Patent Number: 061378542
Section: claims

1. A reactor control rod, comprising: a wing having a sheath which has a substantially U-shaped cross-section and an opening;  a water feed hole formed in said sheath for introducing core water into said wing;  a top end structure secured to a longitudinal top end of said sheath;  a bottom end structure secured to a longitudinal bottom end of said sheath;  a central structure to which said opening portion of said sheath is secured;  a neutron absorber element made of a neutron absorbing material, said neutron absorber element being charged in said sheath;  a supporting rod through hole formed in said neutron absorber element, so as to penetrate said neutron absorber element;  a supporting rod fitting hole formed in said sheath; and  a load supporting rod inserted into said supporting rod through hole, said load supporting rod having:  wherein a groove is formed on a surface of said main body portion of said load supporting rod substantially parallel to a longitudinal direction of said load supporting rod, so that a core water is passed between said load supporting rod and said neutron absorber element.  said neutron absorber element comprises a pair of neutron absorber plates, said neutron absorber plates being opposed to and spaced from each other by said local spacers, so as to hold a predetermined clearance between said opposing neutron absorber plates,  said local spacer comprises a body portion provided between said opposing neutron absorber plates, so as to hold said predetermined clearance therebetween, and axis portions protruded from both ends of said body portion, so as to be inserted into spacer through holes formed in said neutron absorber plates, wherein top ends of said axis portions are slightly protruded outwardly beyond outer surfaces of said neutron absorber plates, so as to create minute clearances between said sheath and said neutron absorber plates.  a wing having a sheath which has a substantially U-shaped cross-section and an opening;  a water feed hole formed in said sheath for introducing core water into said wing;  a top end structure secured to a longitudinal top end of said sheath;  a bottom end structure secured to a longitudinal bottom end of said sheath;  a central structure to which said opening portion of said sheath is secured;  a neutron absorber element made of a neutron absorbing material, said neutron absorber element being charged in said sheath;  a supporting rod through hole formed in said neutron absorber element, so as to penetrate said neutron absorber element;  a supporting rod fitting hole formed in said sheath;  a load supporting rod inserted into said supporting rod through hole, said load supporting rod having:  a plurality of local spacers,  wherein 2. A reactor control rod according to claim 1, further comprising a plurality of local spacers, wherein 3. A reactor control rod, comprising: