On 23 October 2013, the Japanese Nuclear Regulation Authority (NRA) provided the IAEA with an update on radioactivity in seawater at TEPCO's Fukushima Daiichi Nuclear Power Station (NPS).
The NRA report notes no significant increase in the concentrations of Cs-134 and Cs-137 in the designated sampling points as compared to the previous week, even after the typhoon that passed over the Nuclear Power Station in the period 14-16 October 2013.
In addition, the NRA provided a monitoring report of sea area radioactivity obtained from samples taken in the vicinity of TEPCO's Fukushima Daiichi NPS and in the open sea.
At the same time, TEPCO has issued a report detailing specific counter measures implemented due to the heavy rain several days ago.