The document provides a detailed timeline and analysis of the 2011 Fukushima Daiichi nuclear disaster in Japan. It describes how the earthquake and tsunami damaged the plant's reactors, causing explosions and radiation leaks. It outlines the restoration efforts and current status of each reactor, noting concerns over spent fuel pools. While the disaster was severe, the conclusion argues that with improved safety measures, nuclear power remains important for energy needs when in less seismically active areas like India.

1. NUCLEAR CRISIS OF JAPAN
(FUKUSHIMA – A DETAILED ANALYSIS)
Presented by
YATRA…

2. Types of Nuclear reactors
• Pressurized water reactors
• Pressurized heavy water reactors
• Boiling water reactors
• Advanced Boiling Water reactors
• Pool water reactors
• Liquid metal cooled reactors and so on

3. Generation of Nuclear Reactors

4. Fukushima Nuclear Plant
• This Daiichi Nuclear Power Plant is a BWR type located
in the town of Okuma in the Futaba District of Fukushima
Prefecture, Japan, first commissioned in 1971.
• It houses six reactors, all of same type falls under the
Generation II
• These reactors are capable of producing a power of
4.7Gwe.
• Fukushima I is one of the 15 largest nuclear power
stations in the world.
• These reactors used Low Enriched Uranium as fuel.

5. Basic Diagram of a BWR

6. Model of Reactor In Fukushima

7. Timeline of Nuclear disaster
• Friday, 11 March
14:46A 9.0 magnitude earthquake strikes off the coast of Honshu
Island at a depth of about 24 kilometres (15 mi). Fukushima I power
plant's nuclear reactors 1, 2, and 3 are automatically shut down by
the shake. Nuclear reactors 4, 5, and 6 were undergoing routine
maintenance and were not operating, (reactor 4 was defueled Nov
2010). The tremor has the additional effect of causing the power
plant to be cut off from the Japanese electricity grid, however,
backup diesel generators kick in to continue cooling.
• Saturday,12 March
15:36Unit 1 at Fukushima I: cameras document a massive hydrogen
explosion on the outer structure of one of four buildings at the plant.
It also documents the outer structure collapsing. TEPCO 3 hrs later
announces that four persons who are employed at the power plant
have been injured.

8. • Monday, 14 March
11:15The outer building surrounding Unit 3 of Fukushima I explodes
• Tuesday 15 March
06:14 (approximate)A third explosion occurs at Fukushima I, unit 2
and damages the containment building

9. Overview of Reactors

10. Exploded Reactors

11. Commendable Restoration of
Japan Govt.
• Soldiers from Japan's Self Defense Force and Tokyo
firefighters are helping to douse the reactors and fuel-rod
pools, and the "Fukushima Fifty" have been joined by
hundreds of other technicians apparently willing to risk
death to prevent another Chernobyl.
» Continued…………

12. • U.S. Energy Secretary Steven Chu said Sunday that while we have
incomplete information, it appears that "with each passing hour,
each passing day, things are more under control.“
• Tepco has been able to restore electricity at three of the six reactors
• Helicopter drops of seawater "appear to have created a modicum of
stability,“

13. Current status of reactors
• Reactor No. 1
Seawater did more damage to Reactor 1 than previously believed, and the
unit will take longer to repair than expected
• Reactor No. 2
Coolant pumps and electrical components were damaged at Reactor No. 2,
and the earliest those parts can be replaced
• Reactor No. 3
Officials say fuel inside the reactor has been partially exposed as
temperatures rose and water levels dropped. Workers have injected
seawater into the reactor.
A pool containing spent fuel rods is a chief concern. Firefighters continued
dousing the pool with water Tuesday to keep those rods, which contain
radioactive material, cool.
 Continued…………

14. • Reactor No. 4
The reactor does not contain any fuel rods, but the pool that houses the
spent fuel rods is a chief concern. Crews used cement pumps to spray
water on the pool Tuesday to keep the fuel rods cool.
• Reactor No. 5 , 6
Workers created vent holes in the building's roof to avoid a hydrogen
explosion. The cooling system is working and powered by a generator.

15. Harmful radiation spread zone

16. Radiation Comparison

17. Conclusion
• Here we conclude in a point of a engineering student,
Being a second generation power reactor it has
undergone some operation failure… But with just this we cant claim
the nuclear power generation is a dangerous since it is the only
better solution to overcome the power necessity in this machine
world.
In India we have almost all working nuclear
powerstation falling under the catogory of Gen III or III+ with
additional safety measures been employed. Also our seismic zone
falls under the catogory of low possibilities for earthquake with such
magnitude and hence low risk involved.