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成川 隆文; 天谷 政樹
Journal of Nuclear Science and Technology, 53(11), p.1758 - 1765, 2016/11
被引用回数：10 パーセンタイル：67.99(Nuclear Science & Technology)In order to investigate the effect of azimuthal temperature distribution on the ballooning and rupture behavior of Zircaloy-4 (Zry-4) cladding tube, laboratory-scale experiments on non-irradiated Zry-4 cladding tube specimens were performed under transient-heating conditions which simulate loss-of-coolant-accident (LOCA) conditions by using an external heating method, and the data obtained were compared to those from a previous study where an internal heating method was used. The maximum circumferential strains (
s) of the cladding tube specimens were firstly divided by the engineering hoop stress (
). The divided maximum circumferential strains, 
s, of the previous study, which used the internal heating method, were then corrected based on the azimuthal temperature difference (ATD) in the cladding tube specimen. The s for the external heating method which was used in this study agreed fairly well with the corrected s obtained in the previous study which employed the internal heating method in the burst temperature range below 
1200 K. Also, the area of rupture opening tended to increase with increasing of the value which is defined as multiplied by . From the results obtained in this study, it was suggested that and the size of rupture opening of a cladding tube under LOCA-simulated conditions can be estimated mainly by using , and ATD in the cladding tube specimen, irrespective of heating methods.
成川 隆文; 天谷 政樹
Journal of Nuclear Science and Technology, 53(1), p.112 - 122, 2016/01
被引用回数：7 パーセンタイル：54.81(Nuclear Science & Technology)In order to investigate the effect of oxidation and crystal phase condition on the ballooning and rupture behaviors of cladding tube under simulated loss-of-coolant-accident (LOCA) conditions, laboratory-scale experiments were performed in which internally pressurized non-irradiated Zircaloy-4 (Zry-4) cladding specimens were heated to burst in steam and argon gas conditions. Values of the maximum circumferential strain were normalized by dividing them by engineering hoop stress at the time of rupture. The dependence of the normalized value on burst temperature and the relationship between the normalized value and the length, width and area of rupture opening were evaluated. The correlation between the normalized value and the burst temperature suggested that the fraction of the 
phase in Zry-4 cladding specimens affected the strain in the specimens and the oxidation of specimens suppressed the amount of ballooning of the specimens. The relationship between the normalized value and the length, width and area of rupture opening indicated that the length, width and area of rupture opening depended on the crystal phase condition in Zry-4 cladding specimens irrespective of atmosphere in the case of the heating rate of 3 K/s.
成川 隆文
no journal, ,
Laboratory-scale burst tests on non-irradiated Zircaloy-4 cladding tube specimens were performed under transient-heating conditions using an external heating method. Then the obtained data were compared to those from a previous study, where an internal heating method was used. This comparison suggests that the amount of deformation in the ballooned region may be estimated based on engineering hoop stress, azimuthal temperature difference in the cladding, and the maximum circumferential strain divided by engineering hoop stress, 
, which was obtained in this study, irrespective of heating method. The size of rupture opening may be affected by both the azimuthal and axial temperature differences in the cladding.
