0
research-article

NUMERICAL VALIDATIONS OF FLAW SHAPE IDEALIZATION METHODS TO BURST PRESSURE ESTIMATIONS OF STEAM GENERATOR TUBE WITH AXIAL SURFACE FLAWS

[+] Author and Article Information
Seunghyun Park

School of Mechanical Engineering, Sungkyunkwan University, 2066 Seobu0-ro, Jangan-gu, Suwon, Gyeonggi-do 16419, Republic of Korea
locamve@skku.edu

Jae-Boong Choi

School of Mechanical Engineering, Sungkyunkwan University, 2066 Seobu0-ro, Jangan-gu, Suwon, Gyeonggi-do 16419, Republic of Korea
boong33@skku.edu

Nam-Su Huh

Dept. of Mechanical System Design Engineering, Seoul National University of Science and Technology, 232 Gongneung-ro, Nowon-gu, Seoul 01811, Republic of Korea
nam-su.huh@seoultech.ac.kr

Sang-Min Lee

Korea Institute of Nuclear Safety, 62 Gwahak-ro, Yuseong-gu, Daejeon 34142, Republic of Korea
sangmin.lee@kins.re.kr

Yong-Beum Kim

Korea Institute of Nuclear Safety, 62 Gwahak-ro, Yuseong-gu, Daejeon 34142, Republic of Korea
ybkim@kins.re.kr

1Corresponding author.

ASME doi:10.1115/1.4038310 History: Received July 10, 2017; Revised October 21, 2017

Abstract

The present work investigates the applicability of the flaw shape idealization methods to carry out the structural integrity assessment of steam generator (SG) tubes under internal pressure with complicated axial inner and outer surface flaws that were typically found during the in-service-inspection (ISI). In terms of flaw shape, three different shapes of flaws which can be detected during an actual ISI are considered, i.e., long symmetric flaw, asymmetric inclined flaw and narrow, symmetric deep flaw. As for flaw shape idealization methods for the predictions of burst pressures of these flaws, four different flaw shape idealization models, i.e., semi-elliptical, rectangular, maximum length with effective flaw depth and weakest sub-crack model proposed by the EPRI, are employed in the present work. In order to validate the applicability of these idealization methods, the burst pressures of SG tubes with these flaws are investigated by using the finite element (FE) analyses. By comparing the predictions of the burst pressures based on the four different flaw shape idealization methods with those based on actual flaw shapes, it is found that the weakest sub-crack model proposed by the EPRI and maximum length with effective flaw depth model provide the better agreement with actual complex flaw.

Copyright (c) 2017 by ASME
Your Session has timed out. Please sign back in to continue.

References

Figures

Tables

Errata

Discussions

Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging and repositioning the boxes below.

Related Journal Articles
Related eBook Content
Topic Collections

Sorry! You do not have access to this content. For assistance or to subscribe, please contact us:

  • TELEPHONE: 1-800-843-2763 (Toll-free in the USA)
  • EMAIL: asmedigitalcollection@asme.org
Sign In