Improvement and Analysis of Design of Secondary-side Passive Residual Heat Removal System for PWR
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摘要: 针对三代核电厂中的二次侧非能动余热排出系统（PRS）应用于改进型压水反应堆存在限制条件，构成PRS系统的重要构筑物最终冷却水箱距离安全壳较远，使得系统蒸汽和凝水管道较长且布置复杂的情况。本文对PRS系统进行了优化设计，采用ARSAC软件分析模拟计算了初始蒸汽管道隔离阀常关，管道中分别充满了氮气、蒸汽以及水的工况下系统投运后的瞬态过程，并与初始常开工况下投运瞬态结果进行了对比。分析结果表明，各方案均能实现系统功能，在工程可实现性和系统运行稳定性上各有优缺点，结合工程实际，管道中充满氮气的方案有较高的应用价值。
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关键词:
- ARSAC软件 /
- 二次侧非能动余热排出系统（PRS） /
- 全厂断电
Abstract: In applying the design of secondary-side passive residual heat removal system (PRS) of Generation 3 PWR to Generation 2+PWR, there are limitations due to the long distance between the cooling water tank of the PRS with the shell of the PWR, which complicates the arrangement of the relatively long steam pipe and condensation pipe of the PRS. This paper presents an improved design for PRS. The ARSAC code was used to simulate and calculate the transient process of the system under different operating conditions, namely, the initial isolation valve of the steam pipeline was closed and the pipeline was filled with nitrogen, steam, and water, respectively. The results were compared with those obtained under the initial condition of an open valve. The comparison results show that all designs can meet the requirement of residual heat removal, but have advantages and disadvantages in engineering feasibility and system operational stability. Therefore, the improvement design with the steam pipe are full of nitrogen is most recommended to apply in engineering. -
图 2 优化方案示意图
1— PRS蒸汽管道；2—蒸汽管道隔离阀；3—氮气排放阀；4—水封；5—系统换热器；6—凝水管道隔离阀；7—PRS凝水管道；8—最终热阱水箱；9—连接低温蒸汽充注系统的管道和阀门
Figure 2. Schematic Diagram of the Improved Scheme
图 6 PRS系统换热功率与额定功率之比
Figure 6. Proportion of Heat Exchanger Power of PRS to Rated Power
表 1 方案评价
Table 1. Scheme Evaluation
方案 改造代价 运行效果 其他影响 方案1 需增加氮气排放阀 可较快建立自然循环 少量蒸汽混合氮气排出 方案2 需增加低温蒸汽充注系统 最快建立稳定自然循环 系统未投运时需要日常维护，始终保持管道中充满蒸汽 方案3 无需改造 需较长时间建立自然循环，会造成稳压
器释放阀开启系统投运初期高压蒸汽与低温水混合会带来压力振荡，
液滴可能会对管道造成冲击
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