We have 54 nuclear plants in total.  Before 3.11, NISA said 30% of power energy is rely on nuke.It's 20% of total power facility capacity… 
After the earthquake, 16 plants are in operation. (now 11 plants)
Anyway, rest of 11 plants will be shut down for inspections for 3 months by the next spring under the Electricity Utilities Industry Law.
I can not believe that number, 30%, though once the rest of the power plants get recess, private power facility cost will kill companies in general.
PM Noda will resume operation at nuclear facility to avoid power shortage.
I hope they are ready to do a nuclear stress test properly. 

Video Interview: PM Noda

Japanese Premier Pushes Nuclear-Plant Restarts