Title: Fukushima Daiichi Nuclear Power Plant Content: thumb|During the 2011 Fukushima nuclear emergency in Japan, three nuclear reactors were damaged by explosions. Fukushima Daiichi Nuclear Power Plant (also called Fukushima I) is a disabled nuclear power plant in the town of Ōkuma in Fukushima Prefecture, Japan. Fukushima Daiichi was the first nuclear power plant to be built and run only by the Tokyo Electric Power Company (TEPCO). In March 2011 there were nuclear emergencies at the power plant and some other Japanese nuclear facilities, which raised questions about the future of nuclear power.Nuclear Renaissance Threatened as Japan’s Reactor StrugglesBloomberg, published March 2011. Retrieved 2011-03-14. Analysis: Nuclear renaissance could fizzle after Japan quakeReuters, published 2011-03-14. Retrieved 2011-03-14. Japan nuclear woes cast shadow over U.S. energy policy Reuters, published 2011-03-13. Retrieved 2011-03-14.Nuclear winter? Quake casts new shadow on reactorsMarketWatch, published 2011-03-14. Retrieved 2011-03-14. Will China's nuclear nerves fuel a boom in green energy? Channel 4, published 2011-03-17. Retrieved 2011-03-17. Following the Fukushima nuclear disaster, the International Energy Agency halved its estimate of additional nuclear generating capacity to be built by 2035. ==The nuclear reactors== thumb|left|A panning type typical BWR Mark I Containment, as used in units 1 to 5.The nuclear reactors for units 1, 2, and 6 were supplied by General Electric, those for units 3 and 5 by Toshiba, and unit 4 by Hitachi. The architectural design for the General Electric's units was done by Ebasco. All of the building work was done by Kajima. Since September 2010, unit 3 has been fueled by MOX fuel|mixed-oxide (MOX) fuel. Units 1–5 had/have a Mark 1 type (light bulb shaped torus) containment structure, unit 6 has Mark 2 type (over/under) containment structure. Unit 1 is a 439 MW boiling water reactor (BWR3) constructed in July 1967. It started to commercially make electricity on March 26, 1971, and was planned to shutdown in March, 2011. It was damaged during the 2011 Sendai earthquake and tsunami. The reactor had high atomic and earthquake safety levels when it was made, but it is now both old and out of date. No one knew such a bad earthquake could happen in Japan. Unit 1 was designed for a earthquake peak ground acceleration shaking motion of 0.18 g (1.74 m/s2) and a seismic response spectrum based on the 1952 Kern County earthquake. All units were inspected after the 1978 Miyagi earthquake when the seismic ground acceleration was 0.125 g (1.22 m/s2) for 30 seconds, but no damage to the critical parts of the reactor was discovered.  Later, unit 4 at the nearby Fukushima II Nuclear Power Station was also shut down by the safety systems. Now, a source of off-site power is available but the damage level at the plant is bad. ==Proposed long term safety activity== ===Boron=== Officials have thought about putting in or aerial dropping radiation killing boric acid, boronated plastic beads or boron carbide pellets into the spent fuel pools to absorb neutrons. France flew 95 tonnes of boron to Japan on 17 March 2011. Neutron are absorbed by boric acid, which has been injected into the reactor cores, but is unclear if boron was also included with the hose and fire truck water spraying of SFPs. ===A 'Sarcophagus tomb' and liquid metal=== On 18 March, the Reuters news agency reported that Hidehiko Nishiyama, a spokesman of Japan's nuclear agency was asked about burying the reactors in a sand and concrete tomb, said: "That solution is in the back of our minds, but we are focused on cooling the reactors down." After the Chernobyl disaster, the atomic safety workmen used 1,800 metric tonnes of sand and clay cover the plant. This created a problem because they were thermal insulators and trapped heat inside.Chernobyl Accident Appendix 1 World Nuclear Association So first a non-evaporating coolant such as a liquid metal has to be put on it. After it has all cooled off a structure such as the Chernobyl Nuclear Power Plant 'sarcophagus tomb'. ==Implications== The nuclear emergencies at Fukushima Daiichi and other nuclear facilities raised questions about the future of nuclear power. Platts has said that "the crisis at Japan's Fukushima nuclear plants has prompted leading energy-consuming countries to review the safety of their existing reactors and cast doubt on the speed and scale of planned expansions around the world". Following the Fukushima nuclear disaster, the International Energy Agency halved its estimate of additional nuclear generating capacity to be built by 2035.