TOKYO, March 4 : Nuclear reactor restarts in Japan will lift sales at Mitsubishi Heavy Industries' (MHI) nuclear power unit to a record 400 billion yen ($2.54 billion) next business year, well ahead of earlier forecasts, the company's chief financial officer said. "Originally, we were saying it might reach 400 billion yen around 2030," Hiroshi Nishio told Reuters in an interview. MHI will increase headcount in its reactor-making division by about 10 per cent next year as orders grow, he added.