Influence on structure and fracture mechanics evaluations of a BWR feedwater nozzle following weld overlay repair

IF 1.5 4区 工程技术 Q3 MECHANICS
Ru-Feng Liu, Ming-Chung Young
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引用次数: 0

Abstract

This present paper summarizes applying weld overlay repair on the feedwater nozzle in a boiling water reactor, and evaluates the influence on the structure and fracture mechanics of the component. The requirements for utilizing a full structural weld overlay, including the weld overlay design, effects of welding residual stresses (WRSs), impacts of weld shrinkage, prediction of potential flaw growth, and influence on ASME Code Section III design evaluations, are further defined in ASME Code Case N-504–2. In order to confirm the effectiveness of the weld overlay design of the nozzle, the WRSs following overlay installation were determined using engineering simulation software. The impacts of weld shrinkage from overlay welding are also addressed. The shrinkage stresses were evaluated via a numerical model of the attached piping system to ensure the design margins of the pipe structure. Since the weld overlay technique is well known to be effective in mitigating crack initiation or cracking to leakage, a fatigue crack growth prediction under ASME Code Section XI must be conducted to address the fatigue qualification of the affected component. The ASME Code Section III construction qualification of the whole nozzle region must consider the applicable thermal transient stresses, structural discontinuities, and bimetallic effects that are caused by the weld overlay. This investigation proves that the current stress analyses of the nozzle and the pipe structure are not significantly affected by the added overlay mass, so the structural integrity of the component can be ensured, meeting the requirements of ASME Code Case N-504–2.
堆焊修复对沸水堆给水喷嘴结构及断裂力学评价的影响
本文综述了在沸水反应堆给水喷嘴上应用焊缝堆焊修复的情况,并对其对构件结构和断裂力学的影响进行了评价。使用完整的结构焊缝覆盖层的要求,包括焊缝覆盖层设计、焊接残余应力(wrs)的影响、焊缝收缩的影响、潜在缺陷生长的预测以及对ASME规范第III节设计评估的影响,在ASME规范案例N-504-2中有进一步的定义。为了验证喷管焊缝叠加设计的有效性,利用工程仿真软件确定了叠加后的wrs。还讨论了堆焊时焊缝收缩的影响。在保证管道结构设计裕度的前提下,通过附加管道系统的数值模型对收缩应力进行了评估。ASME规范第三部分对整个喷嘴区域的施工资格必须考虑适用的热瞬态应力、结构不连续和由焊缝覆盖引起的双金属效应。本次调查证明,增加的覆盖质量对喷管结构和管道结构的当前应力分析影响不大,可以保证构件的结构完整性,满足ASME规范案例N-504-2的要求。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Journal of Mechanics
Journal of Mechanics 物理-力学
CiteScore
3.20
自引率
11.80%
发文量
20
审稿时长
6 months
期刊介绍: The objective of the Journal of Mechanics is to provide an international forum to foster exchange of ideas among mechanics communities in different parts of world. The Journal of Mechanics publishes original research in all fields of theoretical and applied mechanics. The Journal especially welcomes papers that are related to recent technological advances. The contributions, which may be analytical, experimental or numerical, should be of significance to the progress of mechanics. Papers which are merely illustrations of established principles and procedures will generally not be accepted. Reports that are of technical interest are published as short articles. Review articles are published only by invitation.
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