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AREVA Perspectives on the Containment Sump Design and Downstream Effects for U.S. EPR TM Design Fariba Gartland Project

AREVA Perspectives on the Containment Sump Design and Downstream Effects for U.S. EPR TM Design Fariba Gartland Project Manager AREVA NP Inc. NRC Regulatory Information Conference Rockville, MD March 12, 2009. EPR is a trademark of the AREVA Group. Introduction.

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AREVA Perspectives on the Containment Sump Design and Downstream Effects for U.S. EPR TM Design Fariba Gartland Project

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  1. AREVA Perspectives on the Containment Sump Design and Downstream Effects for U.S. EPRTM Design Fariba Gartland Project Manager AREVA NP Inc. NRC Regulatory Information Conference Rockville, MD March 12, 2009 EPR is a trademark of the AREVA Group

  2. Introduction • Innovative and comprehensive solution to the concerns of GSI-191 • Defense-in-depth strategy • Supporting test program • Inspections, tests, analyses and acceptance criteria (ITAAC) Olkiluoto-3 EPR Project, Finland January 2009

  3. US EPRTM ECCS Sump Blockage Mitigation Design Features Design Detail

  4. Defense-in-Depth Strategy • Insulation material • Four protective weir / trash rack structures • Four retaining baskets in the IRWST • Large area, low flow velocity region within the IRWST • Four large surface area three-dimensional flat screen sump strainers in the IRWST

  5. Additional Features • Also contributing to the overall effectiveness of the system: • Retaining basket overlaps trash rack portal area • Overflow from retaining baskets to IRWST • Retaining basket screen mesh size is identical to the strainer screen mesh size • Inverted side screens on the sump suction strainers Retaining Basket Strainer

  6. IRWST Cut-away View ECCS Strainer Retaining Basket Retaining Basket ECCS Strainer Trash Rack

  7. Testing ECCS strainer testing demonstrates effectiveness of three-tiered design • ECCS Strainer Testing • Test facility • Scaling: 1:1 vertical and 1:20 for all other parameters (horizontal, flow rate, screen size, debris amount) • Test results • Three-tiered design very effective • Retaining baskets retained 95% of total debris

  8. Downstream Effects Debris types and design features minimize potential for blockage • Potential blockage minimized by: • The retaining basket and sump strainer screens are the same mesh size, 0.08 x 0.08 inches • High debris retention in the baskets (95%) • Fuel: • U.S. EPR design uses very little fibrous insulation • Evaluations of fuel under expected debris load will be completed according to current industry standards • Components: • Downstream components (e.g., ECCS pumps) will be specified to accommodate expected debris load

  9. ITAAC ITAAC provide confirmation that installation of key components meets the design bases • Pre-operational inspections on key design features affecting sump screen performance: • Trash racks over floor openings • Weir at floor and wall openings • Retaining baskets below floor openings • IRWST suction strainer

  10. Conclusion GSI-191 concerns addressed through defense-in-depth strategy • The potential debris source term is minimized. • The U.S. EPR sump design has advanced and redundant features with respect to post-accident debris accumulation and ECCS recirculation sump strainer blockage.

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