On 16 April 2014, Japan provided the IAEA with information about the accidental transfer of contaminated water from the Central Waste Building to the Incineration Building, both located onsite at TEPCO's Fukushima Daiichi Nuclear Power Station (NPS), and which was reported on 13 April 2014. None of this water was reported to have leaked outside.

TEPCO has provided a bit more detailed figure of the configuration here and here.

TEPCO also provided information on a very minor leak here.

2014/04/16

On 8 April 2014, Japan provided the IAEA with an update to current information on radioactivity in seawater at TEPCO's Fukushima Daiichi Nuclear Power Station (NPS).

Japan's Nuclear Regulatory Authority (NRA) continues to closely monitor the radioactivity levels in seawater and reports that levels of Cs-134 and Cs-137 at T-1 and T-2-1, and total Beta at T-2-1 are likely to be elevated temporarily on 4 April 2014. These sampling points near Fukushima NPS are sentinels to assess effects on the environment by incidents including a leakage of contaminated water.

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 kilometres from TEPCO's Fukushima Daiichi NPS.

2014/04/08

On 1 April 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 all radionuclides (i.e. Cs-134, Cs-137, total Beta and H-3) have remained low level as indicated in data recorded from 23 to 29 March 2014 at sampling points T-1 and T-2-1. These sampling points near Fukushima NPS are sentinels to assess effects on the environment by incidents including a leakage of contaminated water.

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 kilometres from TEPCO's Fukushima Daiichi NPS.

2014/04/01

On 25 March 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 the concentrations of all radionuclides (i.e. Cs-134, Cs-137, total Beta and H-3) were relatively stable from 16 to 22 March 2014 at sampling point T-2-1, as well as those of total Beta and H-3 at the sampling point T-1 in the same period. Those of Cs-134 and Cs-137 at the sampling point T-1 indicated a temporary elevation (on 16 and 17 March), and on the following days, they returned to the same low level as reported in previous updates disseminated so far.

These sampling points near Fukushima NPS are sentinels to assess effects on the environment by incidents including a leakage of contaminated water by incidents including a leakage of contaminated water.

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 kilometres from TEPCO's Fukushima Daiichi NPS.

2014/03/25

On 20 March 2014, Japan's Ministry of Foreign Affairs provided information to all Missions and international organizations in Tokyo on the revision of the Concepts of Inspection Planning and the Establishment and Cancellation of Items and Areas to which Restriction of Distribution and/or Consumption of Foods Concerned Applies.

This information is based on a tentative translation of the original document.

2014/03/20

On 18 March 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 the concentrations of all radionuclides (i.e. Cs-134, Cs-137, total Beta and H-3) were relatively stable from 9 to 15 March 2014 at sampling points T-1 and T-2-1. These sampling points near Fukushima NPS are sentinels to assess effects on the environment by incidents including a leakage of contaminated water.

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 kilometres from TEPCO's Fukushima Daiichi NPS.

2014/03/18

On 11 March 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 the concentrations of all radionuclides (i.e. Cs-134, Cs-137, total Beta and H-3) were relatively stable from 2-8 March 2014 at sampling points T-1 and T-2-1. These sampling points near Fukushima NPS are sentinels to assess effects on the environment by incidents including a leakage of contaminated water.

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 kilometres from TEPCO's Fukushima Daiichi NPS.

In addition, the NRA also provided a news release on the continuous monitoring of air doses by helicopter at the Fukushima Daiichi NPS. It highlights air dose rate maps of the Fukushima and its neighboring prefectures, and shows how the distribution of air doses have been reduced.

2014/03/11

The Japanese Government has provided the IAEA with a report that summarizes the events and highlights the progress related to recovery operations at the Fukushima Daiichi Nuclear Power Station. The IAEA has provided its assessments on some aspects of this information which is contained in full at the end of the report.

In general, it is expected that the situation onsite will remain very challenging as the recovery operations progress. Based on the information that has been made available, the IAEA considers that all members of the public are safe and that the food supply is safe and is being appropriately managed.

The Agency welcomes the Japanese Government's issuance of this information to the IAEA Member States and the public, detailing the current status of the recovery operations. The IAEA will continue to share such valuable information as it is provided.

The report can be accessed here.

2014/03/08

On 4 March 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 the concentrations of all radionuclides (i.e. Cs-134, Cs-137, total Beta and H-3) were relatively stable from 23 February to 1 March 2014 at sampling points T-1 and T-2-1. These sampling points near Fukushima NPS are sentinels to assess effects on the environment by incidents including a leakage of contaminated water.

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 kilometres from TEPCO's Fukushima Daiichi NPS.

2014/03/04

On 28 February 2014, Japan provided the IAEA with an information update, stating that they have taken actions in response to a sample of hilgendorf saucord (a type of fish) caught offshore in the Fukushima region which was monitored and found to exceed their national criteria for distribution to markets.

This situation shows the capability of the monitoring program in Japan to detect food which exceeds their national criteria and to take appropriate measures in response.

The Agency considers this information provides good assurance on the quality of the management and the safety of the food supply chain.

Additional information on the monitoring of fish products in the Fukushima region (and beyond) can be found here.

2014/02/28

On 26 February 2014, Japan provided the IAEA with an update on radioactivity in seawater at TEPCO's Fukushima Daiichi Nuclear Power Station (NPS).

The report mentions the water leak reported by TEPCO to the Nuclear Regulation Authority of Japan (NRA) on 15 and 16 February 2014. Two other TEPCO documents provide more information on the leak. They are available here and here. Additionally TEPCO had an issue with the Spent Fuel Pool in Unit 4 and halted the fuel removal process for several hours.

Based on current information presented in this update, the concentrations of all radionuclides (i.e. Cs-134, Cs-137, total Beta and H-3) indicate no significant change before and after the occurrence of the water leakage. The concentration of Cs-134 and Cs-137 at the sampling points T-1 and T-2-1 in the period from 10 December 2013 to 22 February 2014 have remained below the limit values of concentration.

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 kilometres from TEPCO's Fukushima Daiichi NPS.

2014/02/26

On 21 February 2014, 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 10 to 18 February 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 updated information also provides details on the incidents of water leakage at the Fukushima Daiichi NPS that was reported by TEPCO to the Nuclear Regulation Authority of Japan (NRA) on 15 and 16 February 2014.

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.

2014/02/21