Research on Environmentally Assisted Fatigue Analysis Method for Primary Circuit of Pressurized Water Reactor Units
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摘要: 环境促进疲劳(EAF)是以水为冷却剂的反应堆的重要老化机理,对核电厂一回路关键敏感部位的疲劳寿命有重要影响。介绍了美国关于EAF关键敏感部位的筛选流程和环境疲劳修正因子(Fen)的计算公式,并统计了美国延寿机组EAF关键敏感部位筛选的结果。参考美国EAF分析方法,筛选出了国内某核电厂1、2号机组一回路EAF关键敏感部位。所述流程、方法和案例对于国内核电厂EAF分析具有重要的指导和示范意义。
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关键词:
- 核电 /
- 环境促进疲劳(EAF) /
- 筛选 /
- 老化
Abstract: Environmentally assisted fatigue (EAF) is an important aging mechanism for reactors with water as coolant, which has significant influences on the fatigue life of critical sensitive components in primary circuit of nuclear power plants. In this paper, the EAF screening process of critical sensitive components and the calculation formula of environmental fatigue correction factor (Fen) deriving from the United States are introduced. Meanwhile, the results of EAF key sensitive part screening for the license renewal units in the United States are statistically analyzed. Referring to the EAF analysis method of the United States, the critical sensitive components of the primary circuit of Units 1 and 2 in a domestic plant are selected. The processes, methods, and cases have important guiding and demonstration significance for EAF analysis in the domestic nuclear power plants.-
Key words:
- Nuclear power /
- Environmentally assisted fatigue (EAF) /
- Screening /
- Aging
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表 1 美国压水堆机组(申请延寿)重点关注部位
Table 1. EAF Focused Components of PWR Units (Applied for License Renewal) in U.S.
序号 重点关注部位 涉及机组数量/台 1 稳压器波动管热段接管 50 2 反应堆压力容器进、出口接管 48 3 上充管线与主管道接管 46 4 反应堆压力容器壳体和下封头过渡段 44 5 稳压器与波动管接管 36 6 安注管线与主管道接管 35 7 余热排出系统核1级管道 30 8 安注箱与一回路接管 10 9 停堆冷却系统核1级管道 10 10 稳压器喷淋接管 8 11 稳压器安全阀和泄压阀接管 8 12 稳压器电加热器套管 6 13 化学与容积控制系统下泄管道 6 14 蒸汽发生器人孔和水室出口 4 表 2 主设备关键部位Uen排序
Table 2. Uen Ranking of Critical Components of Major Equipment
序号 部位 Uen(40 a) 1 稳压器 电加热元件套管 1.00 2 仪表接管 0.80 3 波动管接管嘴 0.40 4 上封头与筒体连接部位 0.09 5 喷雾接管嘴 0.08 1 蒸汽发生器 一次侧腔体、管板及连接筒体 1.00 2 U型传热管 0.56 3 传热管与管板的焊接部位 0.34 4 下封头隔板 0.15 1 反应堆
压力容器最外围中子测量管 1.00 2 安注箱接管 0.89 3 中子测量管管座(2号机组) 0.69 4 最外围控制棒驱动机构管座 0.44 5 进口接管 0.20 6 出口接管 0.11 表 3 主管道关键管件和部位Uen排序
Table 3. Uen Ranking of Critical Components of Major Pipelines
序号 管件或部位 Uen(40 a) 1 蒸汽发生器入口弯头 1.00 2 温度计套管管嘴(热段) 0.59 3 稳压器波动管管嘴 0.43 4 取样管管嘴 0.43 5 蒸汽发生器出口弯头 0.42 6 测温旁路接管管嘴(冷段) 0.39 7 温度计套管管嘴(冷段) 0.38 8 上充管管嘴 0.30 9 流量测量管管嘴 0.30 10 测温旁路接管管嘴(过渡段) 0.26 11 测温旁路接管管嘴(热段) 0.25 12 反应堆压力容器出口焊缝 0.22 13 蒸汽发生器入口焊缝 0.22 14 主泵出口焊缝 0.13 15 反应堆压力容器入口焊缝 0.13 16 蒸汽发生器出口焊缝 0.13 17 主泵入口焊缝 0.13 18 稳压器喷雾管管嘴 0.08 19 疏排水管管嘴 0.02 20 下泄管管嘴 0.01 -
[1] 韩恩厚. 核电高温高压水中材料腐蚀关键测试技术[J]. 中国材料进展,2020, 39(7-8): 519-526. doi: 10.7502/j.issn.1674-3962.202006029 [2] 张兹瑜,吴欣强,韩恩厚,等. 核电结构材料腐蚀疲劳裂纹扩展行为研究现状与进展[J]. 中国腐蚀与防护学报,2022, 42(1): 9-15. [3] 贺寅彪,曹明,姚伟达. 关于LWR设备设计中考虑环境对疲劳影响问题的探讨[J]. 核动力工程,2011, 32(S1): 35-39,97. [4] WARE A G, MORTON D K, NITZEL M E. Application of NUREG/CR-5999 interim fatigue curves to selected nuclear power plant components: NUREG/CR-6260[R]. Washington: NRC, 1995. [5] U. S. Nuclear Regulatory Commission. Generic aging lessons learned (GALL) report: NUREG-1801[R]. Washington: NRC, 2010. [6] U. S. Nuclear Regulatory Commission. Generic aging lessons learned for subsequent license renewal (GALL-SLR) report: NUREG-2191[R]. Washington: NRC, 2017. [7] U. S. Nuclear Regulatory Commission. Effect of LWR water environments on the fatigue life of reactor materials: NUREG/CR-6909 Rev. 1[R]. Washington: NRC, 2018. [8] Electric Power Research Institute. Environmentally assisted fatigue screening methods: EPRI 3002018262[R]. USA,Washington: EPRI, 2020. [9] U. S. Nuclear Regulatory Commission. Effects of LWR coolant environments on fatigue design curves of carbon and low-alloy steels: NUREG/CR-6583[R]. Washington: NRC, 1998. [10] U. S. Nuclear Regulatory Commission. Effects of LWR coolant environments on fatigue design curves of austenitic stainless steels: NUREG/CR-5704[R]. Washington: NRC, 1999.