On 27 May 2014, Japan provided the IAEA with an?update?to current information on radioactivity in seawater at TEPCO's Fukushima Daiichi Nuclear Power Station (NPS).

The update shows that TEPCO has reported to the Nuclear Regulation Authority (NRA) that it discharged 561 tonnes of groundwater to the ocean by means of the groundwater bypass system on 21 May 2014. TEPCO also reported to the NRA that it discharged 641 tonnes of groundwater to the ocean on 27 May 2014. The update further provides measurements of seawater obtained at the sampling points T-1 and T-2-1 on 22 to 24 May which are taken at early morning every day. The effects of groundwater discharge had no recognizable effect in these measurement.

The NRA also provided an update of?sea area monitoring results?for radioactivity obtained from sea water samples taken at a distance of 2 to 200 kilometres from TEPCO's Fukushima Daiichi NPS.