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It can end up in artificial water supply systems, including air conditioning systems, water services and cooling towers.
BBC: Legionnaires' Disease bacteria
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Legionella bacteria can contaminate and grow in other water systems such as cooling towers and evaporative condensers.
BBC: Bacteria discovery closes Launceston hospital
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The failure of diesel generators, which power water pumps that are critical to reactor cooling systems, was a leading cause of the current crisis.
WSJ: Japan Plant Had Troubled History
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While the facility would only operate at full capacity for 12 hours a day, the technology is designed to work without water, which is often used in cooling systems for solar thermal plants and is a precious commodity in Arizona.
FORBES: World's Largest Solar Tower Takes Next Step Forward
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Other major problem areas include the heating and cooling air systems as well as the water heater.
FORBES: Where SolarCity's CEO Failed In Energy Efficiency
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Workers at the Fukushima Daiichi plant are attempting to remove highly radioactive water from a reactor building to allow repair work to the cooling systems knocked out on 11 March.
BBC: Japan bans entry into Fukushima evacuation zone
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Normal cooling systems don't require the massive amounts of water -- around 7 metric tons (1, 850 gallons) per hour -- now being poured into the reactors.
CNN: STORY HIGHLIGHTS
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It uses so-called passive systems for cooling, such as the gravity flow of water and natural circulation based on thermodynamics.
WSJ: NRC Approves Toshiba Reactor Design
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But if cooling systems had not been restored, it is possible that the water in the ponds could have started to boil.
BBC: Power at Fukushima nuclear fuel ponds restored
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It said some of the gas - which is used in the site's cooling systems - may have turned into liquid as the fire service used water to prevent it dispersing.
BBC: Llangefni: Vion food factory ammonia gas leak inquiry
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Some 110, 000 people living around the Fukushima Dai-ichi nuclear plant were evacuated after the massive March 11, 2011 earthquake and tsunami knocked out the plant's power and cooling systems, causing meltdowns in three reactors and spewing radiation into the surrounding air, soil and water.
NPR: WHO: Small Cancer Risk After Fukushima Accident