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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.
* During weekends and national holidays, updates will be provided in Japanese only.

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 (November, 2014)

The date colored yellow provides the latest data.

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 near Power Station

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CSV
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
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.

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.

Leaked Water near South Discharge Cannel on Unit 1-4 side

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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).

  • * The sampling location has been changed on November 26, 2012. (Sampling is performed at approx. 1km south of the previous location.)

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 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

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.

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.

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.

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 Oct 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.

November 24, 2014 Underground Reservoir Nuclide Analysis Results (As of November 23)
November 23, 2014 Underground Reservoir Nuclide Analysis Results (As of November 22)
November 22, 2014 Underground Reservoir Nuclide Analysis Results (As of November 21)
November 21, 2014 Nuclide Analysis Results of the Underground Reservoir/Underground Reservoir Observation Holes (As of November 20)
November 20, 2014 Underground Reservoir Tritium Analysis Results (As of November 12)
November 20, 2014 Underground Reservoir Nuclide Analysis Results (As of November 19)
November 19, 2014 Tritium Analysis Results of the Underground Bypass (Investigation Holes/Pumping Well) and the Sea Side Observation Holes (As of November 10 and 11)
November 19, 2014 Underground Reservoir Tritium Analysis Results/Underground Bypass and the Sea Side Observation Holes (As of November 18)
November 18, 2014 Nuclide Analysis Results of the Underground Reservoirs/Underground Bypass and the Sea Side Observation Holes (As of November 17)
November 17, 2014 Underground Reservoir Nuclide Analysis Results (As of November 16)
November 16, 2014 Underground Reservoir Nuclide Analysis Results (As of November 15)
November 15, 2014 Underground Reservoir Nuclide Analysis Results (As of November 14)
November 14, 2014 Nuclide Analysis Results of the Underground Reservoir/Underground Reservoir Observation Holes (As of November 13)
November 13, 2014 Underground Reservoir Tritium Analysis Results (As of November 5)
November 13, 2014 Underground Reservoir Nuclide Analysis Results (As of November 12)
November 12, 2014 Tritium Analysis Results of the Underground Bypass (Investigation Holes/Pumping Well) and the Sea Side Observation Holes (As of November 3 and 4)
November 12, 2014 Nuclide Analysis Results of the Underground Reservoirs/Underground Bypass and the Sea Side Observation Holes (As of November 11)
November 11, 2014 Nuclide Analysis Results of the Underground Reservoirs/Underground Bypass and the Sea Side Observation Holes (As of November 10)
November 10, 2014 Underground Reservoir Nuclide Analysis Results (As of November 9)
November 9, 2014 Underground Reservoir Nuclide Analysis Results (As of November 8)
November 8, 2014 Underground Reservoir Nuclide Analysis Results (As of November 7)
November 7, 2014 Nuclide Analysis Results of the Underground Reservoir/Underground Reservoir Observation Holes (As of November 6)
November 6, 2014 Underground Reservoir Tritium Analysis Results (As of October 29)
November 6, 2014 Underground Reservoir Nuclide Analysis Results (As of November 5)
November 5, 2014 Tritium Analysis Results of the Underground Bypass (Investigation Holes/Pumping Well) and the Sea Side Observation Holes (As of October 27 and 28)
November 5, 2014 Nuclide Analysis Results of the Underground Reservoirs/Underground Bypass and the Sea Side Observation Holes (As of November 4)
November 4, 2014 Nuclide Analysis Results of the Underground Reservoirs/Underground Bypass and the Sea Side Observation Holes (As of November 3)
November 3, 2014 Underground Reservoir Nuclide Analysis Results (As of November 2)
November 2, 2014 Underground Reservoir Nuclide Analysis Results (As of November 1)
November 1, 2014 Underground Reservoir Nuclide Analysis Results (As of October 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.

The newest data is on Oct 24, 2014.

Analysis Results at Water Treatment Facility

November 21, 2014 Nuclide analysis results at water treatment facility

Archives

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