On 15 January 2014, the Nuclear Regulation Authority (NRA) of Japan provided the IAEA with an update on radioactivity in seawater at TEPCO's Fukushima Daiichi Nuclear Power Station (NPS).
This update on the daily monitoring by TEPCO of seawater near Fukushima Daiichi NPS indicates that the concentrations of all radionuclides (i.e. Cs-134, Cs-137, total Beta and H-3) were relatively stable from 6 to 12 January 2014 at the sampling points T-1 and T-2-1. The sampling points T-1 and T-2-1 near the Fukushima Daiichi NPS are sentinels to assess effects on the environment by incidents including a leakage of contaminated water. The Nuclear Regulation Authority has been closely observing the results of TEPCO's monitoring of seawater at these sampling points.
The NRA also provided an update on the sea area monitoring results for radioactivity obtained from sea water samples taken at a distance of two to 200 kilometers from TEPCO's Fukushima Daiichi NPS.
In addition, the NRA released an information circular from the Ministry of Foreign Affairs of Japan, providing details on a web announcement by TEPCO on the cause of steam emanating from the top of Unit 3 Reactor Building at TEPCO's Fukushima Daiichi NPS, and which also indicates no abnormality there.
A document on Monitoring Air Dose Rates From a Series of Aircraft Surveys 30 Months After the Fukushima Daiichi NPS Accident was posted by the NRA and is available here.