1/11 Maintenance Scheme for Post-ITER Power Reactors S.NISHIO for Reactor Design Team JAERI ; Naka Fusion Research Establishment Naka-machi, Naka-gun Ibaraki-ken.

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Presentation transcript:

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

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

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

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

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

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

7/11 PF Coils Positioning Plasma Shaping Control (Ellipticity)  95 < ~2.0

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)

Qualitative Comparison of Maintenance Approaches (by L.M.Waganer) 9/11 Maintenance Time Replacement Sector Reliability Building Cost Maintenance Equipment Cost Spare Equipment Cost Waste Volume Contamination Control Applicability to Scheduled and Unscheduled Maintenance Criteria (Importance) In-Situ Maintenance Hot Cell Maintenance 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/

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

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