| 摘要 |
PURPOSE: To obtain an adjustable control rod comprising a member for coupling upper and lower supporting members and holding tubular cladding members as an integral structure by composing at least a part of the tubular cladding member of hafnium. CONSTITUTION: Upper and lower supporting members 14, 16 are coupled through coupling members 18 crossed in the center of a control rod. Only a hafnium cladding tube 30 encapsulating boron carbide 32 is arranged in the planar side plate of the control rod. The hafnium cladding tube 30 extends to the fringe 40 of the planar side plate of a central coupling member 18 while being protected by a sheath 43. The hafnium contained in the control rod captures neutron preferentially. This structure realizes an adjustable control rod.
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