Greenwire: A major manufacturer of power-generation equipment announced plans today to build a small nuclear reactor that company officials touted as a quot;potential game changer for the global nuclear market.quot; Babcock Wilcox Co.’s 125-megawatt reactor would be significantly smaller than the average 1,000-megawatt nuclear reactor and is aimed at plugging a major quot;market gap,quot; CEO Brandon Bethards said at a Washington press conference. The new reactor might come online as early as …