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For example, the Westinghouse AP 1000 reactor places cooling water at a level above the reactor unlike the Fukushima design so that it would naturally flow down.
WSJ: Nuclear Industry Likely to Reassess Safety Systems
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In one of the examples cited in the report, the Nuclear Regulatory Commission (NRC) has twice raised the acceptable level of radiation damage reactor vessels can sustain, after several plants violated or came close to violating the original standard.
FORBES: The Biggest Threat to Nuclear Power: 'Pencil Engineering'
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Tepco had been pumping water to raise the level in the No. 2 reactor.
WSJ: Japan's Nuclear Crisis Escalates
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In late March, Tepco said readings of airborne radiation inside the containment vessel at the No. 2 reactor had surged to a deadly 79 sieverts, the highest level since the crisis began March 11 last year.
WSJ: New Leak at Japan Reactor Threatens Ocean
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Meanwhile, engineers are continuing to pump some 11, 500 tonnes of low-level radioactive seawater into the sea so the more highly contaminated water from reactor No 2 can be stored in waste buildings.
BBC: Japan quake: Nitrogen pumped into nuclear reactor
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Following an explosion at reactor No. 2 in Fukushima Tuesday morning, radiation levels at the plant briefly spiked to the highest level recorded yet: 40 rem a level that could cause acute sickness.
FORBES: Japan Radiation Fears May Outstrip The Real Health Dangers
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Because the Fukushima reactor has been flooded and is not on fire, there is currently no threat of it rising to the level of the Chernobyl disaster.
FORBES: Reports Claim Meltdown At Japanese Reactor
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Even after radiation levels in the Fukushima main control room had spiked to 1, 000 times normal levels, radioactive steam had been vented into the environment, and hydrogen explosions had demolished large parts of two reactor buildings, sending radioactive debris a thousand feet into the air, NISA only raised the threat assessment to level 5 the same as the far less catastrophic accident at Three Mile Island.
FORBES: Fukushima and Chernobyl, similar but different