Effect of water entrainment on the coolability of a debris bed surrounded by a by-pass: Integral reflood experiments and modelling
| Autor: | Nourdine Chikhi, A. Swaidan, Florian Fichot |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
Entrainment (hydrodynamics)
Materials science 020209 energy Front (oceanography) 02 engineering and technology Mechanics 01 natural sciences Debris Lower limit 010305 fluids & plasmas Debris bed Nuclear Energy and Engineering Homogeneous 0103 physical sciences 0202 electrical engineering electronic engineering information engineering Water injection (engine) Quartz |
| Zdroj: | Annals of Nuclear Energy. 110:418-437 |
| ISSN: | 0306-4549 |
| Popis: | To assess the severe accident management strategy, the question of debris coolability has to be resolved. In this framework, large scale debris bed reflood tests have been performed in the PEARL facility. The debris bed, 500 mm in height and 450 mm in diameter, was made of 4 mm stainless steel balls surrounded by a 45 mm-thick bypass filled with 8 mm quartz balls. Bottom-reflood tests have been successfully conducted under pressure (1–2–3–5 bar) with different water injection velocities (2–5–10 m/h) and initial temperatures (150–400–700 °C). For each tests, the bed has been cooled down and the quench front progression was mainly axial from the bottom to the top and homogeneous in most of the experimental bed. The experimental results show that the reflood time tends to a lower limit when the water injection velocity or the pressure is increased. To interpret this result, an analytical model has been developed. It shows that, for high injection velocities (>5 m/h) or low pressure ( |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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