TOKYO, Jan 13 (Reuters) - The Nikkei stock average rose to a fresh eight-month for a second straight day on Thursday, after a successful bond auction in Portugal eased fears about the euro zone's debt crisis and boosted European and U.S. stocks.
The benchmark Nikkei was up 0.8 percent, or 84.81 points, at 10,597.61. That was its highest intraday level since May 13, 2010.
The broader Topix added 0.9 percent to 938.36. (Reporting by Antoni Slodkowski; Editing by Chris Gallagher)