Nondestructive burnup determination of spent nuclear fuels

Burnup of the fuel rod and specimens taken from spent nuclear fuel assemblies G23 and C15 discharged from Kori-1 in 1986 and 1982, respectively, was non-destructively determined. And then they were compared with the declared burnup of NPP (nuclear power plant) and destructive chemical burnup. As a result of the comparison, the measured average burnup has a good agreement with the declared burnup within 5 % error in the G23-G2 rod. And there is approximately 4 % difference between the measured and chemically determined burnup at the relatively higher burnup region of the C15-E11 rod, but it appeared to be poor agreement at the lower burnup region in the vicinity of rod ends