PURPOSE:To improve shielding performance and to reduce the weight and cost of the shielding body by segmenting the inside of a cladding pipe to plural parts axially by partition plates. CONSTITUTION:Neutron shielding materials 2 are packed into the cladding pipe 5 and both ends are hermetically sealed by end plugs 4. The inside of the cladding pipe 5 is segmented axially to the plural parts by the partition plates 3. The generation of nonuniform densities in the powdery shielding materials 2 during use is obviated in this way by planar sintered bodies and the density differences corresponding to the required shielding performance can be provided between the respective partitioned blocks. The weight and cost of the shielding body is thus reduced. The reduced weight and improved economy of not only the single shielding body but the reactor system as well are obtd. by using the shielding body which is provided with the density distribution in the axial direction to optimize the shielding performance.
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