Finite element analysis of hydrogen concentration for blister growth estimation of CANDU pressure tube

Nam Su Huh, Yun Jae Kim, Young Jin Kim, Young Seok Kim, Yong Moo Cheong

Research output: Contribution to journalArticle


The pressure tubes, which contain high temperature heavy water and fuel, are within the core of a CANDU nuclear reactor, and are thus subjected to high stresses, temperature gradient, and neutron flux. Further, it is well known that pressure tubes of cold-worked Zr-2.5Nb materials result in hydrogen diffusion, which create fully-hydrided regions (frequently called Blister). Thus a proper investigation of hydrogen diffusion within zirconium-alloy nuclear components, such as CANDU pressure tube and fuel channels is essential to predict the structural integrity of these components. In this respect, this paper presents numerical investigation of hydrogen diffusion to quantify the hydrogen concentration for blister growth of CANDU pressure tube. For this purpose, coupled temperature-hydrogen diffusion analyses are performed by means of 2-dimensional finite element analysis. Comparison of predicted temperature field and blister with published experimental data shows good agreement.

Original languageEnglish
Pages (from-to)734-740
Number of pages7
JournalKey Engineering Materials
Volume297-300 II
Publication statusPublished - 2005 Dec 1
Externally publishedYes



  • Blister
  • CANDU pressure tube
  • Hydrogen diffusion
  • Temperature gradient
  • Zr-2.5Nb alloy

ASJC Scopus subject areas

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering

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