No Tsunami but it attacks back up systems that should have kept the reactors cool by sending false readings to central command.

"Stuxnet;

Stuxnet is a computer worm discovered in June 2010. Stuxnet initially spreads via Microsoft Windows, and targets Siemens industrial software and equipment. While it is not the first time that hackers have targeted industrial systems,[1] it is the first discovered malware that spies on and subverts industrial systems,[2] and the first to include a programmable logic controller (PLC) rootkit.[3][4]

The worm initially spreads indiscriminately, but includes a highly specialized malware payload that is designed to target only Siemens supervisory control and data acquisition (SCADA) systems that are configured to control and monitor specific industrial processes.[5][6] Stuxnet infects PLCs by subverting the Step-7 software application that is used to reprogram these devices."

I read somewhere the machinery used at Fukushima Daichi power plants were from Seimens. The plants themselves were built by GE, who paid of government officials to approve the use of MOX.

This connection made today with Iran is the same one that can be made for Fukushima.