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Decommissioning Plan of Fukushima Daiichi Nuclear Power > Plan & Action > Monitoring by sampling

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Monitoring by sampling

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.

Analysis results of radioactive materials obtained at each sampling location

map

1.Seawater(Area around the Outside of the Port) 2.Seawater(Inside of the Port) 3.Seawater(Inside of Unit 1-4 Water Intake Channel) 4.Groundwater(Unit 1-4 Bank Protection) 5.Groundwater Obtained around the H4 area 6.Obtained in Drainage Channels around the H4 area and the B area

Prompt Report of Analysis Results (June, 2016)

The date colored yellow provides the latest data.

Air

Air on the premises of Power Station

English form

Sun Mon Tue Wed Thu Fri Sat
      1 2 3 4
5 6 7 8 9 10 11
12 13 14 15 16 17 18
19 20 21 22 23 24 25
26 27 28 29 30    

Result of radioactive nuclide analysis for the air sampled on the premises of the power station.

Seawater

Seawater near Power Station

English form

Sun Mon Tue Wed Thu Fri Sat
      1 2 3 4
5 6 7 8 9 10 11
12 13 14 15 16 17 18
19 20 21 22 23 24 25
26 27 28 29 30    

CSV

English form

Coast

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

Sun Mon Tue Wed Thu Fri Sat
      1 2 3 4
5 6 7 8 9 10 11
12 13 14 15 16 17 18
19 20 21 22 23 24 25
26 27 28 29 30    

CSV

English form

Around water intake channel

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

Sun Mon Tue Wed Thu Fri Sat
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12 13 14 15 16 17 18
19 20 21 22 23 24 25
26 27 28 29 30    
  • *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

Sun Mon Tue Wed Thu Fri Sat
      1 2 3 4
5 6 7 8 9 10 11
12 13 14 15 16 17 18
19 20 21 22 23 24 25
26 27 28 29 30    

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.

Subdrain Water

Subdrain Water near the Turbine Buildings

English form

Sun Mon Tue Wed Thu Fri Sat
      1 2 3 4
5 6 7 8 9 10 11
12 13 14 15 16 17 18
19 20 21 22 23 24 25
26 27 28 29 30    

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

Sun Mon Tue Wed Thu Fri Sat
      1 2 3 4
5 6 7 8 9 10 11
12 13 14 15 16 17 18
19 20 21 22 23 24 25
26 27 28 29 30    

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

Analysis Results of Temporary Storage Tanks and Water Collecting Tanks

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

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

Analysis Results of Temporary Storage Tanks

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

 

