Monday, 2 March 2015

Map of the various facilities around the plant complex at Fukushima Daiichi.

TEPCO has released a detailed map of the various facilities around the plant complex at Fukushima Daiichi. The map is helpful for locating facilities in relation to each other or identifying what something seen in a photo might be. The map below can be clicked on to open a larger version in a new browser tab. There is also an extensive list of the latitude & longitude coordinates for facilities and canals around the plant listed below the map on this page. This can be useful when using Google Earth to identify what is at a location.

Fukushima Daiichi Nuclear Power Station facilities location index
Sources used:
TEPCO Fukushima Daiichi Nuclear Power Station Site Layout (map)
Appendix 2 – January 29, 2015
The measurements and comments are based on comparing that map with a Google Earth image that had been captured on 3/23/2014.
Location listings
Unit #1 – 37.422963°, 141.033312°
Unit #2 – 37.422186°, 141.033218°
Unit #3 – 37.421034°, 141.033190°
Unit #4 – 37.419864°, 141.033178°
Unit #5 – 37.429528°, 141.032775°
Unit #6 – 37.428475°, 141.032822°
Units 1 & 2 Main transformers building – 37.422846°, 144.030452°
Units 3 & 4 Main transformers building – 37.420556°, 141.031489°
Units 5 & 6 Main transformers building – 37.429556°, 144.030921°
Chiller for reactor water injection facility
37.425692°, 141.031663°
Common pool
37.419616°, 141.031339°
Fresh water tanks
37.415000°, 141.031868° Note: It appears that there are two covered pool tanks.
Dry cask temporary storage facility
37.425503°, 141.026137° Note: On 3/23/2014, there appeared to be 50 cask blocks on the pad. Elevation: Approximately 40 m AMSL.
Second cesium absorption apparatus (HTI Building)
37.418800°, 141.031555°
Cesium absorption apparatus (Incineration Workshop Building)
37.418798°, 141.032376°
Decontamination instruments (Process Building)
37.418201°, 141.032734°
Cesium absorption vessel temporary storage
37.417786°, 141.031511°
37.417864°, 141.032248°
Temporary waste sludge storage
37.416316°, 141.031372° Note: This pad contain three buildings.
High-level accumulated water reception tank (emergency reception)
37.415622°, 141.031752° Note: Large tank has white sloped sides and brown roof.
Miscellaneous Solid Waste Volume Reduction Treatment Building (Installation underway)
37.431247°, 141.030783° Note: This is a large high building that constitutes a major construction project.
Multi-nuclide removal equipment
37.424467°, 141.024693° Note: A large white building is at this location along with four tanks and two lower units. The site indicator block is not sized properly.
High-performance multi-nuclide removal equipment
37.424580°, 141.027416° Note: On 3/23/2014, there were two building at this location with a lot of ground clearing going on around them. These structures appeared to have no connections to other facilities.
Additional multi-nuclide removal equipment
37.424467°, 141.026500° Note: On 3/23/2014, there was only land clearing going on in this area.
RO concentrated water treatment facility
37.425649°, 141.024752° Note: On 3/23/2014, this site only involved the construction of large structure there.
Sub-drain-purification system (planned)
37.425255°, 141.024577° Note: On 3/23/2014, this site only involved the construction of large structure there.
Secondary waste from water treatment
Spent absorption vessel temporary storage
37.414792°, 141.030554° Note: This area includes two long storage pads with rail mounted gantry cranes. On 3/23/2014, the middle pad was filled and the east one was about 80% filled. In total they were about 90% filled.
Spent absorption vessel temporary storage
37.243184°, 141.027057° Note: This is the location of the vessel storage pad with a red, rail mounted gantry crane. It doesn’t appear that something else is planned for this site. Some vessels appear to be stored on the north edge, close to the road.
37.420980°, 141.024579° Note: This contains an array of nine horizontal tanks and two large vertical tanks. The north end of the pad contains other items.
Spent absorption vessel temporary storage (multi-nuclide removal equipment, etc.)
37.415505°, 141.0029915° Note: This storage pad involves the northern-quarter of a long storage pad containing a rail mounted gantry crane. On 3/23/2014, the pad was about 80% full.
37.414604°, 141.029911° Note: On 3/23/2014, about 10% of the lower-three quarters of this rail mounted gantry crane pad was occupied. At the southern end was a collection of fans.
Mid-/ low-level contaminated water
B (Tank Group)
37.417387°, 141.029937° – 15 tanks
37.416924°, 141.029723° – 5 tanks
Water desalinations (RO)
37.417162°, 141.028264° Note: This pad contains over 100 reverse osmosis (RO) cartridges, which will become radioactively contaminated over time.
37.417821°, 141.027703°
Water desalinations (evaporative concentration)
37.417989°, 141.028369°
37.417292°, 141.027134° – 8-tanks
37.416907°, 141.027833° – 5-tanks
