Question

a paragraph on fukushima meltdown Japan ​

Answer 1

Answer:

Fukushima Daiichi Nuclear disaster on March 11th which is happened due to earthquake and following by tsunami at Japan. This Nuclear disaster which release radioactive materials due to nuclear meltdown caused by equipment failures at Fukushima nuclear power plant.

This power plant with six boiling water reactors is designed by General Electrics and maintained by Tokyo Electric Power Company. From this 6 Reactors, Reactor 5 and 6 is under cold shutdown and Reactor 4 had been de-fueled for planned maintenance purpose. Reactor 1,2 and 3 is shutdown automatically immediately after earthquake and emergency Generator system activated automatically to control electronics and coolant system.

However this generator system is failed to continuously operate due to tsunami following earthquake flooded this generator system located at low-lying room and causing power failure for the critical pumps which should function continuously to circulated coolant water through a nuclear reactor for few days to avoid it from melting down after being shutdown. This failures causing reactors overheated due to high radioactive will be produced in first few days of shutdowns.

Carefully observed the industrial process and operation of the Fukushima nuclear plant.

The Fukushima Daiichi Nuclear Plant was run by the Tokyo Electric Power Company and this nuclear plant has six units which called as boiling water reactors.

Before the earthquake when happen at year 2011, The nuclear power plant was running reactors 1, 2 and 3. At that same time reactors 4, 5 and 6 were being shut down for routine inspections. When the earthquake caressed, the reactors 1, 2 and 3 were shut down automatically which system was for safety. After the emergency shutdown, all the operating units maintained normal cooling immediately.

The natural disaster effect the station and need to cut off all the electricity from the Japan’s national electricity grid. In this case, Japan’s national electricity grid just can use diesel generators for the alternating current (AC) power for backup.

The backup AC power which were been used for cooling the no. 1 units 4 nuclear reactors, which have been knocked out by tsunami. This tsunami was flooding most of the generators and electrical switchgear rooms. As for unit 6, an air-cooled diesel at its generator manage to cope up with the tsunami and provided a backup power to cool both units 5 and 6 which allows these units to be free from the fuel damage.

Backup batteries at the plant were designed use for generate direct current (DC) power for eight hours. However, when this caused the control room for units 1 and 2 went fall into darkness due to without emergency lighting, luckily units 3 and 4 still have emergency lightning. This caused happen due to the tsunami flood that was interrupting the flow of both the AC and DC power, began to have problems cooling the reactors. Hence, seawater were used to cool down the reactor cores as the AC was no longer available to provide power for the primary and secondary cooling systems, and the batteries which were used for backup cooling and control systems were also out of service.

At that moment, to prevent the restart of the nuclear chain reaction, neutron-absorbing boron was added to the seawaters for cooling water levels in the reactor cores did not rise up, but remained low for many days which caused the reactors to overheat.

In the emergency moment, they use hydrogen to generate in the containments of unit 1 until unit 3. This large amount of hydrogen is caused by the chemical reaction between the fuel’s zirconium cladding and high-temperature steam. The hydrogen that flow from the containments into the reactor buildings caused large explosions in units 1, 3 and 4. The Japanese safety regulators estimated that each unit need to use around 800 – 1000 kilograms of hydrogen. The hydrogen explosions caused to restore cooling system.

Evaluate the impact of the Fukushima nuclear disaster to the society, ecology, sociology and health.

Explanation:

Answer 2

Answer:

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Explanation:

Fukushima nuclear disaster" redirects here. For the incidents at Fukushima Daini, see Fukushima Daini Nuclear Power Plant.

"2011 Japanese nuclear accidents" redirects here. For other 2011 Japanese nuclear accidents/incidents, see Fukushima Daini Nuclear Power Plant, Onagawa Nuclear Power Plant, Tōkai Nuclear Power Plant, and Rokkasho Reprocessing Plant.

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The Fukushima Daiichi nuclear disaster (福島第一原子力発電所事故, Fukushima Dai-ichi (pronunciation) genshiryoku hatsudensho jiko) was a nuclear accident at the Fukushima Daiichi Nuclear Power Plant in Ōkuma, Fukushima Prefecture. It was the most severe nuclear accident since the 1986 Chernobyl disaster, and the only other disaster to receive the Level 7 event classification of the International Nuclear Event Scale.[8]

Fukushima Daiichi nuclear disasterPart of the 2011 Tōhoku earthquake and tsunami.

The four damaged reactor buildings (from left: Units 4, 3, 2, and 1) on 16 March 2011. Hydrogen-air explosions in Unit 1, 3, and 4 caused structural damage.

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