There is some information in the Wikipedia article on the quake:

Onagawa Nuclear Power Plant

A fire from the turbine section of the Onagawa Nuclear Power Plant following the earthquake was reported by Kyodo News.[126][177] The blaze was in a building housing the turbine, which is sited separately from the plant's reactor,[134] and was soon extinguished.[178]

On 13 March the lowest-level state of emergency was declared regarding the Onagawa plant by TEPCO, as radioactivity readings temporarily[179] exceeded allowed levels in the area of the plant.[180][181] TEPCO stated this was due to radiation from the Fukushima I nuclear accidents and not from the Onagawa plant itself.[182]

Tōkai Nuclear Power Plant

The number 2 reactor at Tōkai Nuclear Power Plant was shut down automatically.[125] On 14 March it was reported that a cooling system pump for this reactor had stopped working;[183] however, the Japan Atomic Power Company stated that there was a second operational pump sustaining the cooling system, but that two of three diesel generators used to power the cooling system were out of order.[184]

Brian

• 2011 Tōhoku earthquake and tsunami