NEUTRON SHIELDING MATERIAL, METHOD OF MANUFACTURING THE SAME, AND CASK FOR SPENT FUEL
First Claim
1. A neutron shielding material made of boron-adding stainless steel of either austenite-ferrite two-phase stainless steel or ferritic stainless steel,the austenite-ferrite two-phase stainless steel containing, in mass %, B:
- 0.5% to 2.0%, Ni;
3.0 to 10.0%, and Cr;
21.00 to 32.00%,the ferritic stainless steel containing, in mass %, B;
0.5% to 2.0%, Ni;
4.0% or less, and Cr;
11.00 to 32.00%, andthe boron-adding stainless steel being well in ductility and thermal conduction property.
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Accused Products
Abstract
In one embodiment, a neutron shielding material is formed of boron-adding stainless steel of either austenite-ferrite two-phase stainless steel or ferritic stainless steel, the austenite-ferrite two-phase stainless steel containing, in mass %, B: 0.5% to 2.0%, Ni: 3.0 to 10.0%, and Cr: 21.00 to 32.00%, the ferritic stainless steel containing, in mass %, B: 0.5% to 2.0%, Ni: 4.0% or less, and Cr: 11.00 to 32.00%, and the boron-adding stainless steel being well in ductility and thermal conduction property.
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Citations
15 Claims
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1. A neutron shielding material made of boron-adding stainless steel of either austenite-ferrite two-phase stainless steel or ferritic stainless steel,
the austenite-ferrite two-phase stainless steel containing, in mass %, B: - 0.5% to 2.0%, Ni;
3.0 to 10.0%, and Cr;
21.00 to 32.00%,the ferritic stainless steel containing, in mass %, B;
0.5% to 2.0%, Ni;
4.0% or less, and Cr;
11.00 to 32.00%, andthe boron-adding stainless steel being well in ductility and thermal conduction property. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
- 0.5% to 2.0%, Ni;
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9. A method of manufacturing a neutron shielding material, comprising:
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preparing a raw material for forming either austenite-ferrite two-phase stainless steel containing, in mass %, Ni;
3.0 to 10.0% and Cr;
21.00 to 32.00%, or ferritic stainless steel containing, in mass %, Ni;
4.0% or less and Cr;
11.00 to 32.00%; andadding 0.5% to 2.0% in mass % of boron (B) to the raw material to manufacture boron-adding stainless steel being well in ductility and thermal conduction property. - View Dependent Claims (10)
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11. A cask for spent fuel, comprising:
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a cylindrical container; a lattice-shaped basket that is housed in the container and is for housing spent fuel therein; a lid for sealing the container; an outer cylinder covering the entire container; a resin for absorbing neutrons that is housed between the container and the outer cylinder; cooling fins provided in the resin in order to connect the container and the outer cylinder; and the basket being manufactured of a neutron shielding material made of boron-adding stainless steel of austenite-ferrite two-phase stainless steel or ferritic stainless steel, the austenite-ferrite two-phase stainless steel containing, in mass %, B;
0.5% to 2.0%, Ni;
3.0 to 10.0%, and Cr;
21.00 to 32.00%, the ferritic stainless steel containing, in mass %, B;
0.5% to 2.0%, Ni;
4.0% or less, and Cr;
11.00 to 32.00%, and the boron-adding stainless steel being well in ductility and thermal conduction property. - View Dependent Claims (12, 13, 14, 15)
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Specification