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fuel channels PDF

272 Pages·2008·4.36 MB·English
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Fuel Performance Meeting April 8-9, 2008 Lynchburg, VA AREVA NP Inc. AREVA NP INC. Fuel Performance Meeting Slides –April 8, 2008 2 Meeting Agenda > Introductions > NRC Notification – Letter Objectives (cid:138) Describe events and current status • Description of occurrence of fuel rod bow at North Anna • Definition of actions taken (cid:138) Provide Apparent Cause Analysis overview • Technical and programmatic causal factors • Extent of condition (cid:138) Provide overview of governing topical (cid:138) Discuss potential problem (difference between occurrence and topical) (cid:138) Action Plan Overview/Status > Preliminary water channel measurements – North Anna 1 > Summary > Q&A AREVA NP INC. Fuel Performance Meeting Slides –April 8, 2008 3 Description of Fuel Rod Bow Occurrence History of Events AREVA NP INC. Fuel Performance Meeting Slides –April 8, 2008 4 Rod Bow > Alters design pitch dimensions, or water channel gap, between adjacent rods within a Advanced Mark-BW fuel assembly array which affects: > Local nuclear power peaking > Local heat transfer to coolant > Consequence (cid:206) local excessive over-heating of fuel rod cladding which may lead to failure AREVA NP INC. Fuel Performance Meeting Slides –April 8, 2008 5 Rod Bow Occurrence AREVA NP INC. Fuel Performance Meeting Slides –April 8, 2008 6 Advanced Mark-BW 3 Leaf Holddown Spring Fuel Assembly Asssembly (Inconel) Top Nozzle Fixed Top End Grid (Inconel) M5TM Guide Thimbles 3 Mid-Span Mixing Grids M5TM 5 Floating Vaned Intermediate Grids M5TM Lower 3 spans observed with elevated rod bow M5TM Fuel Rod Floating Vaneless Cladding Intermediate Grid M5TM Fixed Bottom End Grid (Inconel) Coarse Mesh Debris Filter Seated Fuel Bottom Nozzle Rods AREVA NP INC. Fuel Performance Meeting Slides –April 8, 2008 7 North Anna Unit 2 EOC 18 Fuel Rod Bow AREVA NP INC. Fuel Performance Meeting Slides –April 8, 2008 8 AREVA NP INC. Fuel Performance Meeting Slides –April 8, 2008 9 AREVA NP INC. Fuel Performance Meeting Slides –April 8, 2008 10

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Fuel Performance Meeting Slides – April 8, 2008. AREVA NP INC. 2 . Supplier/Process Change. Mt Athos Road .. Analytical and materials laboratories. > Advanced ANP-10256, Methodology for Analysis of Control Rod. Withdrawal . Large grain size and low resintering of Cr-doped fuel reduces
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