37.416534°, 141.028371° – 2-tanks
37.420939°, 141.025314° Note: This appears to be a former parking lot that is used to store a large array of brown containers that likely contain solid materials.
37.419729°, 141.024847° Note: Contains 49 tall gray tanks.
G3 – G4 – G5
37.413456°, 141.030765° Note: This tank farm contains the following groupings. Forty blue, 24 blue, 17 gray, 17 gray and 6 gray tanks.
37.415022°, 141.029303° Note: On 3/23/2014, this contained an array of 20 gray tanks in a north group and 19 gray tanks in a southern group.
37.414063°, 141.029364° Note: On 3/23/2014, this contained two square pads and a smaller rectangular pad on the south side. They appeared to be covered.
H1 (tank array)
37.421786°, 141.025875° Note: This is an array of 12 tanks.
37.421839°, 141.024386° Note: This is an array of 170 horizontal tanks, in three groups. They are 80, 60 and 30 respectively. This array was present on 3/23/2014, but is shown as planned on the facility location map, released later.
37.420068°, 141.027215° Note: Contains 29 tall gray tanks.
37.420943° 141.026080° Note: This plot contains two large buildings with blue roofs.
37.419530°, 141.028146° Note: This plot contains an array of 36 large tanks and 20 smaller tanks.
37.418489°, 141.026226° Note: This tank farm consist of 31 tanks.
37.418155°, 141.027237° Note: This tank farm consist of 24 tanks.
37.420007°, 141.023756° Note: This tank farm contains 16 tall blue tanks.
37.421122°, 141.023840° Note: These tanks are in two groups. Seven are on the west side and five on the east side.
37.415671°, 141.028244° Note: This contains three pads with tank farms. On 3/23/2014, the bottom pad had 21 tanks with two more under construction. The middle pad had 27 tanks with five more under construction. The upper pad had 3 tanks with two more under construction. It appears to be capable of holding about 34 tanks.
37.416507°, 141.026569° Note: On 3/23/2014, this entire area was being prepared for installing the pads for additional tanks. The area can accommodate approximately 60 tanks like the ones to the SE. Apparently, the northern half of this was to be developed first.
37.416937°, 141.024945° Note: On 3/23/2014, this entire area was being prepared for installing the pads for additional tanks. The area can accommodate approximately 50 tanks like the ones to the SE. Apparently, the northern half of this was to be developed first.
37.416991°, 141.024218° Note: On 3/23/2014, this entire area was being prepared for installing the pads for additional tanks. The area can accommodate approximately 50 tanks like the ones to the SE. Apparently, the eastern 60% of this was to be developed first.
37.417583°, 141.024447 Note: On 3/23/2014, this entire area was being prepared for installing the pads for additional tanks. The area can accommodate approximately 40 tanks like the ones to the SE.
37.418040°, 141.025119° On 3/23/2014, this entire area was a parking lot. The area can accommodate approximately 50 tanks like the ones to the SE. Apparently, the eastern 40% was to be developed first.
J7 (planned)
37.417752°, 141.023098 Note: On 3/23/2014, this entire area primarily contained trees. It had not undergone development. The area can accommodate approximately 40 tanks like the ones to the SE.
K1 (planned)
37.425377°, 141.023980° Note: On 3/23/2014, no tank was visible here.
K1 (planned)
37.424604°, 141.023946° Note: On 3/23/2014, no tank was visible here.
37.424611°, 141.023670° Note: A lengthy building appears at this location. The map marker block appears to be placed a bit too far north of the center of the building.
Underground reservoirs (Mid-/ low-level contaminated water)
37.422485°, 141.024723° Note: There are three reservoirs in this area covered by gray roofs.
37.422572°, 141.023907° – (i)
37.422470°, 141.024792° – (ii)
37.422439°, 141.025539° – (iii)
37.421587°, 141.027663° – (iv)
37.418673°, 114.027424° – (v)
37.418997°, 114.026709° – (vi)
37.418451°, 114.026896° – (vii)
Rubble storage area
37.436551°, 141.032092° Note: A drainage ditch runs N-S along the east side. Two storage cells appear to be completed on the west side. A northeast cell appears to be under construction. It appears to have a rebar covering and that may be followed with concrete and perhaps soil. It appears that a fourth cell has yet to be created.
37.436250°, 141.030294° Note: There are two white-roofed buildings here.
37.434922°, 141.030719° Note: This contains 11 uncovered storage cells. Some of the cells appear to contain white bags. Two of the cells on the west side appear to contain fan housings. What appears to be two large pump motors appears at 37.435060°, 141.030476°.
37.433548°, 141.030801° Note: Two tent building are present with other rubble on their south side that is covered under white tarps. Other materials are on the east side of the buildings.
37.433408°, 141.032866° Note: In this earlier satellite view this area was not cleared for rubble storage.
