More Radiation Hotspots Found at Fukushima NPP
The operator of Japan’s nuked Fukushima plant has found two new radiation hotspots near storage tanks holding highly irradiated water, raising fear of new leaks as the extent of the disaster widens.
The news follows a press release earlier this week in which Tokyo Electric Power Co (TEPCO), a name now synonymous with incompetence, treachery and cowardice, admitted contaminated water with dangerously high levels of radiation was leaking from one of its purpose-built storage tanks.
The first of the two highly irradiated areas was found near the tank No. 4 in the group B in the H3 area, with a reading of 100mSv/h, and the second was near storage tank No. 10 in the group A in the H3 area, where the reading was 70mSv/h.
The company’s latest press release is posted below.
Press Releases 2013
Press Release (Aug 22,2013) – Water Leak at a Tank in the H4 area in Fukushima Daiichi Nuclear Power Station (Follow-up Information 10)
This is follow-up information on the “water leak at a tank in the H4 area in Fukushima Daiichi Nuclear Power Station” found on August 19.
From around 11:00 AM to around 3:00 PM, we conducted full inspections (appearance inspections and dose measurement) on the flanged tanks in the other areas, which are of the same type as the tank from which water has leaked.
Neither leak nor puddle was found by the appearance inspections on the tanks and the drain valves. However, 2 locations locally showing high dose rates were found around the H3 area tanks.
The surfaces of these locations were dry, and we confirmed that water flowed out neither into the inside of the dike nor into the outside of the dike. We also confirmed that the water levels of these tanks remain unchanged after receiving water.
[High dose rate locations, the surface dose equivalent rates at these locations (γ and β rays (70μm dose equivalent rate)), and tank water levels]
” Near the bottom flange of the tank No. 4 in the group B in the H3 area: 100mSv/h and approx. 97% of the full water level
” Near the bottom flange of the tank No. 10 in the group A in the H3 area: 70mSv/h and approx. 95% of the full water level
No locations around the other tanks and drain valves showed high dose rates.
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What is a lethal dose of radiation from a single Exposure?
Studies of the 1945 atomic bombing at Hiroshima and Nagasaki show that 100 percent of victims whose bodies were exposed to 600,000 millirems (6,000 mSv) died from radiation. About 50 percent of victims who received 450,000 millirems (4,500 mSv) of radiation also died.
(Note: Rem is a unit of ionizing radiation equal to the amount that produces the same damage to humans as one roentgen of high-voltage x-rays. Source: MIT)
1 rem = 10 mSv (1 Sv = 100 rem)
Background Radiation in millirems per year (mrem/yr)
- Average background radiation (US): 300
- Higher altitudes (e.g, Denver): 400
“Safe Levels” of Radiation (U.S.)
Limits above natural background radiation levels (average 300 millirems per year) and medical radiation:
- Occupation Limit: Maximum of 5,000 (the limit for a worker using radiation)
- Average Natural Background: 300
[Note: Lifetime cumulative exposure should be limited to a person's age multiplied by 1,000 millirems, e.g., a 70-year-old person, 70,000 millirems.]
- Max single dose for an adult: 3,000
- Annual total dose: 5,000
- Max single dose for a person aged under 18 years: 300 millirems (whole body equivalent)
- Annual total exposure: 500
- Maximum limit for fetal exposure during gestation period: 50 millirems per month above background levels
- Single Chest X-ray (the whole body equivalent): 2 millirem
- Coast-to-coast US round trip flight: 12 millirems
*Note: Radiation dose of about 2,000 millisieverts (200,000 millirems) cause serious illness.
Half-life of some radioactive elements
[NOTE: Half-life is the time taken for a radioactive substance to decay by half.]
- Cesium-134 ~ 2 years
- Cesium-137 ~ 30 years
- Iodine-131 ~ 8 days
- Plutonium-239 ~ 24,200 years
- Ruthenium-103 ~ 39 days [Ruthenium is a fission product of uranium-235.]
- Ruthenium-106 ~ 374 days
- Strontium-90 ~ 28.85 years [Strontium-90 is a product of nuclear fission and is found in large amounts in spent nuclear fuel and in radioactive waste from nuclear reactors.]
- Uranium-234 ~ 246,000 years
- Uranium-235 ~ 703.8 million years
- Uranium-238 ~ 4.468 billion years
The following probability figures calculated by FIRE-EARTH on April 8, 2011 still hold!
- Japan (880)³
- United States (865)
- France (855)
- Taiwan (850)
- Belgium, China, Finland, India, South Korea, United Kingdom, Ukraine, Russia, Slovakia, Czech Republic, Armenia, Slovenia, Croatia, Romania, Hungary, Bulgaria, Spain, Pakistan, Argentina, Brazil, Mexico, South Africa, Canada (810)
- Germany, Sweden, Netherlands (800)
- Switzerland (750)
- The list represents a snapshot of events at the time of calculating the probabilities. Any forecast posted here is subject to numerous variable factors.
- Figures in the bracket represent the probability of an incident occurring out of 1,000; the forecast duration is valid for the next 50 months.
- Probability includes a significant worsening of Fukushima nuclear disaster, and future quakes forecast for Japan.
- A nuclear incident is defined as a level 5 (Accident With Wider Consequences), or worse, on the International Nuclear and Radiological Event Scale (INES). See below.
- Safety issues considered in compiling these lists include the age, number of units and capacity of nuclear reactors in each country/state, previous incidents, probability of damage from human-enhanced natural disasters, e.g., earthquakes, tsunamis, volcanic activity, hurricanes, tornadoes, storms, wildfires, flooding…]
- The Blog’s knowledge concerning the extent to which the factors described in (3) might worsen during the forecast period greatly influences the forecast. (Last UPDATED: June 26, 2011)
- Disaster Deepens at “Nuked” Fukushima Plant August 21, 2013
- Fukushima SNAFU August 20, 2013
- Radioactive Water at Fukushima an ‘Emergency’: Watchdog August 5, 2013
- Nuke Disasters
- Japan Quakes
- Probability of a Nuclear Disaster by Country
- Record High Radiation Found in Fukushima Fish March 1, 2013
- Radiation Record Broken by Fukushima Fish March 18, 2013
- Fukushima Pre-Harvested Rice Contaminated by Radiation September 24, 2011\
- Japan’s Nuclear Industry: Mega Disaster in the Making June 11, 2011
- Japan Earthquakes, Disasters: Recent History and FIRE-EARTH Forecasts
Also search the blog for dozens of additional entries on “Fukushima.”