Nikkei rose sharply high early Monday, hitting a 6.5-month high above 9,500. The market was lifted by the optimistic expectation for export on weaker yen. In the first 15 minutes of trading, the 225-issue Nikkei Stock Average rose 154.36 points, or 1.64 percent, from Friday to 9,538. 53, trading at its highest intraday level since 9,768.40 marked on Aug. 4. The broader Topix index of all First Section issues on the Tokyo Stock Exchange was up 12.16 points, or 1.50 percent, to 822. 61.