But slower releases caused tremendous damage, he said.
It warned that an earthquake of magnitude 8 or above could cause "tremendous damage".
It has already caused tremendous damage both financially and politically and taken an extensive human toll as well.
"Japan's invasions caused tremendous damage to the Chinese," Mr Wen said in the first address to the Japanese parliament by a senior Chinese politician for 22 years.
But the drop over the last three years, however necessary, has caused tremendous damage to wallets and to the lubricant of commerce, confidence in the future.
Although unlikely to kill a large number of people, such a device could cause tremendous damage and disruption by creating large no-go areas contaminated by radioactivity.
Mr. Onodera acknowledged, as he has done before, that Japan had caused "tremendous damage and suffering" to many Asian nations, and he emphasized previous Japanese apologies.
He warned that the breaks not only waste millions of gallons of clean, treated drinking water, but also can cause tremendous damage, pointing to a major break in Maryland just before Christmas that stranded motorists on a flooded road.
At the time, Murayama said that Japan, "through its colonial rule and aggression, caused tremendous damage and suffering to the people of many countries, particularly to those of Asian nations".
A broader apology by Prime Minister Tomiichi Murayama in 1995 conceded that "through its colonial rule and invasion," Japan had caused "tremendous damage and suffering to the people of many countries, particularly to those of Asian nations".
