`` we can not sit on this powder keg any longer , '' vladimir yavorivsky , head of a ukrainian parliamentary commission on chernobyl , told reporters in kiev , 80 miles south of chernobyl. ; yevgeny ignatenko , a spokesman for the ministry of the atomic power industry in moscow , said friday 's fire broke out as a turbine driven by the plant 's no. 2 reactor was being idled for repairs .