| 摘要 |
PROBLEM TO BE SOLVED: To secure a slowing-down power required by a reactor core of a thermal neutron super-critical pressure water cooled reactor without causing decrease in steam temperature at an outlet of a reactor core. SOLUTION: A super-critical pressure water cooled reactor comprises a plurality of fuel assemblies 30 consisting of a water rod 6, a plurality of fuel rods 3 and a channel box 1 surrounding the side faces of them, and super-critical pressure water is used as a moderator and a cooling medium. The cooling medium is made to flow upward outside of the channel box 1 and inside of the channel box 1 to the outside of the water rod 6. A water rod moderator feeding passage 16 for feeing the moderator into the water rod 6 from outside of the channel box 1 is formed at a height corresponding the top of the fuel rod 3, and a moderator discharging hole 13 is formed at the height corresponding to the bottom of the fuel rod 2 in the wall of the water rod 6 to allow the cooling medium in the water rod 6 to flow out of the water rod 6 inside of the channel box 1 to cause a downward flow of the moderator in the water rod 6. COPYRIGHT: (C)2007,JPO&INPIT
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