Results of Radioactive Analysis around Fukushima Daiichi Nuclear Power Station
Results of radioactive nuclide analysis are published by sampling below items on the premises and the surrounding area of Fukushima Daiichi NPS.
Prompt Report of Analysis Results (May, 2015)
Air
Air on the premises of Power Station
English form
Result of radioactive nuclide analysis for the air sampled on the premises of the power station.
Seawater
Seawater near Power Station
English form
Result of radioactive nuclide analysis for the seawater sampled onshore and offshore of the power station.
Seawater near Intake Canals by Unit 1-4 side
English form
Result of radioactive nuclide analysis for the seawater sampled near the intake canals by the side of Unit 1-4 turbine buildings.
Leaked Water near South Discharge Cannel on Unit 1-4 side
English form
- *The sampling location has been changed on November 26, 2012. (Sampling is performed at approx. 1km south of the previous location.)
Result of radioactive nuclide analysis for the water sampled near the South Discharge Channel (approximately 330m 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).
Seawater near Port Entrance
(Measurement by Radiation Monitor)
English form
The concentration level of radioactive materials included in sea water around the port entrance of the power station is measured continuously through a seawater radiation monitor.
(Starting operation from April 1, 2015)
Subdrain Water
Subdrain Water near the Turbine Buildings
English form
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Result of radioactive nuclide analysis for the water sampled from the subdrain system near Unit 1-6 turbine buildings.
Subdrain Water around Centralized Radiation Waste Treatment Facility
English form
Result of radioactive nuclide analysis for the water sampled from the subdrain around the centralized waste treatment facility.
Sampling regarding Groundwater Bypass
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.
| |
Cesium 134 |
Cesium 137 |
Gross β |
Strontium |
Tritium |
| Operation Target |
1Bq/l |
1Bq/l |
5Bq/l |
- |
1500Bq/l |
| Notification Level Limit (Reference) |
60Bq/l |
90Bq/l |
- |
30Bq/l |
60000Bq/l |
| WHO Drinking Water Guideline |
10Bq/l |
10Bq/l |
- |
10Bq/l |
10000Bq/l |
Documents about summary, operational status, and related information of groundwater bypass are HERE.
Analysis Results of Pump Well
English form
Analysis Results of Temporary Storage Tanks
English form
Result of weighted average sample analysis for groundwater bypass at Fukushima Daiichi Nuclear Power Station
English form
*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.
Analysis Results Regarding Discharge
English form
Monitoring regarding Water Leakage Tanks
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.
South Water Outlet, Drainage Channel
English form
Observation Hole around H4 Area
English form
Observation Hole around H6 Area
English form
Analysis Results of Rainwater sprinkling Obtained Inside the Dike in the Tank Area After Treated by the Rainwater Treatment System
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.
English form
Monitoring at the East Side of Unit 1-4 Turbine Buildings
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.
English form
Detailed Analysis Results of Groundwater around Unit 1-4 Buildings
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.
Analysis Results of Underground Reservoirs
open
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.
English form
| May 29, 2015 |
Underground Reservoir Tritium Analysis Results (As of May 22) |
| May 29, 2015 |
Underground Reservoir Nuclide Analysis Results (As of May 28) |
| May 28, 2015 |
Underground Reservoir Nuclide Analysis Results (As of May 27) |
| May 27, 2015 |
Underground Reservoir Observation Holes Nuclide Analysis Results (As of May 26) |
| May 26, 2015 |
Tritium Analysis Results of the Underground Bypass (Investigation Holes/Pumping Well) and the Sea Side Observation Holes (As of May 18) |
| May 26, 2015 |
Nuclide Analysis Results of the Underground Bypass (Investigation Holes/Pumping Well) and the Sea Side Observation Holes (As of May 25) |
| May 23, 2015 |
Underground Reservoir Nuclide Analysis Results (As of May 22) |
| May 22, 2015 |
Underground Reservoir Tritium Analysis Results (As of May 15) |
| May 22, 2015 |
Underground Reservoir Nuclide Analysis Results (As of May 21) |
| May 21, 2015 |
Underground Reservoir Nuclide Analysis Results (As of May 20) |
| May 20, 2015 |
Underground Reservoir Observation Holes Nuclide Analysis Results (As of May 19) |
