The pH and Iodine Diffusion Model for IRWST after LOCA Accident of HPR1000
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摘要: “华龙一号”地坑设置非能动pH值调节篮，加入碱性添加剂控制大破口失水事故（LOCA）后安全壳内置换料水箱（IRWST）pH，从而降低壳内气相碘浓度，预测事故后pH和碘浓度对事故源项和放射性分析至关重要。本文针对LOCA后再循环水流程，结合碘的气液分配、双膜理论以及碘形态与pH关系，建立宏观瞬态模型，实现事故后IRWST瞬态pH、物质浓度以及安全壳内气液两相碘浓度计算。对比Visual MINTEQ软件结果验证了模型pH计算，选取工况参数代入模型分析影响因素，结果正确反映pH与碘浓度的关系，证明该模型具备预测事故后pH和碘浓度的能力。
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关键词:
- 大破口失水事故(LOCA) /
- 安全壳 /
- 碘 /
- pH /
- “华龙一号”
Abstract: A passive pH adjustment basket is set in the HPR1000 pit to control the pH of the in-containment refueling water storage tank (IRWST) after the loss of coolant accident (LOCA) by adding alkaline additives, so as to reduce the concentration of gaseous iodine in the containment. Predicting the pH and iodine concentration after an accident is critical for accident source term and radioactive analysis. In this paper, aiming at the recirculation water flow after LOCA, combined with the gas-liquid distribution of iodine and the two-film theory and the relationship between iodine form and pH, a macro transient model is established to realize the calculation of IRWST transient pH, substance concentration and gas-liquid two-phase iodine concentration in containment after the accident. By comparing with the results of Visual MINTEQ software, the pH calculation part of the model is verified. The condition parameters are substituted into the model to analyze the influencing factors. The results can correctly show the relationship between pH and iodine concentration, which proves that the model has the ability to predict pH and iodine concentration after accident.-
Key words:
- Loss of coolant accident (LOCA) /
- Containment /
- Iodine /
- pH /
- HPR1000
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图 3 CPHII和Visual MINTEQ的pH计算结果
Figure 3. pH Calculation Results of CPHII and Visual MINTEQ
图 4 各因素对事故后pH的影响
破口流量1<破口流量2
Figure 4. Influence of Various Factors on Post-accident pH
图 5 工况2参数下CPHII的计算结果
Figure 5. Calculation Results of CPHII under Condition 2 Parameters
表 1 酸碱源项
Table 1. Acid-base Source Terms
物质 来源 H3BO3 安注箱、RBS、冷却剂本身、IRWST HI 堆芯释放的碘溶于水 HNO3 空气和水受辐照产生 HCl 电缆绝缘层等有机物受辐照产生氯气，氯气和水反应产生 H2CO3 水吸收二氧化碳产生 TSP pH调节篮 NaOH 一回路中pH调节、喷淋 CsOH 堆芯释放的铯溶于水 LiOH 一回路冷却剂 
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表 2 不同工况下混合物质体系浓度
Table 2. Concentration of Mixed Material Systems under Different Conditions
工况序号 物质浓度/（mol·L−1） H3BO3 HNO3 HCl TSP NaOH CsOH LiOH HI C1 0.4 10−4 10−5 10−4 10−4 10−4 10−4 10−3 C2 0.4 10−5 10−3 10−4 10−4 10−4 10−4 10−4 C3 0.2 10−5 10−5 10−4 10−4 10−4 10−4 0 C4 0.4 10−5 10−5 10−2 10−4 10−4 10−4 0 C5 0.4 10−5 10−5 10−4 10−4 10−4 10−5 0 C6 0.5 10−4 10−4 10−4 10−4 10−4 0 0 C7 0.4 10−5 10−5 10−3 10−3 10−4 0 10−4 C8 0.4 10−5 10−5 10−3 10−4 10−3 0 10−4
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