| 摘要 |
PROBLEM TO BE SOLVED: To ensure a structural integrity of a feed water nozzle by suppressing a temperature fluctuation in an annular flow path between a thermal sleeve and a feed water nozzle even for mixing core water and feed water with a large temperature difference at the feed water nozzle part in an operation method for removing heat by lowering feed water temperature without increasing steam flow generating from a reactor when a reactor core thermal power increases in a reactor power generation system and suppressing the occurrence of high cycle thermal fatigue caused by the temperature fluctuation due to thermal stratification. SOLUTION: The feed water nozzle 13, attached to the reactor pressure vessel 1 of a nuclear power generation system and connected with the feed water system, forms a double tube structure having a thermal sleeve 14 inside the feed water nozzle 13. The relation between the gapδof an annular flow path 16 formed between the outer surface of the thermal sleeve 14 and a feed water nozzle inner surface 13a and the inner diameter Di isδ/D<SB>i</SB>≤0.03. COPYRIGHT: (C)2006,JPO&NCIPI
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