Analysis of the consequences of an airplane crash on an underground radioactive waste storage building
| Autor: | Marin Kostov, Pascal Steiner, Karol Swiderski, Jens-Uwe Klügel, Milko Miloshev, Andrii Nykyforchyn, Behrooz Askari |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Nuclear and High Energy Physics
Kerosene business.product_category Petroleum engineering business.industry Mechanical Engineering Radioactive waste Combustion law.invention Airplane Asphalt concrete Nuclear Energy and Engineering law Asphalt Nuclear power plant Environmental science General Materials Science Safety Risk Reliability and Quality business Waste Management and Disposal Roof |
| Zdroj: | Nuclear Engineering and Design. 352:110149 |
| ISSN: | 0029-5493 |
| Popis: | A hypothetical crash of a military airplane F-4 onto the underground radioactive waste storage building of the Nuclear Power Plant Gosgen was investigated. The main objectives of the study were to evaluate the amount of the kerosene fuel entering the storage building, via the structural damage of the roof, and to seek the potential releases of radioactive materials into the environment caused by a subsequent internal fire. These led to two consecutive studies: FE structural analysis and CFD fire analysis of the storage buildings. The dynamic structural analyses of the impact onto the reinforced concrete roof covered by an asphalt concrete layer were performed using an integral simulation approach. The detailed finite element model of the airplane includes kerosene as Smooth Particle Hydrodynamics (SPH) particles, which allows to evaluate the kerosene dispersion and penetration. The results were compared to those with the rigid fuel model by finite elements. The airplane model was validated by a comparison between the rigid wall impact analysis and the SNL full scale test onto the concrete wall. Finally, sensitivity analyses of the penetrated amount of kerosene on various model parameters including impact location and angle, the material models of concrete, reinforcement, asphalt concrete and the airplane. The analyses showed that the incorporation of the asphalt concrete layer in the structural model has a considerable impact on the roof damage, airplane residual velocity and the kerosene penetration. Moreover, the area of the roof hole was calculated to be used in the subsequent fire analyses. The effective area resulted to be smaller, since it is reduced by the airplane debris stuck. A reference roof hole-size and a reference mass of the kerosene entering the buildings, obtained from earlier structural analysis, were used in the CFD-based fire analysis of the radioactive waste storage buildings. The analysis included also a parametric study covering the effect of the geometric configuration of the stainless steel barrels (containing bituminized radioactive waste), kerosene mass, hole size. The CFD fire simulations preceded by a mesh analysis which led to the choice of a fine mesh in the compartment where the military airplane crash occurred, and coarser meshes elsewhere. These analysis showed that the fire duration and combustion gas temperatures depend strongly on the roof hole size and whether the building doors are closed or left open. In addition, the dynamics of fire was found to be complex, involving turbulent mixing of air, kerosene and combustion gases, chemical reactions, ventilation and buoyancy effects, and pool fire flame expansion. Another important finding was that the mechanical and thermal resistances of the barrels provide further barriers to a possible bitumen and radioactive waste burning, preventing radioactive releases into the environment. Finally the CFD simulation results suggest that the release of radioactive materials is not expected and in some cases is totally excluded. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect