Study of mechanism for corrosion and hydrogen absorption of high burnup fuel cladding

Y. Saiki, K. Kakiuchi, H. Kishita, H. Muta, S. Yamanaka, M. Hatakeyama, K. Konashi, T. Shikama, M. Uno, T. Terai, K. Oyama

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

Abstract

Post irradiation examinations (PIEs) of Zry-2 cladding and spacer specimens irradiated for 5 cycles in a Japanese commercial boiling-water reactor (BWR) were performed, and were investigated regarding the mechanism for the local increment of corrosion and hydrogen absorption. We conducted transmission electron microscopy (TEM) observations and electrochemical (EC) measurements of these samples. Based on the results of TEM observations of the microstructure in the 5-cycle irradiated cladding specimens with lower Fe and Si content, the following distinguishing properties were observed relative to cladding specimens with more usual corrosion properties: 1) existence of high density microcracks and pores near the oxide/matrix (O/M) interface, 2) disappearance of tetragonal phase zirconium oxide (t-ZrO2) on the matrix with an accumulation of zirconium hydride (ZrH1.6), 3) a decreasing trend of the number density of second phase particles (SPPs). Furthermore, based on the EC measurements, it was observed that the flat-band potential decreases with increases in the fast neutron fluence. In this paper, we will explain the mechanism of corrosion in high burnup region based on these examination results.

Original languageEnglish
Title of host publicationLWR Fuel Performance Meeting, Top Fuel 2013
PublisherAmerican Nuclear Society
Pages110-114
Number of pages5
ISBN (Print)9781629937212
Publication statusPublished - 2013
EventLWR Fuel Performance Meeting, Top Fuel 2013 - Charlotte, NC, United States
Duration: 2013 Sep 152013 Sep 19

Publication series

NameLWR Fuel Performance Meeting, Top Fuel 2013
Volume1

Other

OtherLWR Fuel Performance Meeting, Top Fuel 2013
CountryUnited States
CityCharlotte, NC
Period13/9/1513/9/19

ASJC Scopus subject areas

  • Energy Engineering and Power Technology
  • Fuel Technology

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