Shanghai index jumps 2.4% Updated:2015-04-22 17:03 By Dai Tian (chinadaily.com.cn) Investor smile in a brokerage in Zhejiang, Hangzhou province, on April 22, 2015. Chinese stocks advanced on Wednesday, with the benchmark Shanghai index up 2.4 percent, continuing a seven-year high, led by the brokerage, nuclear electricity and Internet finance sectors.The Shanghai Composite Index jumped 104.87 points to close at 4,398.49, while the Shenzhen Component Index added 2.2 percent to close at 14,749.13.Nuclear electricity companies remained bullish, with machinery maker China First Heavy Industries, Shanghai Electric and Zhejiang Zheneng Electric Power Co surging by the daily limit. Other electricity firms such as Datang International Power Generation Co and SDIC Power Holding advanced 6 and 5.3 percent respectively