TY - GEN
T1 - Study of mechanism for corrosion and hydrogen absorption of high burnup fuel cladding
AU - Saiki, Y.
AU - Kakiuchi, K.
AU - Kishita, H.
AU - Muta, H.
AU - Yamanaka, S.
AU - Hatakeyama, M.
AU - Konashi, K.
AU - Shikama, T.
AU - Uno, M.
AU - Terai, T.
AU - Oyama, K.
PY - 2013
Y1 - 2013
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=84902339866&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84902339866&partnerID=8YFLogxK
M3 - Conference contribution
AN - SCOPUS:84902339866
SN - 9781629937212
T3 - LWR Fuel Performance Meeting, Top Fuel 2013
SP - 110
EP - 114
BT - LWR Fuel Performance Meeting, Top Fuel 2013
PB - American Nuclear Society
T2 - LWR Fuel Performance Meeting, Top Fuel 2013
Y2 - 15 September 2013 through 19 September 2013
ER -