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

Observation Hole around H4 Area

Observation Hole around H6 Area

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

June 26, 2016 Underground Reservoir Nuclide Analysis Results (As of June 25)
June 26, 2016 Underground Reservoir Tritium Analysis Results (As of June 24)
June 26, 2016 Underground Reservoir Observation Holes Nuclide Analysis Results(As of June 25)
June 25, 2016 Tritium Analysis Results of the Underground Bypass (Investigation Holes/Pumping Well) and the Sea Side Observation Holes (As of June 23)
June 25, 2016 Underground Reservoir Nuclide Analysis Results (As of June 24)
June 25, 2016 Underground Reservoir Observation Holes Nuclide Analysis Results(As of June 24)
June 24, 2016 Underground Reservoir Observation Holes Nuclide Analysis Results(As of June 23)
June 24, 2016 Underground Reservoir Nuclide Analysis Results (As of June 23)
June 24, 2016 Underground Reservoir Tritium Analysis Results (As of June 22)
June 24, 2016 Nuclide Analysis Results of the Underground Bypass (Investigation Holes/Pumping Well) and the Sea Side Observation Holes (As of June 23)
June 23, 2016 Underground Reservoir Observation Holes Nuclide Analysis Results(As of June 22)
June 23, 2016 Underground Reservoir Nuclide Analysis Results (As of June 22)
June 22, 2016 Tritium Analysis Results of the Underground Bypass (Investigation Holes/Pumping Well) and the Sea Side Observation Holes (As of June 20)
June 22, 2016 Underground Reservoir Nuclide Analysis Results (As of June 21)
June 22, 2016 Underground Reservoir Observation Holes Nuclide Analysis Results(As of June 21)
June 21, 2016 Nuclide Analysis Results of the Underground Bypass (Investigation Holes/Pumping Well) and the Sea Side Observation Holes (As of June 20)
June 21, 2016 Underground Reservoir Nuclide Analysis Results (As of June 20)
June 21, 2016 Underground Reservoir Observation Holes Nuclide Analysis Results(As of June 20)
June 20, 2016 Underground Reservoir Nuclide Analysis Results (As of June 19)
June 20, 2016 Underground Reservoir Observation Holes Nuclide Analysis Results(As of June 19)
June 19, 2016 Underground Reservoir Tritium Analysis Results (As of June 17)
June 19, 2016 Underground Reservoir Nuclide Analysis Results (As of June 18)
June 19, 2016 Underground Reservoir Observation Holes Nuclide Analysis Results(As of June 18)
June 18, 2016 Nuclide Analysis Results of the Underground Bypass (Investigation Holes/Pumping Well) and the Sea Side Observation Holes (As of June 16)
June 18, 2016 Underground Reservoir Nuclide Analysis Results (As of June 17)
June 18, 2016 Underground Reservoir Observation Holes Nuclide Analysis Results(As of June 17)
June 17, 2016 Underground Reservoir Nuclide Analysis Results (As of June 16)
June 17, 2016 Underground Reservoir Tritium Analysis Results (As of June 15)
June 17, 2016 Nuclide Analysis Results of the Underground Bypass (Investigation Holes/Pumping Well) and the Sea Side Observation Holes (As of June 16)
June 17, 2016 Underground Reservoir Observation Holes Nuclide Analysis Results(As of June 16)
June 16, 2016 Underground Reservoir Nuclide Analysis Results (As of June 15)
June 16, 2016 Underground Reservoir Observation Holes Nuclide Analysis Results(As of June 15)
June 15, 2016 Tritium Analysis Results of the Underground Bypass (Investigation Holes/Pumping Well) and the Sea Side Observation Holes (As of June 13)
June 15, 2016 Underground Reservoir Nuclide Analysis Results (As of June 14)
June 15, 2016 Underground Reservoir Observation Holes Nuclide Analysis Results(As of June 14)
June 14, 2016 Nuclide Analysis Results of the Underground Bypass (Investigation Holes/Pumping Well) and the Sea Side Observation Holes (As of June 13)
June 14, 2016 Underground Reservoir Nuclide Analysis Results (As of June 13)
June 14, 2016 Underground Reservoir Observation Holes Nuclide Analysis Results(As of June 13)
June 13, 2016 Underground Reservoir Nuclide Analysis Results (As of June 12)
June 13, 2016 Underground Reservoir Observation Holes Nuclide Analysis Results(As of June 12)
June 12, 2016 Underground Reservoir Tritium Analysis Results (As of June 10)
June 12, 2016 Underground Reservoir Observation Holes Nuclide Analysis Results(As of June 11)
June 12, 2016 Underground Reservoir Nuclide Analysis Results (As of June 11)
June 11, 2016 Tritium Analysis Results of the Underground Bypass (Investigation Holes/Pumping Well) and the Sea Side Observation Holes (As of June 9)
June 11, 2016 Underground Reservoir Nuclide Analysis Results (As of June 10)
June 11, 2016 Underground Reservoir Observation Holes Nuclide Analysis Results(As of June 10)
June 10, 2016 Nuclide Analysis Results of the Underground Bypass (Investigation Holes/Pumping Well) and the Sea Side Observation Holes (As of June 9)
June 10, 2016 Underground Reservoir Tritium Analysis Results (As of June 8)
June 10, 2016 Underground Reservoir Observation Holes Nuclide Analysis Results(As of June 9)
June 10, 2016 Underground Reservoir Nuclide Analysis Results (As of June 9)
June 9, 2016 Underground Reservoir Nuclide Analysis Results (As of June 8)
June 9, 2016 Underground Reservoir Observation Holes Nuclide Analysis Results(As of June 8)
June 8, 2016 Tritium Analysis Results of the Underground Bypass (Investigation Holes/Pumping Well) and the Sea Side Observation Holes (As of June 6)
June 8, 2016 Underground Reservoir Nuclide Analysis Results (As of June 7)
June 8, 2016 Underground Reservoir Observation Holes Nuclide Analysis Results(As of June 7)
June 7, 2016 Nuclide Analysis Results of the Underground Bypass (Investigation Holes/Pumping Well) and the Sea Side Observation Holes (As of June 6)
June 7, 2016 Underground Reservoir Nuclide Analysis Results (As of June 6)
June 7, 2016 Underground Reservoir Observation Holes Nuclide Analysis Results(As of June 6)
June 6, 2016 Underground Reservoir Nuclide Analysis Results (As of June 5)
June 6, 2016 Underground Reservoir Observation Holes Nuclide Analysis Results(As of June 5)
June 5, 2016 Underground Reservoir Nuclide Analysis Results (As of June 4)
June 5, 2016 Underground Reservoir Observation Holes Nuclide Analysis Results(As of June 4)
June 4, 2016 Tritium Analysis Results of the Underground Bypass (Investigation Holes/Pumping Well) and the Sea Side Observation Holes (As of June 2)
June 4, 2016 Underground Reservoir Tritium Analysis Results (As of June 2)
June 4, 2016 Underground Reservoir Nuclide Analysis Results (As of June 3)
June 4, 2016 Underground Reservoir Observation Holes Nuclide Analysis Results(As of June 3)
June 3, 2016 Nuclide Analysis Results of the Underground Bypass (Investigation Holes/Pumping Well) and the Sea Side Observation Holes (As of June 2)
June 3, 2016 Underground Reservoir Tritium Analysis Results (As of June 1)
June 3, 2016 Underground Reservoir Nuclide Analysis Results (As of June 2)
June 3, 2016 Underground Reservoir Observation Holes Nuclide Analysis Results(As of June 2)
June 2, 2016 Underground Reservoir Observation Holes Nuclide Analysis Results(As of June 1)
June 2, 2016 Underground Reservoir Nuclide Analysis Results (As of June 1)
June 1, 2016 Tritium Analysis Results of the Underground Bypass (Investigation Holes/Pumping Well) and the Sea Side Observation Holes(As of May 30)
June 1, 2016 Underground Reservoir Nuclide Analysis Results (As of May 31)
June 1, 2016 Underground Reservoir Observation Holes Nuclide Analysis Results(As of May 31)

Definite Report of Analysis Results

The analysis results of the major 3 nuclides (I-131, Cs-134, Cs-137) are updated daily as a prompt report above.
Here, the reevaluation of the major 3 nuclides and analysis results of other γ nuclides are posted as a definite report.

English form

June 22, 2016 Definite Results of Nuclides Analysis at Fukushima Daiichi Nuclear Power Station (Announced on May 16 - 31, 2016)
June 8, 2016 Definite Results of Nuclides Analysis at Fukushima Daiichi Nuclear Power Station (Announced on May 1 - 15, 2016)

Daily Analysis Results on Radioactive Material at Fukushima Daiichi Nuclear Power Station(Japanese site)

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