ICONE11-36543 PRELIMINARY INVESTIGATIONS TO DEVELOP AN ENHANCED IN-VESSEL CORE CATCHER DESIGN

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概要

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• An enhanced in-vessel core catcher is being designed and evaluated as part of a joint U.S. -Korean International Nuclear Engineering Research Initiative (INERI) investigating methods to insure in-vessel retention of materials that may relocate under severe accident conditions in advanced reactors. To reduce cost and simplify manufacture and installation, this new core catcher design consists of several interlocking sections that are machined to fit together when inserted into the lower head. For reactor designs with penetrations, the core catcher is manufactured with holes to accommodate lower head penetrations. Each section of the core catcher consists of two material layers with an option to add a third layer (if deemed necessary) : a base material, which has the capability to support and contain the mass of core materials that may relocate during a severe accident; an oxide coating material on top of the base material, which resists interactions with high-temperature core materials; and an optinal coating on the bottom side of the base material to prevent any potential oxidation of the base material during the lifetime of the reactor. Key properties of possible core catcher base and coating materials were reviewed; and a set of candidate materials was identified based on cost, material properties (melting temperature, ultimate strength, thermal conductivity, resistance to thermal shock, coefficients of linear expansion), and the potential for chemical interactions. Scoping thermal and structural analyses were completed to obtain additional insights about the thickness and type of material that should be selected for each layer of the core catcher. Scoping flow analyses were also completed to determine the impact of this core catcher on reactor vessel coolant flow. Last, scoping materials interaction tests were completed to determine if iron oxide forms in the presence of more promising candidate oxide coating materials, the temperature at which such iron oxide forms, and the ability of iron oxide formation to liquefy candidate oxide coatings. Results from these scoping analyses suggest that thermally-sprayed magnesium oxide is the most promising candidate for a core catcher coating. SCDAP/RELAP5-3D^[○!C]thermal analysis results also indicate that the performance of the core catcher is not significantly impacted by the type of steel (SA304 or SA533B1) selected for the base material, the thickness of the base or coating material, or the porosity of the coating material. However, structural analyses results suggest that the core catcher's base material should be at least 2 cm thick to support the loads associated with relocated materials during a severe accident. Last, analyses indicate that the impact of the core catcher on reactor vessel coolant flow is negligible.

• 一般社団法人日本機械学会の論文

著者

• Knudson D.

  Idaho National Engineering And Environmental Laboratory

• Condie K.

  Idaho National Engineering and Environmental Laboratory

• Kim S.

  Korea Atomic Energy Research Institute

• Rempe J.

  Idaho National Engineering and Environmental Laboratory

• Suh K.

  Seoul National University

• Cheung F.

  The Pennsylvania State University

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