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Hydrogen ingress through the rolled joints of CANDU pressure tubes

氢气通过 CANDU 压力管的轧制接头进入

基本信息

批准号：
468842-2014
负责人：
McRae, Glenn
金额：
$ 1.75万
依托单位：
Carleton University
依托单位国家：
加拿大
项目类别：
Engage Grants Program
财政年份：
2014
资助国家：
加拿大
起止时间：
2014-01-01 至 2015-12-31
项目状态：
已结题

来源：
https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=563058
关键词：
Hydrogen ingress through rolled joints

项目摘要

Laker Energy Products Ltd and Carleton University are collaborating to develop experiments and models that simulate hydrogen movement through the rolled joints used to couple end fittings to pressure tubes in CANDU fuel channels. Hydrogen in pressure tubes can lead to a time-dependent mechanism of fracture called delayed hydride cracking (DHC) that has been responsible for several failures of zirconium components in nuclear reactors and chemical plants. In CANDU reactors, hydrogen levels are kept low by design, however, during operation hydrogen ingress happens across the rolled joints at the end of each pressure tube. Surveillance campaigns and predictive models with large safety margins are used to guarantee hydrogen levels in the pressure tubes stay well below the levels where DHC can occur. Margins are currently employed that reflect our level of understanding of the mechanism of ingress across the rolled joints. Arguably these margins could be safely reduced with better understanding, and save millions of dollars of avoided costs by prematurely replacing good pressure tubes. Laker Energy Products Ltd is one of only two suppliers of end fittings for rolled joints in CANDU reactors. They wish to collaborate with Carleton University to understand the rolled-joint ingress mechanism and ultimately to develop a better end-fitting design.

lake Energy Products Ltd和卡尔顿大学正在合作开发实验和模型，以模拟氢气通过CANDU燃料通道中连接端件和压力管的轧制接头的运动。压力管中的氢气会导致一种时间依赖性断裂机制，称为延迟氢化物开裂（DHC），这种断裂机制已经导致核反应堆和化工厂中锆组件的多次失效。在CANDU反应堆中，氢水平被设计得很低，然而，在运行过程中，氢进入发生在每个压力管末端的轧制接头上。监测活动和具有较大安全边际的预测模型用于保证压力管中的氢含量远低于可能发生DHC的水平。目前所采用的余量反映了我们对轧制接头进入机制的理解水平。可以说，通过更好地了解，这些差额可以安全地减少，并通过过早更换良好的压力管节省数百万美元的避免成本。莱克能源产品有限公司是CANDU反应堆轧制接头端部配件的两家供应商之一。他们希望与卡尔顿大学合作，了解滚动关节的进入机制，并最终开发出更好的末端配合设计。