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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.

Prompt Report of Analysis Results (April, 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

English form

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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)NEW

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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.
(Starting operation from April 1, 2015)

Subdrain Water

Subdrain Water near the Turbine Buildings

English form

Sun Mon Tue Wed Thu Fri Sat
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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

English form

Sun Mon Tue Wed Thu Fri Sat
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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
-
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.

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

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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.

English form

April 30, 2015 Underground Reservoir Tritium Analysis Results (As of April 22)
April 30, 2015 Underground Reservoir Nuclide Analysis Results (As of April 29)
April 29, 2015 Tritium Analysis Results of the Underground Bypass (Investigation Holes/Pumping Well) and the Sea Side Observation Holes (As of April 20 and 21)
April 29, 2015 Nuclide Analysis Results of the Underground Reservoir/Underground Bypass and the Sea Side Observation Holes (As of April 28)
April 28, 2015 Nuclide Analysis Results of the Underground Reservoir/Underground Bypass and the Sea Side Observation Holes (As of April 27)
April 27, 2015 Underground Reservoir Nuclide Analysis Results (As of April 26)
April 26, 2015 Underground Reservoir Nuclide Analysis Results (As of April 25)
April 25, 2015 Underground Reservoir Nuclide Analysis Results (As of April 24)
April 24, 2015 Nuclide Analysis Results of the Underground Reservoir/Underground Reservoir Observation Holes (As of April 23)
April 23, 2015 Underground Reservoir Tritium Analysis Results (As of April 15)
April 23, 2015 Underground Reservoir Nuclide Analysis Results (As of April 22)
April 22, 2015 Tritium Analysis Results of the Underground Bypass (Investigation Holes/Pumping Well) and the Sea Side Observation Holes (As of April 13 and 14)
April 22, 2015 Nuclide Analysis Results of the Underground Reservoir/Underground Bypass and the Sea Side Observation Holes (As of April 21)
April 21, 2015 Nuclide Analysis Results of the Underground Reservoir/Underground Bypass and the Sea Side Observation Holes (As of April 20)
April 20, 2015 Underground Reservoir Nuclide Analysis Results (As of April 19)
April 19, 2015 Underground Reservoir Nuclide Analysis Results (As of April 18)
April 18, 2015 Underground Reservoir Nuclide Analysis Results (As of April 17)
April 17, 2015 Nuclide Analysis Results of the Underground Reservoir/Underground Reservoir Observation Holes (As of April 16)
April 16, 2015 Underground Reservoir Tritium Analysis Results (As of April 8)
April 16, 2015 Underground Reservoir Nuclide Analysis Results (As of April 15)
April 15, 2015 Tritium Analysis Results of the Underground Bypass (Investigation Holes/Pumping Well) and the Sea Side Observation Holes (As of April 6 and 7)
April 15, 2015 Nuclide Analysis Results of the Underground Reservoir/Underground Bypass and the Sea Side Observation Holes (As of April 14)
April 14, 2015 Nuclide Analysis Results of the Underground Reservoir/Underground Bypass and the Sea Side Observation Holes (As of April 13)
April 13, 2015 Underground Reservoir Nuclide Analysis Results (As of April 12)
April 12, 2015 Underground Reservoir Nuclide Analysis Results (As of April 11)
April 11, 2015 Underground Reservoir Nuclide Analysis Results (As of April 10)
April 10, 2015 Nuclide Analysis Results of the Underground Reservoir/Underground Reservoir Observation Holes (As of April 9)
April 9, 2015 Underground Reservoir Tritium Analysis Results (As of April 1)
April 9, 2015 Underground Reservoir Nuclide Analysis Results (As of April 8)
April 8, 2015 Tritium Analysis Results of the Underground Bypass (Investigation Holes/Pumping Well) and the Sea Side Observation Holes (As of March 30 and 31)
April 8, 2015 Nuclide Analysis Results of the Underground Reservoir/Underground Bypass and the Sea Side Observation Holes (As of April 7)
April 7, 2015 Nuclide Analysis Results of the Underground Reservoir/Underground Bypass and the Sea Side Observation Holes (As of April 6)
April 6, 2015 Underground Reservoir Nuclide Analysis Results (As of April 5)
April 5, 2015 Underground Reservoir Nuclide Analysis Results (As of April 4)
April 4, 2015 Underground Reservoir Nuclide Analysis Results (As of April 3)
April 3, 2015 Nuclide Analysis Results of the Underground Reservoir/Underground Reservoir Observation Holes (As of April 2)
April 2, 2015 Underground Reservoir Tritium Analysis Results (As of March 25)
April 2, 2015 Underground Reservoir Nuclide Analysis Results (As of April 1)
April 1, 2015 Tritium Analysis Results of the Underground Bypass (Investigation Holes/Pumping Well) and the Sea Side Observation Holes (As of March 23 and 24)
April 1, 2015 Nuclide Analysis Results of the Underground Reservoir/Underground Bypass and the Sea Side Observation Holes (As of March 31)

Other

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April 29, 2015 Nuclides Analysis Result of Unit 1 discharge channel at Fukushima Daiichi NPS
April 28, 2015 in the ocean soil off the coast
April 26, 2015 Nuclides Analysis Result of Unit 1 discharge channel at Fukushima Daiichi NPS
April 24, 2015 Nuclides Analysis Result of Unit 1 discharge channel at Fukushima Daiichi NPSSeawater collected in offshore area of Miyagi Prefecturein the ocean soil off the coast (Dry Soil Rate : March 2015)
April 22, 2015 Nuclides Analysis Result of Unit 1 discharge channel at Fukushima Daiichi NPSNuclide 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)
April 21, 2015 Seawater collected in offshore area of Ibaraki and Miyagi Prefecture
April 19, 2015 Nuclides Analysis Result of Unit 1 discharge channel at Fukushima Daiichi NPS
April 17, 2015 Nuclides Analysis Result of Unit 1 discharge channel at Fukushima Daiichi NPS
April 15, 2015 Nuclides Analysis Result of Unit 1 discharge channel at Fukushima Daiichi NPSSeawater collected in offshore area of Miyagi Prefecture
April 12, 2015 Nuclides Analysis Result of Unit 1 discharge channel at Fukushima Daiichi NPS
April 10, 2015 Nuclides Analysis Result of Unit 1 discharge channel at Fukushima Daiichi NPS
April 8, 2015 Nuclides Analysis Result of Unit 1 discharge channel at Fukushima Daiichi NPS
April 5, 2015 Nuclides Analysis Result of Unit 1 discharge channel at Fukushima Daiichi NPS
April 3, 2015 Nuclides Analysis Result of Unit 1 discharge channel at Fukushima Daiichi NPS
April 1, 2015 Nuclides Analysis Result of Unit 1 discharge channel at Fukushima Daiichi NPS

English form

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

April 28, 2015 Definite Results of Nuclides Analysis at Fukushima Daiichi Nuclear Power Station (Announced on March 16 - 31, 2015)
April 7, 2015 Definite Results of Nuclides Analysis at Fukushima Daiichi Nuclear Power Station (Announced on March 1 - 15, 2015)

Analysis Results at Water Treatment Facility

English form

April 17, 2015 Nuclide analysis results of water at water treatment facility

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