SCC properties of modified alloy 718 in BWR plant

Yoshinori Katayama, Motoji Tsubota, Yoshiaki Saito, Norihiko Tanaka, Shigeaki Tanaka

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Citation (Scopus)

Abstract

A modified alloy 718 has been developed as an alternative material to nickel-based alloy X-750 used in the boiling water reactors (BWR). Stress corrosion cracking (SCC) of a jet pump beam made of alloy X-750, occurred in a BWR plant. In order to apply modified alloy 718 to the jet pump beam, an evaluation of resistance to SCC initiation based on a uni-axial constant load (UCL) test in high temperature water was carried out. All UCL test specimens of modified alloy 718 at an applied stress beyond the yield strength in 288°C showed no failure after 10,124 hours testing. On the other hand, UCL specimens of alloy X-750 at an applied stress of 900MPa failed within 10,000 hours. Therefore, it was confirmed that modified alloy 718 had longer SCC initiation time in high temperature water than alloy X-750. Moreover, fatigue and spring properties of modified alloy 718 were also evaluated, and the characteristics of both modified alloy 718 and alloy X-750 were compared.

Original languageEnglish
Title of host publication15th International Conference on Environmental Degradation of Materials in Nuclear Power Systems-Water Reactors 2011
PublisherJohn Wiley and Sons Inc.
Pages723-736
Number of pages14
ISBN (Print)9781622761944
Publication statusPublished - 2011
Externally publishedYes
Event15th International Conference on Environmental Degradation of Materials in Nuclear Power Systems-Water Reactors 2011 - Colorado Springs, CO, United States
Duration: 2011 Aug 72011 Aug 11

Publication series

Name15th International Conference on Environmental Degradation of Materials in Nuclear Power Systems-Water Reactors 2011
Volume1

Other

Other15th International Conference on Environmental Degradation of Materials in Nuclear Power Systems-Water Reactors 2011
Country/TerritoryUnited States
CityColorado Springs, CO
Period11/8/711/8/11

Keywords

  • Alloy 718
  • Alloy X-750
  • Fatigue test
  • Jet pump beam
  • Spring properties
  • Stress corrosion cracking
  • Uni-axial constant load test

ASJC Scopus subject areas

  • Nuclear Energy and Engineering
  • Pollution

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