| May 19, 2015 |
Tritium Analysis Results of the Underground Bypass (Investigation Holes/Pumping Well) and the Sea Side Observation Holes (As of May 11) |
| May 19, 2015 |
Nuclide Analysis Results of the Underground Bypass (Investigation Holes/Pumping Well) and the Sea Side Observation Holes (As of May 18) |
| May 16, 2015 |
Underground Reservoir Nuclide Analysis Results (As of May 15) |
| May 15, 2015 |
Underground Reservoir Tritium Analysis Results (As of May 7 and 8) |
| May 15, 2015 |
Underground Reservoir Nuclide Analysis Results (As of May 14) |
| May 14, 2015 |
Underground Reservoir Tritium Analysis Results (As of May 6) |
| May 14, 2015 |
Underground Reservoir Nuclide Analysis Results (As of May 13) |
| May 13, 2015 |
Underground Reservoir Observation Holes Nuclide Analysis Results (As of May 12) |
| May 12, 2015 |
Tritium Analysis Results of the Underground Bypass (Investigation Holes/Pumping Well) and the Sea Side Observation Holes (As of May 4) |
| May 12, 2015 |
Nuclide Analysis Results of the Underground Bypass (Investigation Holes/Pumping Well) and the Sea Side Observation Holes (As of May 11) |
| May 9, 2015 |
Underground Reservoir Nuclide Analysis Results (As of May 8) |
| May 8, 2015 |
Underground Reservoir Nuclide Analysis Results (As of May 7) |
| May 7, 2015 |
Underground Reservoir Tritium Analysis Results (As of April 29) |
| May 7, 2015 |
Underground Reservoir Nuclide Analysis Results (As of May 6) |
| May 6, 2015 |
Tritium Analysis Results of the Underground Bypass (Investigation Holes/Pumping Well) and the Sea Side Observation Holes (As of April 27 and 28) |
| May 6, 2015 |
Underground Reservoir Observation Holes Nuclide Analysis Results (As of May 5) |
| May 5, 2015 |
Nuclide Analysis Results of the Underground Bypass (Investigation Holes/Pumping Well) and the Sea Side Observation Holes (As of May 4) |
| May 2, 2015 |
Underground Reservoir Nuclide Analysis Results (As of May 1) |
| May 1, 2015 |
Nuclide Analysis Results of the Underground Reservoir/Underground Reservoir Observation Holes (As of April 30) |
Other
open
| May 29, 2015 |
Seawater collected in offshore area of Ibaraki Prefecture |
| May 27, 2015 |
Nuclide Analysis of the Radioactive Materials in the Fallouts obtained inside and outside of Fukushima Daiichi NPS Nuclides Analysis Result of the Radioactive Materials in the Air at the Upper Part of Unit 1 Reactor Building Nuclides Analysis Result of the Radioactive Materials in the Air at the Exhaust Facility of Unit 2 Reactor Building Nuclides Analysis Result of the Radioactive Materials in the Air at the Upper Part of Unit 3 Reactor Building Nuclides Analysis Result of the Radioactive Materials in the Air at the Upper Part of Unit 4 Reactor Building Gas Sampling Results of Unit 1 PCV Gas Control System Conducted at Fukushima Daiichi NPS Gas Sampling Results of Unit 2 PCV Gas Control System Conducted at Fukushima Daiichi NPS Gas Sampling Results of Unit 3 PCV Gas Control System Conducted at Fukushima Daiichi NPS Nuclides Analysis Result of the Radioactive Materials in the Air at the Opening of Buildings at Fukushima Daiichi NPS (1) Nuclides Analysis Result of the Radioactive Materials in the Air at the Opening of Buildings at Fukushima Daiichi NPS (2) |
| May 24, 2015 |
Nuclides Analysis Result of Unit 1 discharge channel at Fukushima Daiichi NPS |
| May 22, 2015 |
Nuclides Analysis Result of Unit 1 discharge channel at Fukushima Daiichi NPS |
| May 20, 2015 |
Nuclides Analysis Result of Unit 1 discharge channel at Fukushima Daiichi NPS |
| May 18, 2015 |
Analysis result of seawater sample:Yotsukura beach, Nakoso beach in Fukushima Prefecture |
| May 17, 2015 |
Nuclides Analysis Result of Unit 1 discharge channel at Fukushima Daiichi NPS |
| May 15, 2015 |
Nuclides Analysis Result of Unit 1 discharge channel at Fukushima Daiichi NPS |
| May 14, 2015 |
in the ocean soil off the coast |
| May 13, 2015 |
Nuclides Analysis Result of Unit 1 discharge channel at Fukushima Daiichi NPS |
| May 12, 2015 |
Seawater collected in offshore area of Miyagi Prefecture |
| May 10, 2015 |
Nuclides Analysis Result of Unit 1 discharge channel at Fukushima Daiichi NPS |
| May 8, 2015 |
Nuclides Analysis Result of Unit 1 discharge channel at Fukushima Daiichi NPS |
| May 6, 2015 |
Nuclides Analysis Result of Unit 1 discharge channel at Fukushima Daiichi NPS |
| May 3, 2015 |
Nuclides Analysis Result of Unit 1 discharge channel at Fukushima Daiichi NPS |
| May 1, 2015 |
Nuclides Analysis Result of Unit 1 discharge channel at Fukushima Daiichi NPS |
English form
The recent data is here.