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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.

Prompt Report of Analysis Results (July, 2015)

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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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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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
-
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.

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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July 31, 2015 Underground Reservoir Tritium Analysis Results (As of July 24)
July 31, 2015 Underground Reservoir Nuclide Analysis Results (As of July 30)
July 30, 2015 Underground Reservoir Nuclide Analysis Results (As of July 29)
July 29, 2015 Underground Reservoir Observation Holes Nuclide Analysis Results (As of July 28)
July 28, 2015 Tritium Analysis Results of the Underground Bypass (Investigation Holes/Pumping Well) and the Sea Side Observation Holes (As of July 20)
July 28, 2015 Nuclide Analysis Results of the Underground Bypass (Investigation Holes/Pumping Well) and the Sea Side Observation Holes (As of July 27)
July 25, 2015 Underground Reservoir Nuclide Analysis Results (As of July 24)
July 24, 2015 Underground Reservoir Tritium Analysis Results (As of July 17)
July 24, 2015 Underground Reservoir Nuclide Analysis Results (As of July 23)
July 23, 2015 Underground Reservoir Nuclide Analysis Results (As of July 22)
July 22, 2015 Underground Reservoir Observation Holes Nuclide Analysis Results (As of July 21)
July 21, 2015 Tritium Analysis Results of the Underground Bypass (Investigation Holes/Pumping Well) and the Sea Side Observation Holes (As of July 13)
July 21, 2015 Nuclide Analysis Results of the Underground Bypass (Investigation Holes/Pumping Well) and the Sea Side Observation Holes (As of July 20)
July 18, 2015 Underground Reservoir Nuclide Analysis Results (As of July 17)
July 17, 2015 Underground Reservoir Tritium Analysis Results (As of July 10)
July 17, 2015 Underground Reservoir Nuclide Analysis Results (As of July 16)
July 16, 2015 Underground Reservoir Nuclide Analysis Results (As of July 15)
July 15, 2015 Underground Reservoir Observation Holes Nuclide Analysis Results (As of July 14)
July 14, 2015 Tritium Analysis Results of the Underground Bypass (Investigation Holes/Pumping Well) and the Sea Side Observation Holes (As of July 6)
July 14, 2015 Nuclide Analysis Results of the Underground Bypass (Investigation Holes/Pumping Well) and the Sea Side Observation Holes (As of July 13)
July 11, 2015 Underground Reservoir Nuclide Analysis Results (As of July 10)
July 10, 2015 Underground Reservoir Tritium Analysis Results (As of July 2)
July 10, 2015 Underground Reservoir Nuclide Analysis Results (As of July 9)
July 9, 2015 Underground Reservoir Tritium Analysis Results (As of July 1)
July 9, 2015 Underground Reservoir Nuclide Analysis Results (As of July 8)
July 8, 2015 Underground Reservoir Observation Holes Nuclide Analysis Results (As of July 7)
July 7, 2015 Tritium Analysis Results of the Underground Bypass (Investigation Holes/Pumping Well) and the Sea Side Observation Holes (As of June 29)
July 7, 2015 Nuclide Analysis Results of the Underground Bypass (Investigation Holes/Pumping Well) and the Sea Side Observation Holes (As of July 6)
July 4, 2015 Underground Reservoir Nuclide Analysis Results (As of July 3)
July 3, 2015 Underground Reservoir Nuclide Analysis Results (As of July 2)
July 2, 2015 Underground Reservoir Nuclide Analysis Results (As of July 1)

Other

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July 29, 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)
July 27, 2015 Analysis result of seawater sample:Yotsukura beach, Nakoso beach in Fukushima Prefecture
July 23, 2015 Seawater collected in offshore area of Ibaraki Prefecture
July 21, 2015 Analysis result of seawater sample:Yotsukura beach, Nakoso beach in Fukushima Prefecture
July 15, 2015 Seawater collected in offshore area of Miyagi Prefecture
July 14, 2015 in the soil
July 13, 2015 Analysis result of seawater sample:Yotsukura beach, Nakoso beach in Fukushima Prefecture
July 10, 2015 in the ocean soil off the coast (Dry Soil Rate : June 2015)
July 7, 2015 Seawater collected in offshore area of Miyagi Prefecture
July 3, 2015 in the soil
July 1, 2015 in the ocean soil off the coast (Dry Soil Rate : May 2015)

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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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July 24, 2015 Definite Results of Nuclides Analysis at Fukushima Daiichi Nuclear Power Station (Announced on June 16 - 30, 2015)
July 8, 2015 Definite Results of Nuclides Analysis at Fukushima Daiichi Nuclear Power Station (Announced on June 1 - 15, 2015)

Analysis Results at Water Treatment Facility

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July 22, 2015 Nuclide analysis results of water at water treatment facility

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


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