Estimation of residual stress distribution for pressurizer nozzle of Kori nuclear power plant considering safe end

Tae Kwang Song, Hong Yeol Bae, Yun Bae Chun, Chang Young Oh, Yun Jae Kim, Kyoung Soo Lee, Chi Yong Park

Research output: Contribution to journalArticle

13 Citations (Scopus)

Abstract

In nuclear power plants, ferritic low alloy steel nozzle was connected with austenitic stainless steel piping system through alloy 82/182 butt weld. Accurate estimation of residual stress for weldment is important in the sense that alloy 82/182 is susceptible to stress corrosion cracking. There are many results which predict residual stress distribution for alloy 82/182 weld between nozzle and pipe. However, nozzle and piping system usually connected through safe end which has short length. In this paper, residual stress distribution for pressurizer nozzle of Kori nuclear power plant was predicted using FE analysis, which consideded safe end. As a result, existing residual stress profile was redistributed and residual stress of inner surface was decreased specially. It means that safe end should be considered to reduce conservatism when estimating the piping system.

Original languageEnglish
Pages (from-to)668-677
Number of pages10
JournalTransactions of the Korean Society of Mechanical Engineers, A
Volume32
Issue number8
DOIs
Publication statusPublished - 2008 Aug 1

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Keywords

  • Dissimilar metal weld
  • PWSCC
  • Residual stress
  • Safe end

ASJC Scopus subject areas

  • Mechanical Engineering

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