| 摘要 |
PROBLEM TO BE SOLVED: To enhance the cooling efficiency of a control rod drive unit, in a nuclear reactor and a cooling structure and method of the control rod drive unit. SOLUTION: The cooling structure of a control rod drive unit comprises a housing 59 containing a magnetic jack and fixed to the upper section of a reactor vessel 41, air suction sections 102 for sucking cooling air into the housing 59, first exhaust ducts 104 circumferentially lined together with the suction sections 102 along the housing 59 for sucking the cooling air in the housing through first suction ports 109 in the lower section and guiding the cooling air upward, second exhaust ducts 105 arranged below the suction section 102 for sucking the cooling air in the housing 59 through second suction ports 110 and guiding the cooling air to the first exhaust ducts 104, and a discharge section 111 provided in the upper section of the housing 59 for discharging the cooling air in the first exhaust ducts 104 to the outside. COPYRIGHT: (C)2009,JPO&INPIT
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