Radiation levels in seawater outside one of the crippled Fukushima reactors has spiked to the highest level in two years. That’s according to TEPCO, the operator of the Fukushima nuclear power plant. It said that radiation levels on Wednesday, the day six workers were exposed to highly radioactive water, jumped 13 times the previous day's reading. A TEPCO spokesman said that the sudden spike in radiation was caused by construction work near the No. 2 building.