37.431957°, 141.031735° Note: Rubble is on both sides of the road under white tarps.
37.431172°, 141.032127° Note: The site looks partly developed with a pad but there is little evidence of ‘rubble.’
37.432073°, 141.030236° Note: Various sizes of waste boxes are stacked on this pad. Some materials, on the southern downslope, appears to be quite old.
37.427032°, 141.028218° Note: This involves six buildings.
37.426568°, 141.032654° Note: This contains two large buildings.
37.425907°, 141.032477° Note: This appears to be a storage yard for damaged and contaminated, small to medium sized, vehicles.
37.425305°, 141.032141° Note: On 3/23/2014, this pad was empty.
37.424725°, 141.032206° Note: This area contains a large stack of white waste boxes.
37.422074°, 141.029303° Note: A couple of fans are visible in the rubble pile on the right. A collection of waste containers are on the south side.
37.414065°, 141.031962° Note: On 3/23/2014, there was little visual evidence of rubble at this plot. Just to the east of it there are a lot of large stored mobile machinery that might be contaminated.
37.416523°, 141.029561° Note: On 3/23/2014, earth, or clay fill was being applied to this area. To the E-SE of it was another plot that contained rubble and white waste boxes.
37.417062°, 141.029959° Note: This pad is filled with rubble, on 3/23/2014, that isn’t marked on the later map.
37.418496°, 141.029561° Note: This pad is filled with rubble, on 3/23/2014, that isn’t marked on the later map.
Rubble storage area (planned)
37.436250°, 141.030294° Note: White waste containers appear to be stacked here. No building covers them.
37.426912°, 141.026461° Note: This area may be destined to be cleared out of existing trash. It contains a couple of buildings at its north end.
37.418876°, 141.029446° Note: On 3/23/2014, this area appeared to be well cleared of rubble. Some seemed to be present NE of the block shown on the map.
Trimmed Trees area
37.434871°, 141.024315° Trimmed trees. Note: Log storage.
37.432482°, 141.025596° Trimmed trees. Note: Log storage. It appears a chipper is at this site. At the north-east corner of it are two silver tanks. Those may hold a chemical needed to digest the wood chips when they are in the storage pools.
37.428301°, 141.025639°
37.423020°, 141.029271° Note: On 3/23/2014, there appeared to be large piles of forest debris. There is little evidence of logs, as at other sites.
Trimmed trees area (Temporary trimmed trees storage pool)
37.438667°, 141.033529° Note: This contains seven cells. All appear to be completed with a white cloth covering.
37.437143°, 141.033770° Note: This contains 16 cells. Five appear completed with white cloth covering. The rest appear to have rainwater at the bottoms. Some have one, or more, slanted sides.
37,421791°, 141.026564° Note: There is no visual evidence of ’Temporary’ trimmed tree storage pools here, or of any tree debris on 3/23/2014.
37.419322°, 141.029383° Note: There is no visual evidence that such pools have existed here.
37.412376°, 141.032232° Note: There are 23 storage pools in this array with ten of them being covered on 3/23/2014.
Vehicles maintenance site
37.427195°, 141.023948° Note: On 3/23/2014, it may not have been performing this function. A western portion appeared to contain bins holding various materials.
Vehicle screening and decontamination site
37.422653°, 141.021851°
Groundwater bypass temporary storage tank
37.420990°, 141.026952° Note: This contains 20 tall tanks.
Temporary Administration Office Building
37.420400°, 141.020400° Note: On 3/23/2014, the foundation for a large building was being constructed here.
Administration Office Building (planned)
37.418571°, 141.020617° Note: On 3/23/2014, there were three buildings at the lower portion of this block.
Large rest house (Under construction)
37.418959°, 141.021922° Note: On 3/23/2014 the former parking lot was being cleared to begin construction of the large building. The temporary rest house was indicated as being just attached to the west wall of it.
Access control facility
37.418565°, 141.021565 Note: This appears to consist of at least three large structures.
Main Anti-Earthquake
37.424896°, 141.029757° Note: Poor label (Function-?).
Upper portion of Drainage channel C
37.422374°, 141.020156°
Upper portion of Drainage channel B
37.425121°, 141.021249°
Confluence of Drainage channel B and C
Drainage channel B
37.418489°, 141.028846° – (Flow is south)
Drainage channel C
37.418624°, 141.028985° – (Flow is east-southeast)
37.418276°, 141.029350° – (Flow is east-southeast)
Side gutter drainage radiation monitor (For Drainage channel C)
37.425121°, 141.021249°
Outlet of Drainage channel C (Rerouted on 21 November 2014)
37.420184°, 141.035355°
Assumed source of radionuclides that entered Drainage channel K
37.422102°, 141.032325° (Roof)
Outlets of Drainage channel K
37.417556°, 141.033815° (South end [To sea])
37.425863°, 141.034607° (North end [To open port])
Drainage channel A
37.426150°, 141.030072° (Flow is east)
End of listing.

