Method of manufacturing a radioactive-substance storage member, billet for use in extrusion of the same, and square pipe
AssigneeMitsubishi Heavy Industries, Ltd.
InventorsKatsunari Ohsono, Kazuo Murakami, Yasuhiro Sakaguchi, Toshiro Kobayashi, Toyoaki Yasui
Life of this patent
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Abstract
An aluminum powder is mixed with a neutron absorber powder through cold isostatic press to form a preliminary molding. The preliminary molding is then subjected to sintering under no pressure in vacuum. After sintering, a billet is subjected to induction heating and hot extrusion to form a square pipe.
Claims37
A method of manufacturing a radioactive-substance storage member for use in storage of a radioactive substance, the method comprising:
- mixing an aluminum powder with a neutron absorber powder;
- pressing the mixed powder to form a preliminary molding;
- and
- sintering the preliminary molding under no pressure in vacuum.
A method of manufacturing a radioactive-substance storage member for use in storage of a radioactive substance, the method comprising:
- mixing an aluminum powder with a neutron absorber powder;
- pressing the mixed powder to form a preliminary molding;
- sintering the preliminary molding under no pressure in vacuum to form a billet;
- heating the billet using an induction heating unit;
- and
- extruding the induction-heated billet using dies to form a square pipe or plate which configures a basket for accommodating an aggregate of spent fuel or a rod to be inserted in a guide pipe for spent fuel.
A method of manufacturing a radioactive-substance storage member for use in storage of a radioactive substance, the method comprising:
- mixing an aluminum powder with a neutron absorber powder;
- pressing the mixed powder to form a preliminary molding;
- sintering the preliminary molding under no pressure in vacuum to form a billet;
- and
- extruding the billet using the heat during the sintering to form a square pipe or plate which configures a basket for accommodating an aggregate of spent fuel or a rod to be inserted in a guide pipe for spent fuel.
A method of manufacturing a radioactive-substance storage member for use in storage of a radioactive substance, the method comprising:
- mixing an aluminum powder with a neutron absorber powder;
- pressing the mixed powder to form a preliminary molding;
- and
- sintering the preliminary molding under no pressure in an inert gas ambience.
A method of manufacturing a radioactive-substance storage member for use in storage of a radioactive substance, the method comprising:
- mixing an aluminum powder with a neutron absorber powder;
- pressing the mixed powder to form a preliminary molding;
- sintering the preliminary molding under no pressure in an inert gas ambience to form a billet;
- heating the billet using an induction heating unit;
- and
- extruding the induction-heated billet using dies to form a square pipe or plate which configures a basket for accommodating an aggregate of spent fuel or a rod to be inserted in a guide pipe for spent fuel.
A method of manufacturing a radioactive-substance storage member for use in storage of a radioactive substance, the method comprising:
- mixing an aluminum powder with a neutron absorber powder;
- pressing the mixed powder to form a preliminary molding;
- sintering the preliminary molding under no pressure in an inert gas ambience to form a billet;
- extruding the billet using the heat during the sintering to form a square pipe or plate which configures a basket for accommodating an aggregate of spent fuel or a rod to be inserted in a guide pipe for spent fuel.
A billet for use in extrusion of a radioactive-substance storage member, comprising a mixed powder of an aluminum powder and a neutron absorber powder, the mixed powder molded to have a weight density ranging from 75% to 95% and sintered to fuse each powdery particle to another.
A billet for use in extrusion of a radioactive-substance storage member, comprising a mixed powder of an aluminum powder flattened by mechanical alloying and a pulverized boron or boron-compound folded and dispersed into the aluminum powder, the mixed powder molded to have a weight density ranging from 75% to 95% and sintered to fuse each powdery particle to another.
A billet for use in extrusion of a radioactive-substance storage member, wherein the billet is employed as a structural material of storage or transportation containers for spent nuclear fuel, the aluminum powder containing an additional element such as Zr for imparting high strength.
A square pipe which accommodates an aggregate of spent fuel, wherein the square pipe is formed by mixing an aluminum powder with a neutron absorber powder through cold isostatic press or cold unidirectional press to form a preliminary molding, vacuum sintering the preliminary molding under no pressure to form a billet, and heating the billet using an induction heating unit to extrude the square pipe.
A method of manufacturing a radioactive-substance storage member for use in storage of a radioactive substance, the method comprising:
- mixing an aluminum powder with a neutron absorber powder;
- pressing the mixed powder to form a preliminary molding;
- sintering the preliminary molding with a vacuum hot press to form a billet;
- heating the billet using an induction heating unit;
- and
- extruding the induction-heated billet using dies to form a square pipe or plate which configures a basket for accommodating an aggregate of spent fuel or a rod to be inserted in a guide pipe for spent fuel.
Dependencies are inferred from the claim text.