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Fukushima Core Debris Removal - Preparations and Phases for Removal of Fuel Debris

This update discusses the preparations and phases involved in the removal of fuel debris from the Fukushima Daiichi Nuclear Power Plant. It highlights the timeline for different phases and the goals to achieve stable conditions. It also emphasizes the importance of staff training, motivation, and worker safety. The update includes key factors, pathways, and techniques for successful debris removal and decontamination.

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Fukushima Core Debris Removal - Preparations and Phases for Removal of Fuel Debris

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  1. Update on Fukushima Daiichi NPP 1 – Preparations for Core Debris Removal Robert Kury Vice President, Nuclear Liabilities D&D Program Management 1 March 2013 Presented to Colorado State University Health Physics Graduates

  2. Fukushima Core Debris Removal

  3. Fukushima Core Debris Removal

  4. Fukushima Core Debris Removal BWR Mark I Containment

  5. Phases of Mid-to-Long Term Roadmap Present (completion of step 2) Within 2 years Within 10 years After 30-40 years Phase 1 Phase 2 Phase 3 Step 1, 2 Period to the start of fuel removal from spent fuel pool (Within 2 years) Period to the start of fuel debris removal (Within 10 years) Period to the end of decommissioning (After30-40 years) <Achieved Stable Conditions> -Condition equivalent to cold shutdown-Significant suppression of emissions -Commence the removal of fuels from the spent fuel pools (Unit 4 in 2 years)-Reduce the radiation impact due to additional emissions from the whole site and radioactive waste generated after the accident (secondary waste materials via water processing and debris etc.). Thus maintain an effective radiation dose of less than 1 mSv/yr at the site boundaries caused by the aforementioned. -Maintain stable reactor cooling and accumulated water processing and improve their credibility. -Commence R&D and decontamination towards the removal of fuel debris-Commence R&D of radioactive waste processing and disposal -Complete the fuel removal from the spent fuel pools at all units-Complete preparations for the removal of fuel debris such as decontaminating the insides of the buildings, restoring the PCVs and filling the PCVs with water. Then commence the removal of fuel debris (Target: within 10 years) -Continue stable reactor cooling -Complete the processing of accumulated water -Continue R&D on radioactive waste processing and disposal, and commence R&D on the reactor facilities decommission -Complete the fuel debris removal (in 20-50 years) -Complete the decommissioning (in 30-40 years) -Implement radioactive waste processing and disposal Actions towards systematic staff training and allocation, improving motivation, and securing worker safety will be continuously implemented 5

  6. Fukushima Core Debris Removal

  7. Fukushima Core Debris Removal

  8. Fukushima Core Debris Removal

  9. Fukushima Core Debris Removal

  10. Fukushima Core Debris Removal

  11. Fukushima Core Debris Removal

  12. Summary of Pathways Evaluated Dose Rates in mSv/hr 12

  13. Keys to Success – Elimination and Shielding of High Radiation Sources 13

  14. Fukushima Core Debris Removal

  15. Fukushima Core Debris Removal

  16. Fukushima Core Debris Removal

  17. Fukushima Core Debris Removal

  18. Summary of Pathways Evaluated Dose Rates in mSv/hr 18

  19. Factors Considered for the Pathways 19

  20. Qualitative Comparison Results 20

  21. Keys to Success • Confirmation of Existing Conditions • Elimination of High Rad Sources • Debris Cleanup and Removal • Decontamination Methods • Techniques can be performed remotely, semi-remotely, or manually, depending on habitability 21

  22. Keys to Success – Decontamination Methods Note: Initial survey data show moderate levels of removable Cs-137 contamination, which is not a major contributor to the general area dose rates. Therefore, general decontamination activities should be performed after installation of shielding to reduce dose rate to a target of < 5 mSv/hr. 22

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