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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

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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 (August, 2015)

The date colored yellow provides the latest data.

Air

Air on the premises of Power Station

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

Seawater

Seawater near Power Station

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CSV

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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

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CSV

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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

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  • *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)

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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

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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

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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
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1500Bq/l
Notification Level Limit (Reference)
60Bq/l
90Bq/l
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30Bq/l
60000Bq/l
WHO Drinking Water Guideline
10Bq/l
10Bq/l
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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

Result of weighted average sample analysis for groundwater bypass at Fukushima Daiichi Nuclear Power Station

*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 Jul 31 (As of June, 2015).

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.

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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.

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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

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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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August 29, 2015 Underground Reservoir Nuclide Analysis Results (As of August 28)
August 28, 2015 Underground Reservoir Tritium Analysis Results (As of August 21)
August 28, 2015 Underground Reservoir Nuclide Analysis Results (As of August 27)
August 27, 2015 Underground Reservoir Nuclide Analysis Results (As of August 26)
August 26, 2015 Underground Reservoir Observation Holes Nuclide Analysis Results (As of August 25)
August 25, 2015 Tritium Analysis Results of the Underground Bypass (Investigation Holes/Pumping Well) and the Sea Side Observation Holes (As of August 17)
August 25, 2015 Nuclide Analysis Results of the Underground Bypass (Investigation Holes/Pumping Well) and the Sea Side Observation Holes (As of August 24)
August 22, 2015 Underground Reservoir Nuclide Analysis Results (As of August 21)
August 21, 2015 Underground Reservoir Tritium Analysis Results (As of August 14)
August 21, 2015 Underground Reservoir Nuclide Analysis Results (As of August 20)
August 20, 2015 Underground Reservoir Nuclide Analysis Results (As of August 19)
August 19, 2015 Underground Reservoir Observation Holes Nuclide Analysis Results (As of August 18)
August 18, 2015 Tritium Analysis Results of the Underground Bypass (Investigation Holes/Pumping Well) and the Sea Side Observation Holes (As of August 10)
August 18, 2015 Nuclide Analysis Results of the Underground Bypass (Investigation Holes/Pumping Well) and the Sea Side Observation Holes (As of August 17)
August 15, 2015 Underground Reservoir Nuclide Analysis Results (As of August 14)
August 14, 2015 Underground Reservoir Tritium Analysis Results (As of August 6)
August 14, 2015 Underground Reservoir Nuclide Analysis Results (As of August 13)
August 13, 2015 Underground Reservoir Tritium Analysis Results (As of August 5)
August 13, 2015 Underground Reservoir Nuclide Analysis Results (As of August 12)
August 12, 2015 Underground Reservoir Observation Holes Nuclide Analysis Results (As of August 11)
August 11, 2015 Tritium Analysis Results of the Underground Bypass (Investigation Holes/Pumping Well) and the Sea Side Observation Holes (As of August 3)
August 11, 2015 Nuclide Analysis Results of the Underground Bypass (Investigation Holes/Pumping Well) and the Sea Side Observation Holes (As of August 10)
August 8, 2015 Underground Reservoir Nuclide Analysis Results (As of August 7)
August 7, 2015 Underground Reservoir Nuclide Analysis Results (As of August 6)
August 6, 2015 Underground Reservoir Nuclide Analysis Results (As of August 5)
August 5, 2015 Underground Reservoir Observation Holes Nuclide Analysis Results (As of August 4)
August 4, 2015 Tritium Analysis Results of the Underground Bypass (Investigation Holes/Pumping Well) and the Sea Side Observation Holes (As of July 27)
August 4, 2015 Nuclide Analysis Results of the Underground Bypass (Investigation Holes/Pumping Well) and the Sea Side Observation Holes (As of August 3)

Other

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August 28, 2015 Seawater collected in offshore area of Miyagi PrefectureNuclides 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)Nuclide Analysis of the Radioactive Materials in the Fallouts obtained inside and outside of Fukushima Daiichi NPS
August 26, 2015 Seawater collected in offshore area of Ibaraki Prefecture
August 21, 2015 Seawater collected in offshore area of Miyagi Prefecture
August 17, 2015 Analysis result of seawater sample:Yotsukura beach, Nakoso beach in Fukushima Prefecture
August 13, 2015 in the ocean soil off the coast
August 12, 2015 in the ocean soil off the coast (Dry Soil Rate : July 2015)
August 11, 2015 in the soilSeawater collected in offshore area of Ibaraki and Miyagi Prefecture
August 10, 2015 Analysis result of seawater sample:Yotsukura beach, Nakoso beach in Fukushima Prefecture
August 5, 2015 Nuclides Analysis Result of the Radioactive Materials in the Air at the Upper Part of Unit 1 Reactor BuildingSeawater collected in offshore area of Miyagi Prefecturein the soil
August 3, 2015 Analysis result of seawater sample:Yotsukura beach, Nakoso beach in Fukushima Prefecture

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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.

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August 19, 2015 Definite Results of Nuclides Analysis at Fukushima Daiichi Nuclear Power Station (Announced on July 16 - 31, 2015)
August 5, 2015 Definite Results of Nuclides Analysis at Fukushima Daiichi Nuclear Power Station (Announced on July 1 - 15, 2015)

Analysis Results at Water Treatment Facility

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August 18, 2015 Nuclide analysis results of water at water treatment facility

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

Archives

* Please click here for the archives from Dec 23, 2011 to Jul 31, 2015.
* Please click here for the archives before Dec 22, 2011.