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Fukushima N uclear D isaster

Fukushima N uclear D isaster. Team 07: Belsheim Joshua Francis Travis He Jiayang Moehling Anthony Ziemkowski Micah. Presentation Outline. Introduction Events Reactions Design Flaws Suggestions. Jiayang 2. How did the disaster happen?. Earthquake Tsunami Equipment failure

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Fukushima N uclear D isaster

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  1. Fukushima Nuclear Disaster Team 07: Belsheim Joshua Francis Travis He Jiayang MoehlingAnthony Ziemkowski Micah

  2. Presentation Outline • Introduction • Events • Reactions • Design Flaws • Suggestions Jiayang 2

  3. How did the disaster happen? • Earthquake • Tsunami • Equipment failure • Nuclear meltdown • Releases of radioactive materials Figure 1. Nuclear Plants in Japan (From Wikipedia) Jiayang 3

  4. Events • Units 1, 2, and 3 exploded • Units 4, 5, and 6 shut down • Central fuel storage was secured • Contamination Figure 2. Fukushima Nuclear Plant

  5. Contamination Zone Figure 3. Contamination zone. http://energy.gov/content/situation-japan

  6. Severity of Disaster • Declared Nuclear Emergency • 7 out 7 on the INES (International Nuclear Event Scale) Figure 4

  7. Reactions • Automatic Shut Down • Evacuated 100,000 people • Started cooling 2 weeks later • Drop to a stable temperate 6 months later • Cold shutdown 9 months later

  8. Design Flaws • RPV: reactor pressure vessel. • DW: dry well enclosing reactor pressure vessel. • WW: wet well - torus-shaped all around the base enclosing steam suppression pool. • SFP: spent fuel pool area. • SCSW: secondary concrete shield wall. Figure 5:Reactor Cross section

  9. Suggestions on Prevention of Future Disasters • Emergency generators for the plant should be placed in areas of little seismic activity and low risk of flooding. • High quality design, material selection, and construction of the plant. • Equipment which prevents operation disturbances and human error. • Monitoring and testing to detect equipment failure. • Redundant safety measures and containment systems. • Ability to confine damage to individual systems, sections, and reactors. Joshua 9

  10. Suggestions For Containment • Lead sarcophagus around the reactors like Chernobyl. • Ice wall around the affected area. Figure 7:Lead Sarcophagus Figure 6: Ice Wall

  11. Conclusion • Reason • Event • Reaction • Design • Suggestion

  12. References Figure 1 and Figure 2 http://en.wikipedia.org/wiki/Fukushima_Daiichi_nuclear_disaster Figure 3 http://energy.gov/content/situation-japan Figure 4 http://www-ns.iaea.org/tech-areas/emergency/ines.asp Figure 6 http://blog.kievukraine.info/uploaded_images/4778-750384.jpg Figure 7 http://news.bbcimg.co.uk/media/images/69623000/gif/_69623952_fukushima_ice_wall_624.gif

  13. Resources http://www.world-nuclear.org/info/Safety-and-Security/Safety-of-Plants/Fukushima-Accident-2011/#.UjY6fj-Dl8E http://www-ns.iaea.org/tech-areas/emergency/ines.asp http://www.reuters.com/article/2011/04/12/japan-severity-idUSTKE00635720110412 http://www.iaea.org/newscenter/news/tsunamiupdate01.html

  14. Question?

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