Tokyo Electric Power Co. (9501.TO), or Tepco, in a document sent by Monday to its shareholders, denies that any current or former board members hold responsibility for the Fukushima Daiichi nuclear plant disaster triggered by the March 2011 earthquake and tsunami in northeastern Japan , Kyodo News reported.

The denial comes in a Tepco auditor's notice to shareholders who have asked the utility to file a damages suit against current and former board members, a lawyer for the shareholders, Hiroyuki Kawai, said at a press conference.

After considering reasons cited in the notice against such a suit, Tepco shareholders will file a suit with the Tokyo District Court possibly later this month urging current and some former board members to pay a total of Y5.5 trillion in damages to the company for the disaster.

"The board members had appropriately considered and implemented anti-tsunami measures based on government instructions and approvals," the Tepco notice says, according to Kyodo. "The accident is attributable to the tsunami waves that were far higher than assumed for the measures."

It also said the current board members promptly organized a task force in response to the disaster and made and implemented appropriate decisions to deal with it under a difficult situation.

"None of the board members has violated any law or company statute, nor did they neglect due diligence," the Tepco notice says.