Fig.5-9 Calculated temperature distribution of cladding Fig.5-10 Axial and hoop stresses in the inner and outer sides of cladding, analyzed in FK-10 experiment

Fig.5-9(left) Calculated temperature distribution of cladding Fig.5-10(right) Axial and hoop stresses in the inner and outer sides of cladding, analyzed in FK-10 experiment

Fig.5-9(left) Calculated temperature distribution of cladding

#2, #3 and #5 are ring elements between the inner and outer sides. Upon pulse power input, the temperature rises faster in the inner region than the outer region. PCMI-failure time was observed. Temperature difference between the inner and outer sides is as much as 400C at the failure instant.

Fig.5-10(right) Axial and hoop stresses in the inner and outer sides of cladding, analyzed in FK-10 experiment

Stress is mitigated in the inner side of cladding by thermal expansion, and stress in the outer side is relatively higher. The rod failed when a slight plastic deformation occurred, indicating a low-strain breakage mechanism.

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