| 摘要 |
The natural circulation type boiling water reactor comprises a core in which a plurality of fuel assemblies are loaded, and a chimney which is disposed above the core and has a path partition which forms a plurality of vertical lattice paths. A uniform pressure space is formed between the core and the chimney and not disposed the path partition. The two-phase flow including the cooling water and the steam exhausted from the core through the uniform pressure space is supplied to the vertical lattice paths. The two-phase flow ascends in the vertical lattice paths. Thus, the flow distribution for each fuel assembly can be calculated using the pressure difference between the upper end and the lower end of the core can be calculated without the need for the void fraction of the lattice paths.
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