1.23 4 1.126 1.143 −1.48 5 1.381 1.362 1.39 6 1.301 1.256 3.60 7 1.364 1.408 −3.17 8 1.279 1.311 −2.43 9 1.507 1.514 −0.50 10 2.464 2.412 0.80 11 2.253 2.328 −3.23 12 2.174 2.241 −2.98 13 2.123 2.194 −3.22 14 1.730 1.760 −1.74 15 1.740 1.772 −1.77 16 1.832 1.859 −1.46 17 1.502 1.554 −3.34 18 1.573 1.622 −3.02 
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表 2 模拟电流信号验证的DNBR计算结果对比
Table 2. Comparison of DNBR Results for Digital Simulation Test Validation
物理含义 例题编号 1 2 3 4 功率水平/%FP 100 65 100 100 稳压器压力/MPa 15.51 15.51 15.51 15.51 冷却剂流量/(m3 ·h−1) 74040 74040 74040 74040 堆入口温度/℃ 292.1 291.96 292.1 292.1 堆出口温度/℃ 327.9 316.2 327.9 327.9 控制棒状态 ARO 65%FP水平刻度位置 ARO ARO 在线监测软件mDNBR 3.356 4.648 3.776 4.036 子通道程序mDNBR 3.329 4.709 3.823 3.954 DNBR相对偏差/% 0.811 −1.295 −1.229 2.074 ARO—控制棒全提；FP—满功率
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表 3 实堆调试验证mDNBR计算结果对比
Table 3. Comparisons of Minimum DNBR Results for Real Reactor Operation
功率/%FP mDNBR计算结果 在线监测软件 子通道程序 相对偏差/% 50 7.340 7.251 1.22 100 3.560 3.491 1.95
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