On 30 October 2013, the Japanese Nuclear Regulation Authority (NRA) provided the IAEA with its most recent 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 and total Beta in the designated sampling points, even after the rainwater flowed over the dikes on 20 October 2013 due to continued heavy rains.
In addition, the NRA provided the latest sea area monitoring results obtained from samples taken in the vicinity of TEPCO's Fukushima Daiichi Nuclear Power Station and in the open sea.
On 28 October 2013, TEPCO also issued a report related to maintenance of one of the water systems, as well as a document providing an overview of countermeasures that were put in place in preparation for Typhoon Francisco.