EAPSI: Monitoring pipe weldments for crack formation and failure in real time in nuclear power plants

EAPSI：实时监测核电站管道焊件的裂纹形成和失效情况

• 批准号: 1414960
• 负责人: Joshua Marks
• 金额: $ 0.51万
• 依托单位: Marks Joshua A
• 依托单位国家: 美国
• 项目类别: Fellowship Award
• 财政年份: 2014
• 资助国家: 美国
• 起止时间: 2014-06-01 至 2015-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1414960&HistoricalAwards=false
• 关键词: EAPSI; Monitoring; pipe; weldments; crack

As a country, South Korea has a high percentage of its electricity generated by nuclear power. As these nuclear power plants approach the point in their life-cycle where corrosion starts causing weldment and pipe failures, it is important to develop a detection method that works in real time and while the plant is on-line. Unexpected weldment and pipe failures that were not predicted by conventional detection methods have caused work site accidents and deaths. Improving plant safety from early on can help mitigate major system failures, and decrease the plant operation costs. This project aims to develop and implement a direct current potential drop system that is usable in the harsh operating conditions of a nuclear power plant. This research will be conducted at Seoul National University under the sponsorship of Dr. Il Soon Hwang, the leading expert in the direct current potential drop measurement technique utilized in this research.Flow accelerated corrosion (FAC) has been identified as the largest cause of secondary pipe integrity failures. Creating accurate models of pipe wall thinning and failures due to FAC is therefore an important research effort. To date, however, these models have proved to be inaccurate and pipe failures continue. The failure of the FAC models has been determined to be caused by rapid changes in the variables: pH, dissolved oxygen, or temperature, that affect the rate of FAC. In order to create accurate models the data must be sampled at a higher rate to ensure accurate representation of changing variables and pipe conditions. This project will develop, test, and characterize a laboratory system that utilizes the direct current potential drop technique to measure the change in electrical resistance for segments of piping and key weldments. The laboratory system will then be implemented in a functioning nuclear power plant. This NSF EAPSI award is funded in collaboration with the National Research Foundation of Korea.

作为一个国家，韩国拥有核电产生的电力的很高比例。当这些核电站接近腐蚀开始引起焊接和管道故障的生命周期中的点时，重要的是开发一种实时和工厂在线时起作用的检测方法。常规检测方法未预测的意外焊接和管道故障导致工作现场事故和死亡。从早期开始提高植物安全可以帮助减轻重大系统故障，并降低植物运营成本。该项目旨在开发和实施在核电站严酷的运营条件下可用的直接电流潜在掉落系统。这项研究将在本研究的直接当前潜在潜在掉落测量技术的领先专家Il Soon Hwang博士的赞助下在首尔国立大学进行。流动加速腐蚀（FAC）已被确定为次要管道完整性失败的最大原因。因此，创建准确的管子壁变薄模型和由于FAC引起的故障是一项重要的研究工作。但是，迄今为止，这些模型已被证明是不准确的，并且管道故障仍在继续。 FAC模型的失败已确定是由变量的快速变化引起的：影响FAC速率的pH，溶解氧或温度。为了创建准确的模型，必须以更高的速率对数据进行采样，以确保变化变量和管道条件的准确表示。该项目将开发，测试和表征实验室系统，该实验室系统利用直接电流电位下降技术来衡量管道和键焊段的电阻变化。然后，实验室系统将在运行中的核电站中实施。该NSF EAPSI奖与韩国国家研究基金会合作。