The president and chairman of Tokyo Electric Power Company are likely to step down to take responsibility for a scandal involving false reports on inspections and repairs at the company's nuclear power plants, sources said Saturday.

Formal announcements of the resignations are expected in mid-September, when Tepco reveals the results of an internal investigation into the affair. Sources added that more heads may roll should the scandal turn into a criminal case.

Tepco, the nation's largest utility, is suspected of concealing 29 cases of damage at three nuclear power plants during the 1980s and 1990s. The most serious damage involved cracks in nuclear reactor shrouds. The other cases are not considered to pose safety risks.