Result of radioactive nuclide analysis for the seawater sampled onshore and offshore of the power station.
Results of radioactive nuclide analysis are published by sampling below items on the premises and the surrounding area of Fukushima Daiichi NPS.
| February 15, 2018 | Analysis of Strontium and Plutonium in the air by the monitoring car at the west gate of the nuclear power station |
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Result of radioactive nuclide analysis for the water sampled near the South Discharge Channel (approximately 280m south of the South Discharge Channel on Unit 1-4 side) in response to the leaked water from the pipeline connecting from Desalination System (Reverse Osmosis Membrane) to Concentrated Water Storage Tank (occurred on March 26 and April 5, 2012).
Real-time data which are updated every 10 minutes started to be published from October 1, 2016.
The subdrain and groundwater drain systems started operations from September 2015. The subdrain system (a measure to prevent the increase of contaminated water) pumps up groundwater from around the reactor buildings before it flows into them. The groundwater drain system (a measure to prevent the leakage of contaminated water) pumps up groundwater held back by the installed seaside impermeable wall before it flows into the port area. The water pumped by either system is purified, tested, and then discharged into the port area.
It is then stored in temporary storage tanks and the radioactive concentration is measured to confirm that the water quality does not surpass the upper limits set by TEPCO.
Third-party organizations also analyze the radioactive concentration to ensure the objectivity of the analysis results.
| TEPCO's upper limit of radioactive concentration for temporary storage tanks | |||||
| Regulatory Notification Limit (for reference) | |||||
| WHO Guideline for Drinking Water |
Related materials about the activities and current operational status of Subdrain and Groundwater drain can be found HERE.
The newest data is on June 14, 2016.
*The analysis of the water sampled before being discharged, which is mixed at the rate of each amount out of the whole amount of discharged water in a month.
As a measure to prevent contaminated water from accumulating, the groundwater bypass has begun its operation since May 2014, which pumps up groundwater on the mountain side before flowing into the buildings and drains the water into the ocean after checking its purity. The pumped up groundwater is once stored in temporary storage tanks, and then its radioactive material concentration is mesured to confirm that its quality meets the operation target.
The third-party organization also analyzes the radioactive material concentration to ensure the objectivity of the analysis result.
| Operation Target | |||||
| Notification Level Limit (Reference) | |||||
| WHO Drinking Water Guideline |
Documents about summary, operational status, and related information of groundwater bypass are HERE.
*The analysis of the water sampled before being discharged, which is mixed at the rate of each amount out of the whole amount of discharged water in a month.
The newest data is on December 16, 2017.
The sampling near the South Water Outlet, at the Drainage Channel, and around tanks in the H4 area has been continued in order to monitor the impact of several leakage accidents such as the leakage from the bottom flange of the No.5 tank in the H4 area I group happened in August, 2013, the dripping from the top plate of the B-A5 tank in the B south area happened in October, 2013, and the leakage from the top plate flange of the C1 tank in the H6 area happened in February, 2014.
The rainwater accumulated inside the dike in the tank area has been sprinkled on the premises of Fukushima Daiichi NPS since May, 2014 after being purified by the desalination system (reverse osmosis membrane) etc.
The newest data is on June 14, 2016.
Results of radioactive nuclide analysis for groundwater at the east side of Unit 1-4 Turbine Buildings and seawater at the port in order to monitor the source, the extent, and the effect of the radioactive materials in the groundwater toward the ocean.
Radioactive materials were detected from the accumulated water inside the pits as a result of purification test at wells (subdrain pits), which is adjacent to Unit 1-4 Buildings at Fukushima Daiichi NPS. Since there is a possibility of being affected by fallout, we installed new observation well around Unit 1-4 Buildings in order to assess the impact of fallout.
The newest data is on October 1, 2014.
Water in each drainage channel is continuously sampled in order to check the impact of radioactive materials on the ocean, since rainwater flows into drainage channels through the ground surface, which was contaminated by the fallout at the time of the accident.
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The groundwater sampled from the leakage detection holes by the undergounrd reservoirs and the surrounding observation holes has been analyzed, and its impact on the surrounding environment has been monitored after the water leakage accident from the underground reservoirs happened in April, 2013.
The leak volume from the underground reservoirs was evaluated as approximatly 20~30 litters after the accident.
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| February 28, 2018 | Seawater collected in offshore area of Ibaraki Prefecture |
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| February 22, 2018 | in the ocean soil off the coast |
| February 16, 2018 | in the ocean soil off the coast |
| February 8, 2018 | Nuclides Analysis Results of the Radioactive Materials in the Air at the Opening of Buildings at Fukushima Daiichi NPS |
English form
| February 9, 2018 | Nuclide analysis results of water at water treatment facility |
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© Tokyo Electric Power Company Holdings, Inc.
The recent data is here.