Post irradiation examination of "JOYO" MK-I core fuel subassembly (Fab. No. PPJX12) (1); Nondestructive examination on subassembly and its fuel elements

Kodaka, Hideo*; not registered; Ogata, Yoshiaki

Nondestructive Examination of Subassembly and its fuel elements of the "JOYO" MK-I Core Fuel Subassembly (Fab. No. PPJX12, average burnup 38,900 MWD/KTM) has been performed. The purposes of the Examination were for the first time to obtain the detailed irradiation data on this Subassembly which had reached to the next highest burnup throughout the "JOYO" MI-I project, and to investigate the influence of sodium corrosion on the subassembly for which the sodium removal washing had been intentionally net enough performed. The results of the examination are summarized below. (1)The subassembly and its fuel elements showed no failure. (2)In general the irradiation characteristics of the subassembly in each item of PIE were nearly the same as those of the subassembly (Fab. No. PPJX13). (3)No extrarrdinal behaviors have not been found. (4)Sodium corrosion on material surface has not been observed in the present nondestructive examination.