Experimental investigation of the coolability of blocked hexagonal bundles
| Autor: | A. Vimi, Péter Szabó, Zoltán Hózer, Róbert Farkas, N. Vér, M. Kunstár, I. Trosztel, Imre Nagy |
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| Rok vydání: | 2017 |
| Předmět: |
Nuclear and High Energy Physics
Materials science business.industry 020209 energy Mechanical Engineering 02 engineering and technology Structural engineering Mechanics 01 natural sciences Rod Ballooning 010305 fluids & plasmas Coolant Volumetric flow rate Nuclear Energy and Engineering Bundle 0103 physical sciences 0202 electrical engineering electronic engineering information engineering Water cooling General Materials Science VVER Safety Risk Reliability and Quality business Waste Management and Disposal Cooling down |
| Zdroj: | Nuclear Engineering and Design. 317:51-58 |
| ISSN: | 0029-5493 |
| DOI: | 10.1016/j.nucengdes.2017.03.030 |
| Popis: | The CODEX-COOL experimental series was carried out in order to evaluate the effect of ballooning and pellet relocation in hexagonal bundles on the coolability of fuel rods after a LOCA event. The effects of blockage geometry, coolant flowrate, initial temperature and axial profile were investigated. The experimental results confirmed that a VVER bundle up to 80% blockage rate remains coolable after a LOCA event under design basis conditions. The ballooned section creates some obstacles for the cooling water during reflood of the bundle, but this effect causes only a short delay in the cooling down of the hot fuel rods. The accumulation of fuel pellet debris in the ballooned volume results in a local power peak, which leads to further slowing down of quench front. |
| Databáze: | OpenAIRE |
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