Kashiwazaki, Japan, Quake hits nuke reactor; An earthquake measuring 6.7 on the Ricter scale rattled a nuclear power plant in northern Japan this week, causing leakage of radioactive water. Tokyo Electric Power officials said the earthquake caused fires and burst pipes in 50 Separate areas, but they insisted the leakage posed no safety risk, Others are skeptical.Earthquake engineer Masanori Hamada said