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Specification of Surface Roughness for Hydraulic Flow Test Plates
| 题名： | Specification of Surface Roughness for Hydraulic Flow Test Plates |
| 作者： | Timothy S. Yoder;Donna Post Guillen; |
| 关键词： | boehmite, surface roughness, friction factor36 - MATERIALS SCIENCE; ALUMINIUM; BUILDUP; COOLANTS; CORROSION; CORROSION PRODUCTS; FLOW RATE; FUEL PLATES; HYDRAULICS; MOCKUP; PLATES; REACTOR OPERATION; ROUGHNESS; SPECIFICATIONS; TEST REACTORS; THERMAL HYDRAULICS; TOLERANCE |
| 摘要： | A study was performed to determine the surface roughness of the corrosion layer on aluminum clad booster fuel plates for the proposed Gas Test Loop (GTL) system to be incorporated into the Advanced Test Reactor (ATR) at the Idaho National Laboratory. A layer of boehmite (a crystalline, non-porous gamma-alumina hydrate) is typically pre-formed on the surface of the fuel cladding prior to exposure to reactor operation to prevent the uncontrolled buildup of corrosion product on the surface. A representative sample coupon autoclaved with the ATR driver fuel to produce the boehmite layer was analyzed using optical profilometry to determine the mean surface roughness, a parameter that can have significant impact on the coolant flow past the fuel plates. This information was used to specify the surface finish of mockup fuel plates for a hydraulic flow test model. The purpose of the flow test is to obtain loss coefficients describing the resistance of the coolant flow paths, which are necessary for accurate thermal hydraulic analyses of the water-cooled booster fuel assembly. It is recommended that the surface roughness of the boehmite layer on the fuel cladding be replicated for the flow test. While it is very important to know the order of magnitude of the surface roughness, this value does not need to be matched exactly. Maintaining a reasonable dimensional tolerance for the surface finish on each side of the 12 mockup fuel plates would ensure relative uniformity in the flow among the four coolant channels. Results obtained from thermal hydraulic analyses indicate that 卤15%deviation from a surface finish (i.e., Ra) of 0.53 矛m would have a minimal effect on coolant temperature, coolant flow rate, and fuel temperature. |
| 报告类型： | 科技报告 |
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