Jiji Press, May 16, 2014: Radiation Levels Hit Record Highs in Fukushima Seawater — Record-high radiation levels have been observed at five monitoring points […] TEPCO said Friday. The findings followed a recent series of record-high levels of radiation detected in groundwater at the plant […] TEPCO officials said that the cause of the rises in seawater radiation levels is unknown. […] 1,900 becquerels per liter of tritium was detected in seawater sampled Monday from a point between the water intakes for the No. 2 and No. 3 reactors at the plant, up from the previous record high of 1,400 becquerels […] At a nearby point, tritium levels rose to 1,400 becquerels from the previous record of 1,200 becquerels.

Japan Times, May 17, 2014:Record high radiation in seawater off Fukushima plant — Radiation has spiked to all-time highs at five monitoring points in waters adjacent to the crippled Fukushima No. 1 power station [Tepco] said […] measurements follow similar highs detected in groundwater at the plant. Officials of Tepco […] said the cause of the seawater spike is unknown. […] at a point between the water intakes for the No. 1 and No. 2 reactors, seawater sampled Thursday was found to contain 840 becquerels of strontium-90, which causes bone cancer, and other beta ray-emitting isotopes, up from a previous record of 540 becquerels. At two monitoring sites outside the port, seawater was found Monday to contain 8.7 becquerels and 4.3 becquerels of tritium. The second site was about 3 km away.

See the latest monitoring results here (pdf)