Patent Number: 060410914
Section: claims

1. A control rod for a nuclear reactor, comprising: a center structural member; and  a plurality of wings each including  wherein respective lengths in the sheath longitudinal direction of the neutron absorbing elements closer to the front end structural member are smaller than respective lengths in the sheath longitudinal direction of the neutron absorber elements further from the front end structural member, and the neutron absorbing elements are supported to the U-shaped sheath by the load supporting members to thereby reduce a local load applied to the U-shaped sheath.  a center structural member; and  a plurality of wings each including  wherein at least a part of the plurality of load supporting members supporting the neutron absorbing element is arranged in a vicinity of a central portion of the neutron absorbing element, and said neutron absorbing element is composed of a hafnium metal or a long-lived type neutron absorbing plate by forming a hafnium alloy into a plate shape diluted by diluting hafnium with a diluting agent such as zirconium or titanium, and said neutron absorbing element has a trap structure based on a combination of a plurality of said neutron absorber plates with a water gap serving as a reactor water channel, and the load supporting member is provided with means for maintaining a gap between the neutron absorber plates.  a center structural member; and  a plurality of wings each including  wherein said neutron absorbing element includes a hafnium metal formed into a plate shape, said integral type neutron absorbing element has a trap structure based on a combination of a plurality of said neutron absorber plates with a water gap being interposed therebetween, the neutron absorber plate has a thickness gradually reduced from the leading end side of the control rod insertion toward the terminal end side thereof and the load supporting member to be secured to the U-shaped sheath is fitted to an attachment hole with a predetermined margin, two such load supporting members are each provided at an interval in the sheath longitudinal direction, and an interval maintaining member secured to the U-shaped sheath at opposing central portions thereof in a wing width direction and in a sheath longitudinal direction between the load supporting members is mounted to at least one set of the neutron absorbing elements. 2. A control rod for a nuclear reactor, comprising: 3. A control rod for a nuclear reactor, comprising: