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On 15 March, an explosion was observed at unit 4 RB during site evacuation. A team later returned to the power station to inspect unit 4, but were unable to do so due to the present radiological hazard. [8]: 44 The explosion damaged the fourth-floor rooftop area of Unit 4, creating two large holes in a wall of the reactor building (RB). The ...
At 15:36 JST on 12 March, there was an explosion in the reactor building at Unit 1 that was primarily directed sideways. [47] The side walls of the upper level were blown away, leaving in place only the vertical steel framed gridworks. Despite the damage, the remaining walls were relatively intact compared to later explosions at Units 3 and 4.
A nuclear explosion is an explosion that occurs as a result of the rapid release of energy from a high-speed nuclear reaction.The driving reaction may be nuclear fission or nuclear fusion or a multi-stage cascading combination of the two, though to date all fusion-based weapons have used a fission device to initiate fusion, and a pure fusion weapon remains a hypothetical device.
The force of the second explosion and the ratio of xenon radioisotopes released after the accident led Sergei A. Pakhomov and Yuri V. Dubasov in 2009 to theorize that the second explosion could have been an extremely fast nuclear power transient resulting from core material melting in the absence of its water coolant and moderator.
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The ECCS is designed to rapidly cool the core and make it safe in the event of the maximum fault (the design basis accident) that nuclear regulators and plant engineers could imagine. There are at least two copies of the ECCS built for every reactor. Each division (copy) of the ECCS is capable, by itself, of responding to the design basis accident.