“Radioactive cover-up” at Fukushima — Experts believe “other sources of contamination” are flowing into ocean

March 1, 2015
Asahi Shimbun, Feb 28, 2015 (emphasis added): The nation’s nuclear watchdog body slammed [TEPCO] over its failure to disclose information on the leakage of radioactive rainwater into the sea… TEPCO President Naomi Hirose… apologized profusely… TEPCO became aware more than a year ago that the concentration of radioactive materials in the water flowing… was high [first disclosing it to regulators] January 2014… TEPCO continued to conceal details, including the fact that the concentration became high whenever it rained… However, TEPCO had decided long ago there was no need to monitor rainwater for radioactive materials.

NHK transcript, Feb 27, 2015 : Experts and local government officials visited the Fukushima Daiichi nuclear plant to examine sources of contaminated water flowing into the seaExperts urged the operator to investigate whether rooftops of other reactor buildings are also sources of tainted water.

Yomiuri Shimbun, Feb 26, 2015: NRA chief slams TEPCO for data reporting delay… after rainwater contaminated with high-level radioactive materials leaked… into the sea… TEPCO reported in January last year that the radioactivity concentration in that trench was higher… TEPCO at last announced… high-level radioactivity [in water] on the rooftop of the No. 2 reactor building… might be one of the sources of contamination… The Economy, Trade and Industry Ministry… pointed out the likelihood of there being other sources of contamination… The Fisheries Agency on Wednesday conducted an emergency hearing with TEPCO officials… and told the utility firm to take measures to minimize damage impacting marine products… “We urge TEPCO to make details clear.”

Japan Times, Feb 26, 2015: [Tepco] admitted Thursday that its latest problem with radioactive water has shattered the trust it was building in Fukushima… and that the decommissioning of the Fukushima No. 1 plant might be delayed [after] the surge in radiation detected in the water draining into the sea… The utility said the source of the contamination is the roof of the No. 2 reactor building, which… remains heavily contaminated.

Naohiro Masuda, head of Tepco’s unit in charge of scrapping Fukushima Daiichi: “The trust of the people in Fukushima is the most important thing… we have damaged that trust… Due to the damaged trust, all of the schedules for the decommissioning tasks could be delayed.”

Arirang, Feb 26, 2015: Tokyo under fire for alleged cover-up of radioactive water — [TEPCO] is under heavy fire for staying silent over a radioactive leak… flowing into the Pacific Ocean.

Source: Enenews

Wednesday, 25 February 2015

Fisheries ‘shocked’ at silence over water leak at wrecked Fukushima No. 1 plant

Fishermen in Fukushima Prefecture slammed Tokyo Electric Power Co. on Wednesday after it emerged that water containing cesium and other radioactive isotopes has been draining into the Pacific near the Fukushima No. 1 plant and that Tepco did nothing to prevent it despite learning of the leak last May.

“I don’t understand why (Tepco) kept silent even though they knew about it. Fishery operators are absolutely shocked,” Masakazu Yabuki, chief of the Iwaki fisheries cooperative, said at a meeting with Tepco officials.

Local fishermen have already given Tepco approval to dump groundwater into the ocean before it becomes tainted, to reduce the volume of water stored in tanks at the site. The operator is now doing this, pumping water from wells, monitoring it and piping it into the ocean.

