Analysis and Verification of LOCUST Based on SGTR Accident of DOEL-2
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摘要: 蒸汽发生器传热管破裂（SGTR）事故会导致一、二回路热工水力参数大幅波动，严重危害反应堆的安全性，使用国内研发的热工水力系统分析软件LOCUST可以计算SGTR事故中的热工水力参数并预测事故进程。本研究以DOEL-2电厂SGTR事故为研究对象，以热工水力系统分析软件LOCUST为计算工具，对DOEL-2电厂进行建模计算，并将计算结果与RELAP5计算结果及实际数据进行对比，评估LOCUST软件对SGTR事故预测的准确性。研究表明，LOCUST软件能够很好地预测SGTR事故过程，计算得到的一回路及二回路相关参数与RELAP5计算结果和实际数据吻合较好，本研究可为LOCUST软件验证提供数据支撑。
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关键词:
- DOEL-2电厂 /
- 蒸汽发生器传热管破裂（SGTR） /
- LOCUST /
- 数据验证
Abstract: The steam generator tube rupture (SGTR) accident will cause significant fluctuations in the thermal and hydraulic parameters of the primary and secondary circuits, seriously endangering reactor safety. The thermal and hydraulic system analysis software LOCUST developed in China can be used to calculate the thermal and hydraulic parameters in the SGTR accident and predict the accident process. This study takes the SGTR accident of DOEL-2 power plant as the research object, and uses the LOCUST as the calculation tool to model and calculate the DOEL-2 power plant. The calculation results are compared with the RELAP5 calculation results and actual data to evaluate the accuracy of LOCUST software in predicting SGTR accidents. It shows that the LOCUST can effectively predict the SGTR accident process, and the calculated parameters of the primary and secondary circuits are in good agreement with the RELAP5 calculation results and actual data. This study can provide data support for the verification of LOCUST. -
图 15 A环路冷管道取水喷淋流量变化
Figure 15. Change of Cold Leg Intake Spray Mass Flow Rate of Loop A
图 16 B环路冷管段取水喷淋流量变化
Figure 16. Change of Cold Leg Intake Spray Mass Flow Rate of Loop B
表 1 压力容器主要参数
Table 1. Main Parameters of Pressure Vessel
参数名 参数值 下降段长度/mm 4084 下降段环腔宽度/mm 600 下降段流动面积/m2 1.41 下封头体积/m3 2.679 下腔室体积/m3 8.933 上封头体积/m3 8.832 上腔室体积/m3 2.04 
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表 2 SG主要参数
Table 2. Main Parameters of Steam Generator
参数名 参数值 U型管数量/根 3260 U型管平均长度/m 18.16 U型管外径/mm 22.2 U型管内径/mm 19.6 U型管壁面厚度/mm 2.6 换热面积/m2 4130 U型管流通面积/m2 0.99 进口腔室体积/m3 4.393 出口腔室体积/m3 4.393
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表 3 DOEL-2水力学部件类型
Table 3. Types of Hydraulic Components for DOEL-2
部件类型 符号 环管部件 ANNULUS 分支部件 BRANCH 圆管部件 PIPE 泵部件 PUMP 单一控制体 SNGLVOL 单一连接件 SNGLJUN 时间相关控制体 TMDPVOL 时间相关连接件 TMDPJUN 阀门 VALVE
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表 4 SGTR初始条件
Table 4. Initial Conditions for SGTR
参数名 参数值 反应堆热功率/MW 1192 一回路运行压力/MPa 15.51 单环路冷却剂流量/(kg·s−1) 3628 压力容器进口温度/℃ 287.3 压力容器出口温度/℃ 317.1 (堆芯冷却剂旁流流量/堆芯总流量)/% 4.5 压力容器进出口压差/MPa 0.216 稳压器压力/MPa 15.5 (稳压器液位/稳压器满液位)/% 25.01 稳压器内蒸汽温度/K 617.9 一回路热管段压力/MPa 15.5 一回路热管段温度/K 528 二回路运行压力/MPa 5.88 SG给水流量/(kg·s−1) 333 SG给水温度/℃ 230 SG蒸汽流量/(kg·s−1) 333 SG下降段水位/m 11.662 再循环倍率 6.0 破口流量/(kg·s−1) 15
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表 5 SGTR事故时序
Table 5. Chronology of SGTR
时刻/s 事件 0 SGTR事故发生 210.7 稳压器电加热器关闭 900.0 SG-A大气阀打开 1111.7 破口环路主泵停转 1200.0 高压安注系统启动 1428.3 SG-A电动辅助给水泵打开 1479.1 SG-B电动辅助给水泵打开 1992.0 SG-B电动辅助给水泵关闭 2105.7 破口环路主泵重启 2106.0 稳压器喷淋阀打开 2248.0 稳压器电加热器打开 2287.0 稳压器喷淋阀关闭 2700.0 事故结束
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