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Maintenance Scheme for Post-ITER Power Reactors

1/11. Maintenance Scheme for Post-ITER Power Reactors. Japan-US Workshop on Fusion Power Plants and Related Advanced Technologies with participation of EU, January 11-13, 2005 at Tokyo, JAPAN. S.NISHIO

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Maintenance Scheme for Post-ITER Power Reactors

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  1. 1/11 Maintenance Scheme for Post-ITER Power Reactors Japan-US Workshop on Fusion Power Plants and Related Advanced Technologies with participation of EU, January 11-13, 2005 at Tokyo, JAPAN S.NISHIO for Reactor Design Team JAERI ; Naka Fusion Research Establishment Naka-machi, Naka-gun Ibaraki-ken 311-0193, JAPAN Nishio@ naka.jaeri.go.jp

  2. 2/11 Maintenance Related Issues A maintenance issue inevitably includes a vacuum boundary topology issue and a PF coils positioning issue. Segmentation of Replaceable Components

  3. 3/11 Vacuum Boundary Topology Supporting System of Power Core Components

  4. 4/11 Small Module ( Ship-in-bottle ) Segmentation for In-Situ Maintenance (1) 4~5 tons

  5. 5/11 Segmentation for In-Situ Maintenance (2) Large Module 40~50 tons Reasonably moderate or Unsatisfactory half measures ?

  6. 6/11 Segmentation for Hot Cell Maintenance Hot Cell Maintenance ~300 tons

  7. 7/11 PF Coils Positioning Plasma Shaping Control (Ellipticity) K95 <~2.0

  8. 8/11 Maintainability vs. Plasma Performance Three Possible Concepts (1) In-Situ Maintenance & Higher Elliptic Plasma (2) Hot Cell Maintenance & Lower Elliptic Plasma (3) Hot Cell Maintenance & Higher Elliptic Plasma (but Replaceable PFCs)

  9. Criteria (Importance) In-Situ Maintenance Hot Cell Maintenance 4 4 2 1 1 3 2 3 20 1 (4) 4 (16) 1 (4) 4 (16) 4 (8) 3 (6) 4 (4) 3 (3) 4 (4) 2 (2) 4 (12) 2 (6) 0 (0) 4 (8) 1 (3) 4 (12) 39/80 69/80 Maintenance Time Replacement Sector Reliability Building Cost Maintenance Equipment Cost Spare Equipment Cost Waste Volume Contamination Control Applicability to Scheduled and Unscheduled Maintenance 9/11 Qualitative Comparison of Maintenance Approaches (by L.M.Waganer)

  10. 18.2 m Simple Vacuum Boundary Simple Maintenance Scheme 10/11 Hot Cell Maintenance Approach Replacement Unit

  11. 11/11 Conclusion What can we do? Go back to the starting point. Try to find a guide into tomorrow by taking lesson from the past.

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