Toshiba has launched a probe into potential misconduct following the fallout of their US nuclear deal.
Analysts say they vastly overpaid for Westinghouse, which they bought in 2006.
Shares have tumbled 10% after the electronics conglomerate said it would book a $6.3 billion hit.
In the UK, the company building a new nuclear plant in Cumbria has given assurances the project will go ahead, despite Toshiba owning a 60% stake.
Share radio's james Brydges spoke to Seijiro Takeshita, Professor of Management and Information, from the University of Shizuoka.
He told us this was the latest in the long line of setbacks for Toshiba