A problem at the switch board at a transformer substation led to a power shortage at 2:30 p.m. (0530 GMT), the company said.
"It is probable that at least half of the chips already in the fabrication process will have to be discarded," said Lee Min-hee, an analyst for Dongbu Securities.
"Taking into account another two weeks for ramp-up of the lines after cleanup, Samsung could very well lose a month's worth of chip shipment," he said.
"When the power goes down, some of the wafers die in the process and they ... become obsolete," said Lee.
Overall NAND production at Samsung is likely to be particularly affected by the outage in Line 14, an advanced NAND flash line using larger wafers.(300 MM)
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