8 May 2014
On 8 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 all radionuclides (i.e. Cs-134, Cs-137, total Beta and H-3) have remained low and stable from 28 April to 5 May 2014 at the 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 2 to 200 kilometres from TEPCO's Fukushima Daiichi NPS.
2 May 2014
On 2 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 all radionuclides (i.e. Cs-134, Cs-137, total Beta and H-3) have remained at a low level as indicated in the data collected from 21-28 April 2014 at the 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 2 to 200 kilometres from TEPCO's Fukushima Daiichi NPS.
TEPCO also provided a document outlining an agreement they signed with Sellafield, which is available here.
23 April 2014
On 23 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 at a low level as indicated in the data collected from 14-20 April 2014 at the 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 2 to 200 kilometres from TEPCO's Fukushima Daiichi NPS.
18 April 2014
On 18 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) returned to a low level, as it was described in the previous F-1 Issues that the levels of Cs-134 and Cs-137 at T-1 and T-2-1 and total Beta at T-2-1 on 4 April 2014 were likely to be elevated temporarily. 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 2 to 200 kilometres from TEPCO's Fukushima Daiichi NPS.
16 April 2014
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.
8 April 2014
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.
1 April 2014
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.
25 March 2014
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.
20 March 2014
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.
18 March 2014
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.
11 March 2014
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.
8 March 2014
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.