| 摘要 |
PROBLEM TO BE SOLVED: To elevate a cooling water temperature in a reactor core outlet, by bringing cooling water for a fuel assembly into a downflow in a peripheral part of a supercritical water cooled nuclear reactor. SOLUTION: The cooling water of a low temperature flows from a cold leg 3 into a reactor pressure vessel 1. One portion of the cooling water is passed through a downcomer 2 to reach a lower dome 12. The remainder of the cooling water is passed through an upper dome 5, goes down through a control rod cluster guide tube 7, goes down further through the fuel assembly 9 in the peripheral part, and reaches to the lower dome 12. The cooling water joined in the lower dome 12 flows from a core lower part 11 into the fuel assembly 10 in the central part, and heated to be discharged thereafter to a core upper part 8. Two flows of high temperature cooling water discharged from the respective fuel assemblies in the central part are mixed therein to flow toward a turbine through a hot leg 4, after outgoing from the reactor pressure vessel 1. COPYRIGHT: (C)2005,JPO&NCIPI
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