The latest incident threatens to delay a second round of approval that Tepco wants the fishermen to provide.

The utility admitted Tuesday it failed to disclose leaks of rainwater containing radioactive substances from a drainage ditch at the stricken plant even though it was aware of high radiation in the water last spring.

The ditch receives runoff from the roof of the No. 2 reactor building, which is highly contaminated with radioactive substances such as cesium.

Tepco has said it recorded 29,400 becquerels of radioactive cesium per liter in water pooled on the rooftop.

The water also contained 52,000 becquerels of beta-ray-emitting radioactive substances such as strontium-90. It also detected some 1,050 becquerels of radioactive cesium and 1,500 becquerels of beta ray-emitting radioactive materials per liter near an outlet leading to the sea.

Tepco said there is no major change in the concentration of radioactive substances in seawater it sampled about 1 km from the drainage outlet.

Meanwhile on Sunday, Tepco reported water contaminated with high levels of radiation was flowing into the ocean at the plant’s port through another drainage ditch.

Yuji Moriyama, a Tepco spokesman said the utility did not disclose the information because there is no evidence of environmental impact.

“We were aware that the levels of radioactive materials around the drainage ditch were higher than other places,” Moriyama said, adding that they have been investigating the sources of contamination since last spring.

Source: Japan Times

Fukushima cleanup fails to convince as just 10 to 20% of evacuees seek return

February 25, 2015

Less than one-fifth of evacuees from the Fukushima nuclear disaster say they want to return to their homes, despite government efforts to speed up reconstruction in areas with lower radiation levels.

The finding came from a survey by the Reconstruction Agency conducted between August and October last year that covered about 7,100 evacuee households in Namie; 2,400 in Futaba; 4,000 in Okuma; and 5,600 in Tomioka.

Between 51 percent and 60 percent of the households responded to the poll, including those living outside Fukushima Prefecture.

The four towns, all situated near the crippled Fukushima No. 1 nuclear power plant, are divided into three zones based on annual radiation dosage levels: “difficult-to-return zones” with 50 millisieverts or more; “no-residence zones” between 20 and 50 millisieverts; and “zones being prepared for lifting of evacuation order,” with 20 millisieverts or less.

The central government has placed priority on decontaminating and reconstructing infrastructure in the latter zones to enable residents to return to their homes.

However, the survey showed that just 19.4 percent of evacuee households from “zones being prepared for lifting of evacuation order” in Namie wanted to return, while 14.7 percent of those in the zones in Tomioka felt the same.

Among evacuees from no-residence zones, 16.6 percent of households from Namie and 11.1 percent from Tomioka said they plan to return home when they are allowed.

Among those evacuated from difficult-to-return zones, 17.5 percent of households from Namie and 11.8 percent from Tomioka said they hope to resettle in their homes some day.

About 80 percent of all households in Namie and 70 percent of those in Tomioka are from no-residence zones and "zones being prepared for lifting of evacuation order."

Still, even if the government lifts the evacuation order for these areas, only a handful of evacuees are likely to return, which would crimp revitalization plans for the towns.

Meanwhile, 32.4 percent of households evacuated from no-residence zones in Okuma, which cohosts the crippled plant with Futaba, said they want to return home.

The higher figure reflects preferential construction by the central government and town office of key facilities to promote the town's reconstruction, spurring hope among residents to return.

Decontamination work and restoration of a local highway route are also nearing an end in Okuma.
However, just 3 percent of Okuma residents are from no-residence zones, while the rest are from difficult-to-return zones.

Source: Asahi Shimbun

Tepco covered-up an ongoing leak into the sea since last year April 2014

 February 24, 2015

Tepco admits that it failed to disclose a leak since last year April 2014.
Unit 2′s roof and downspouts have been draining directly out to sea since the disaster. Water found on unit 2′s roofs was highly radioactive with 52,000 bq/liter on one roof

TEPCO did attempt to manage this by throwing down bags of zeolite at the downspout entrance and again at the drainage canal exits. Plans submitted to IRID for a drainage canal filter system called for a much more sophisticated system that would have forced any water leaving these drainage canals through a series of filters.

Zeolite bags were also placed around the entrance to the downspouts on the building roofs. Radiation readings in the downspout water was significantly lower than the water on the roof. A filter that forces all outgoing water through the filter media would have at least worked to more effectively filter water.

Source: Tepco

German Language Reports on continuing Contamination

German News organizations are also reporting on the continuing contamination reported in entry More Water Woes Tainted water leaking into sea from roof of Fukushima plant.

This is an international issue; German Reports confirm TEPCO "tepid" and slow in resolving leaks of highly radioactive water from the roof of the plant:
Alarm after the release of Radioactive Water:
Fukushima aktuell: Alarm nach Austritt von radioaktivem Wasser: [] by Jens Prol
Report notes TEPCO has known of problem since last April
Fukushima aktuell: Radioaktives Wasser sorgt weiterhin für Probleme: [] by Jens Prol
These reports tell that the
a; the Fukushima plant is still releasing highly radioactive contaminants into the ocean. and
b; the authorities at Fukushima are making a pretense of fixing problems.

More Water Woes Tainted water leaking into sea from roof of Fukushima plant

The operator of the tsunami-crippled Fukushima nuclear power plant said on Tuesday it had found a pool of highly contaminated water on the roof of a plant building and that it had probably leaked into the sea through a gutter when it rained.
The finding comes four years after a massive earthquake and tsunami caused meltdowns at Tokyo Electric Power Co Inc’s Fukushima reactors, and 1-1/2 years after Prime Minister Shinzo Abe assured the International Olympic Committee that radiation leaks at the plant were “under control”.
TEPCO said it has been aware since last spring that radiation levels in water running in one of the plant gutters rise when it rains but had confirmed the source of the contamination only on Tuesday.
[end snip]
more JT:

Sunday, 22 February 2015

7,230,000 Bq/m3 of all β nuclide leaked from drain to the sea / “Contamination level suddenly jumped up”

On 2/22/2015, Tepco announced the radiation level suddenly jumped up in the plant area drain to let it flow to the sea.
According to Tepco, 2 radiation monitors detected the rapid increase of all β nuclide density (to include Strontium-90) around 10:00AM.
The indicated radiation level was 5,050,000 〜 5,630,000 Bq/m3.
It made Tepco check the potential leakage of the contaminated water tanks upstream and contaminated water transferring system, but they did not shut down the drain outlet for nearly 3 hours for some reason.
Extremely high level of all β nuclide was detected from seawater near the outlet, which was 3,000,000 Bq/m3. The contaminated water flowed to the sea.

The highest density detected by the monitor was 7,230,000 Bq/m3, which was 10 〜 100 times much as usual.

After all, Tepco found no leakage from contaminated water related facility upstream. There is a possibility that highly contaminated groundwater moved and flowed to the drain.
Currently they are collecting the water from drain by vacuum truck.

Source: Fukushima Diary

Strontium-90 levels spike alarmingly at Fukushima No. 1 plant

The Nuclear Regulation Authority said Sunday that an alarm went off at the Fukushima No. 1 nuclear plant signaling high radioactivity levels in drainage ditches.

According to the NRA and plant operator Tokyo Electric Power Co., the first alarm sounded at around 10 a.m., and another alarm 10 minutes later indicated much higher levels. Officials said contaminated water may have been discharged into the ditches.

The levels of beta ray-emitting substances, such as strontium-90, measured 5,050 to 7,230 becquerels per liter of water between 10:20 a.m. and 10:50 a.m. Tepco requires radioactivity levels of groundwater at the plant discharged into the sea to remain below 5 becquerels.

Since the drainage ditches are connected to the port of the No. 1 plant, the NRA has instructed Tepco to shut the gates there, officials said.

Tepco confirmed that no leaks from tanks containing radioactive water were found, but said it was investing further.

Source: Japan Times

Fukushima radioactive contamination sets off alarm


The operator of the Fukushima Daiichi nuclear power plant says it has detected high levels of radioactive substances in a drainage channel on the plant's premises on Sunday. The Tokyo Electric Power Company is investigating the cause.

TEPCO says the plant's alarm system went off around 10 AM. It showed a rise in radioactivity in the channel that leads to a nearby port.

Measurements showed that levels of beta-ray emitting substances, which are not detected under normal circumstances, had risen to up to 7,230 Becquerels per liter.

The figure is 10 times higher than when rain causes the level to rise temporarily.

The utility suspects that contaminated water in the channel may have leaked into the port.

It has suspended all operations to transfer contaminated water and closed a gate of the channel by the port.

The drainage channel used to be connected to a section of coast beyond the port. TEPCO rerouted it after a series of leaks in 2013.

The company says the water level in a tank that contains contaminated water remains unchanged, showing no signs of leakage, and drain valves that keep water from leaking near the tanks remain closed.

The utility is investigating the cause of the rise of radioactivity in the channel.
Source: NHK