Results of Analysis (April, 2019)
Air
* Radioactive nuclide analysis for the air sampled on the west gate of the nuclear plant, 3 points near the site boundary (MP-1,3,8), 3 points around Unit 1-4 (Unit 1 north side slope, Unit 1-2 west side slope, Unit 3-4 west side slope) and the sea side area near Unit 1-4 are discontinued after August 30, 2017. Monitoring with the continuous dust monitors already installed at the site has been implemented.
<Reference: Radioactive Concentration measured at Dust Monitors near the Site Boundary of Fukushima Daiichi Nuclear Power Station>
http://www.tepco.co.jp/en/nu/fukushima-np/f1/dustmonitor/index-e.html
* Analysis of Strontium and Plutonium in the air are continuously carried out every six months (April and October) by the monitoring car at the west gate of the nuclear plant.
Seawater
Seawater near Power Station
English form
Result of radioactive nuclide analysis for the seawater sampled near the coast 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.
* Results of Radioactive Nuclide Analysis for Seawater near Power Station and near Intake Canals by Unit 1-4 side
“Result of Radioactive nuclide analysis for the seawater sampled near the coast of the power station” data and “Result of radioactive nuclide analysis for seawater sampled near the intake canals by the side of Unit 1-4 turbine” data have been placed here (on the page for seawater contained in pdf files uploaded at “Monitoring at the East side of Unit 1-4 Turbine Buildings”) since April 2, 2019.
Charts, results of detailed analysis by further measuring and results of analysis for other sampling points etc. are posted in the same way as before.
Seawater near South Discharge Channel on Unit 1-4 side
* "Result of radioactive nuclide analysis for Seawater near South Discharge Channel on Unit 1-4 side" data have been placed here (on the page for seawater contained in pdf files uploaded at “Monitoring at the East side of Unit 1-4 Turbine Buildings”) since September 2018.
Seawater at Port Entrance
(measurement by radiation monitor)
Real-time data which are updated every 10 minutes started to be published from October 1, 2016.
Subdrain Water
Subdrain Water near the Turbine Buildings
English form
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 from Subdrain and Groundwater Drain
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.
| |
Cesium 134 |
Cesium 137 |
Gross β |
Strontium |
Tritium |
| TEPCO's upper limit of radioactive concentration for temporary storage tanks |
1Bq/l |
1Bq/l |
3Bq/l |
- |
1500Bq/l |
| Regulatory Notification Limit (for reference) |
60Bq/l |
90Bq/l |
- |
30Bq/l |
60000Bq/l |
| WHO Guideline for Drinking Water |
10Bq/l |
10Bq/l |
- |
10Bq/l |
10000Bq/l |
Related materials about the activities and current operational status of Subdrain and Groundwater drain can be found HERE.
Analysis Results of Relay Tanks
English form
The newest data is on June 14, 2016.
Analysis Results of Temporary Storage Tanks and Water Collecting Tanks
English form
Analysis Results of Weighted Average Sampling
*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
The newest data is on March 19, 2019
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
Highest Dose English form
Analysis Results of Temporary Storage Tanks
English form
Analysis Results of Weighted Average Sampling
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
The newest data is on March 19, 2019
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
*"South Water Outlet" data has been placed here, "Drainage Channel" data has been placed here after September 2018.
Observation Hole around H4 Area
Highest Dose English form
Observation Hole around H6 Area
Highest Dose 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
The newest data is on June 14, 2016.
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.
Highest Dose 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.
Sampling Results of Drainage Water at Fukushima Daiichi Nuclear Power Station
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.
Highest Dose English form
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
| April 30, 2019 |
Nuclide Analysis Results of the Underground Bypass (Investigation Holes/Pumping Well) and the Sea Side Observation Holes (As of April 29) |
| April 28, 2019 |
Underground Reservoir Tritium Analysis Results (As of April 26) |
| April 27, 2019 |
Underground Reservoir Nuclide Analysis Results (As of April 26) |
| April 26, 2019 |
Underground Reservoir Nuclide Analysis Results (As of April 25) |
| April 25, 2019 |
Underground Reservoir Nuclide Analysis Results (As of April 24) |
| April 24, 2019 |
Tritium Analysis Results of the Underground Bypass (Investigation Holes/Pumping Well) and the Sea Side Observation Holes (As of April 22) |
| April 24, 2019 |
Underground Reservoir Observation Holes Nuclide Analysis Results (As of April 23) |
| April 23, 2019 |
Nuclide Analysis Results of the Underground Bypass (Investigation Holes/Pumping Well) and the Sea Side Observation Holes (As of April 22) |
| April 21, 2019 |
Underground Reservoir Tritium Analysis Results (As of April 19) |
| April 20, 2019 |
Underground Reservoir Observation Holes Nuclide Analysis Results (As of April 19) |
| April 20, 2019 |
Underground Reservoir Nuclide Analysis Results (As of April 19) |
| April 20, 2019 |
Underground Reservoir Tritium Analysis Results (As of April 18) |
| April 19, 2019 |
Underground Reservoir Nuclide Analysis Results (As of April 18) |
| April 18, 2019 |
Underground Reservoir Nuclide Analysis Results (As of April 17) |
| April 17, 2019 |
Underground Reservoir Observation Holes Nuclide Analysis Results (As of April 16) |
| April 17, 2019 |
Tritium Analysis Results of the Underground Bypass (Investigation Holes/Pumping Well) and the Sea Side Observation Holes (As of April 15) |
| April 16, 2019 |
Nuclide Analysis Results of the Underground Bypass (Investigation Holes/Pumping Well) and the Sea Side Observation Holes (As of April 15) |
| April 14, 2019 |
Underground Reservoir Tritium Analysis Results (As of April 12) |
| April 13, 2019 |
Underground Reservoir Nuclide Analysis Results (As of April 12) |
| April 12, 2019 |
Underground Reservoir Nuclide Analysis Results (As of April 11) |
| April 11, 2019 |
Underground Reservoir Nuclide Analysis Results (As of April 10) |
| April 10, 2019 |
Tritium Analysis Results of the Underground Bypass (Investigation Holes/Pumping Well) and the Sea Side Observation Holes (As of April 8) |
| April 10, 2019 |
Underground Reservoir Observation Holes Nuclide Analysis Results (As of April 9) |
| April 9, 2019 |
Nuclide Analysis Results of the Underground Bypass (Investigation Holes/Pumping Well) and the Sea Side Observation Holes (As of April 8) |
| April 6, 2019 |
Underground Reservoir Nuclide Analysis Results (As of April 5) |
| April 6, 2019 |
Underground Reservoir Tritium Analysis Results (As of April 4) |
| April 5, 2019 |
Underground Reservoir Nuclide Analysis Results (As of April 4) |
| April 5, 2019 |
Underground Reservoir Tritium Analysis Results (As of April 3) |
| April 4, 2019 |
Underground Reservoir Nuclide Analysis Results (As of April 3) |
| April 3, 2019 |
Tritium Analysis Results of the Underground Bypass (Investigation Holes/Pumping Well) and the Sea Side Observation Holes (As of April 1) |
| April 3, 2019 |
Underground Reservoir Observation Holes Nuclide Analysis Results (As of April 2) |
| April 2, 2019 |
Nuclide Analysis Results of the Underground Bypass (Investigation Holes/Pumping Well) and the Sea Side Observation Holes (As of April 1) |
Other
open
The recent data is here.