As reported on Greenpeace International's website:
"Thirty Greenpeace activists entered the Borssele nuclear power plant in Zeeland, Netherlands. On top of the nuclear reactor, a crack has been painted to demonstrate the fact that the power plant is old and not safe and should be closed by 2013, as agreed previously. The Dutch government is reconsidering to keep the nuclear plant open after 2013." (emphasis added)
Greenpeace International also posted a photo of the crack mentioned above.