| 摘要 |
PROBLEM TO BE SOLVED: To realize a channel structure of a lattice channel, which reduces flow induced vibration of a flow regime of a two-phase (gas-liquid) flow produced, when a plurality of vertical lattice channels are formed by partitions and the inner side of a chimney is used as an ascending channel of a coolant. SOLUTION: A plurality of vertical lattice channels 11a-1, 11a-2 are formed by upper/lower lattice structure members 11-1, 11-2 within the circular tubular chimney 11 installed above a core 7 inside a pressure vessel 6. A branching/confluent zone 37 in which the lattice channels 11a-1, 11a-2 have different channel cross-sections is provided between partition end faces 28, 29 of the upper/lower lattice structure members 11-1, 11-2 to change the flow regime of the two-phase (gas-liquid) flow into a flow regime mixed or combined with a flow regime such as a churn flow when the two-phase (gas-liquid) flow ascends from the lattice flow channel 11a-1 to the lattice flow channel 11a-2 so that flow induced vibration load produced in the flow regime of the churn flow is reduced to secure the structural soundness of the chimney and economy is achieved in performance work for maintaining the soundness and making periodic inspection of the reactor. COPYRIGHT: (C)2007,JPO&INPIT
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