Evaluation of Through Wall Fracture Toughness Distribution of IAEA Reference Material JRQ by Mini-C(T) Specimens and the Master Curve Method

Masato Yamamoto, Tomohiro Kobayashi
{"title":"Evaluation of Through Wall Fracture Toughness Distribution of IAEA Reference Material JRQ by Mini-C(T) Specimens and the Master Curve Method","authors":"Masato Yamamoto, Tomohiro Kobayashi","doi":"10.1115/PVP2018-84889","DOIUrl":null,"url":null,"abstract":"The load and temperature history during pressurized thermal shock (PTS) event is highly depending on the crack edge location in wall thickness direction of a reactor pressure vessel (RPV) beltline region. Therefore, the consideration of plant specific through-wall fracture toughness distribution, which is not considered in the current codes and regulations [1,2], may improve the structural integrity assessment for PTS event.\n The Master Curve (MC) method [3,4] is one of the methods, which can directory evaluate the fracture toughness of ferritic materials with relatively low number of any size of specimens. CRIEPI has proposed the use of very small C(T) (Mini-C(T)) specimens for the MC method. The appropriateness of Mini-C(T) technology has been demonstrated through a series of researches and round robin activities [5, 6, 7, 8, 9].\n The present study evaluated the through-wall fracture toughness distribution of irradiated IAEA reference material (JRQ) by means of combination of MC method and Mini-C(T) specimens. Four thickness locations between inner surface to 1/4-T was selected. Those four layers were separately subjected to the Mini-C(T) MC evaluation in two different laboratories. Both laboratories could separately obtain valid and consistent reference temperature, To, from all the tested layers. Inner most layer exhibits 80 °C lower To compared to the 1/4-T location even though the layer has the highest fluence of 5.38 × 1019 n/cm2, while that in 1/4-T location is 2.54 × 1019 n/cm2. The results demonstrate that initial toughness distribution is dominant in the general trend of fracture toughness distribution even after the material was highly irradiated.","PeriodicalId":128383,"journal":{"name":"Volume 1A: Codes and Standards","volume":"77 1","pages":"0"},"PeriodicalIF":0.0000,"publicationDate":"2018-07-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"1","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Volume 1A: Codes and Standards","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.1115/PVP2018-84889","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 1

Abstract

The load and temperature history during pressurized thermal shock (PTS) event is highly depending on the crack edge location in wall thickness direction of a reactor pressure vessel (RPV) beltline region. Therefore, the consideration of plant specific through-wall fracture toughness distribution, which is not considered in the current codes and regulations [1,2], may improve the structural integrity assessment for PTS event. The Master Curve (MC) method [3,4] is one of the methods, which can directory evaluate the fracture toughness of ferritic materials with relatively low number of any size of specimens. CRIEPI has proposed the use of very small C(T) (Mini-C(T)) specimens for the MC method. The appropriateness of Mini-C(T) technology has been demonstrated through a series of researches and round robin activities [5, 6, 7, 8, 9]. The present study evaluated the through-wall fracture toughness distribution of irradiated IAEA reference material (JRQ) by means of combination of MC method and Mini-C(T) specimens. Four thickness locations between inner surface to 1/4-T was selected. Those four layers were separately subjected to the Mini-C(T) MC evaluation in two different laboratories. Both laboratories could separately obtain valid and consistent reference temperature, To, from all the tested layers. Inner most layer exhibits 80 °C lower To compared to the 1/4-T location even though the layer has the highest fluence of 5.38 × 1019 n/cm2, while that in 1/4-T location is 2.54 × 1019 n/cm2. The results demonstrate that initial toughness distribution is dominant in the general trend of fracture toughness distribution even after the material was highly irradiated.
查看原文
分享 分享
微信好友 朋友圈 QQ好友 复制链接
本刊更多论文
用Mini-C(T)试样和主曲线法评价IAEA基准材料JRQ的穿壁断裂韧性分布
压力热冲击(PTS)过程中的载荷和温度历史高度依赖于反应堆压力容器(RPV)腰线区域壁厚方向上裂纹边缘的位置。因此,考虑现有规范和规程[1,2]中未考虑的工厂特有的穿壁断裂韧性分布,可能会改善PTS事件的结构完整性评估。主曲线法(Master Curve, MC)[3,4]是其中一种方法,可以在数量相对较少的情况下,对任意尺寸的铁素体材料的断裂韧性进行指导性评价。CRIEPI建议使用非常小的C(T) (Mini-C(T))标本进行MC方法。Mini-C(T)技术的适宜性已经通过一系列的研究和循环活动得到了证明[5,6,7,8,9]。采用MC法和Mini-C(T)试样相结合的方法,对辐照后的IAEA基准材料(JRQ)的穿壁断裂韧性分布进行了评价。选取了内表面到1/4-T之间的四个厚度位置。这四层分别在两个不同的实验室进行Mini-C(T) MC评价。两个实验室可以分别从所有被测层中获得有效且一致的参考温度To。与1/4-T位置相比,最内层的影响度降低了80°C,尽管该层的影响度最高,为5.38 × 1019 n/cm2,而1/4-T位置的影响度为2.54 × 1019 n/cm2。结果表明,即使在高辐照条件下,初始韧性分布在断裂韧性分布的总体趋势中仍占主导地位。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
求助全文
约1分钟内获得全文 去求助
来源期刊
自引率
0.00%
发文量
0
期刊最新文献
Improvement of Target Flaw Sizes of CASS Pipe for PD Approval Using PFM Code Preface Effect of Pre-Heat Treatment on Hydrogen Concentration Behavior of y-Grooved Weld Joint Based on a Coupled Analysis of Heat Transfer-Thermal Stress-Hydrogen Diffusion Hydrogen Diffusion Concentration Behaviors for Square Groove Weld Joint Cyclic, Monotonic and Fatigue Performance of Stabilized Stainless Steel in PWR Water and Research Laboratory Interlaboratory Study for Small Punch Testing Preliminary Results
×
引用
GB/T 7714-2015
复制
MLA
复制
APA
复制
导出至
BibTeX EndNote RefMan NoteFirst NoteExpress
×
×
提示
您的信息不完整,为了账户安全,请先补充。
现在去补充
×
提示
您因"违规操作"
具体请查看互助需知
我知道了
×
提示
现在去查看 取消
×
提示
确定
0
微信
客服QQ
Book学术公众号 扫码关注我们
反馈
×
意见反馈
请填写您的意见或建议
请填写您的手机或邮箱
已复制链接
已复制链接
快去分享给好友吧!
我知道了
×
扫码分享
扫码分享
Book学术官方微信
Book学术文献互助
Book学术文献互助群
群 号:481959085
Book学术
文献互助 智能选刊 最新文献 互助须知 联系我们:info@booksci.cn
Book学术提供免费学术资源搜索服务,方便国内外学者检索中英文文献。致力于提供最便捷和优质的服务体验。
Copyright © 2023 Book学术 All rights reserved.
ghs 京公网安备 11010802042870号 京ICP备2023020795号-1