Effects of fuel relocation on reflood in a partially-blocked rod bundle
| Autor: | Kihwan Kim, Jongrok Kim, Byoung Jae Kim, Sung Won Bae, Sang-Ki Moon |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
Nuclear and High Energy Physics
Materials science genetic structures business.industry 020209 energy Mechanical Engineering Drop (liquid) 02 engineering and technology Structural engineering Mechanics 01 natural sciences Ballooning Rod 010305 fluids & plasmas Nuclear Energy and Engineering Bundle 0103 physical sciences Heat transfer 0202 electrical engineering electronic engineering information engineering General Materials Science sense organs Safety Risk Reliability and Quality business Waste Management and Disposal |
| Zdroj: | Nuclear Engineering and Design. 312:239-247 |
| ISSN: | 0029-5493 |
| Popis: | Ballooning of the fuel rods has been an important issue, since it can influence the coolability of the rod bundle in a large-break loss-of-coolant accident (LBLOCA). Numerous past studies have investigated the effect of blockage geometry on the heat transfer in a partially blocked rod bundle. However, they did not consider the occurrence of fuel relocation and the corresponding effect on two-phase heat transfer. Some fragmented fuel particles located above the ballooned region may drop into the enlarged volume of the balloon. Accordingly, the fuel relocation brings in a local power increase in the ballooned region. The present study’s objective is to investigate the effect of the fuel relocation on the reflood under a LBLOCA condition. Toward this end, experiments were performed in a 5 × 5 partially-blocked rod bundle. Two power profiles were tested: one is a typical cosine shape and the other is the modified shape considering the effect of the fuel relocation. For a typical power shape, the peak temperature in the ballooned rods was lower than that in the intact rods. On the other hand, for the modified power shape, the peak temperature in the ballooned rods was higher than that in the intact rods. Numerical simulations were also performed using the MARS code. The tendencies of the peak clad temperatures were well predicted. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect