Radiation resistant electric wire and radiation resistant cable

1. A radiation resistant electric wire, comprising:

a conductor;

an inner insulating layer comprising a naphthylene group-containing polymer and having a thickness between 0.1 and 1 mm; and

an outer insulating layer comprising a cross-linked polyolefin,

wherein the conductor is coated with the inner insulating layer and the outer insulating layer therearound.

2. The radiation resistant electric wire according to claim 1 , wherein the naphthylene group-containing polymer comprises polyethylene naphthalate (PEN) or polybutylene naphthalate (PBN).

3. The radiation resistant electric wire according to claim 2 , wherein the cross-linked polyolefin polymer comprises a halogen polymer, a polyethylene, an ethylene vinyl acetate copolymer, an ethylene ethyl acrylate copolymer, an ethylene methyl acrylate copolymer, a natural rubber, an ethylene propylene rubber, an ethylene propylene diene terpolymer, a butyl rubber, or a nitrile rubber.

4. The radiation resistant electric wire according to claim 2 , wherein the cross-linked polyolefin polymer comprises a halogen polymer, and wherein the halogen polymer is one of polychloroprene, chlorosulfonated polyethylene, and chlorinated polyethylene.

5. The radiation resistant electric wire according to claim 2 , wherein the cross-linked polyolefin polymer comprises a polyethylene, wherein the polyethylene is one of an ultralow density polyethylene, a low density polyethylene, a medium density polyethylene, and a high density polyethylene.

6. The radiation resistant electric wire according to claim 1 , wherein the outer insulating layer is the outermost layer of the wire.

7. The radiation resistant electric wire according to claim 1 , wherein the inner insulating layer and the outer insulating layer form a double layered insulation structure.

8. The radiation resistant electric wire according to claim 1 , wherein the outer insulating layer consists essentially of the cross-linked polyolefin.

9. A radiation resistant cable, comprising:

a plurality of electric wires stranded together; and

a sheath, with which a perimeter of the stranded electric wires is covered,

wherein the electric wires comprise a conductor, an inner insulating layer comprising a naphthylene group-containing polymer and having a thickness between 0.1 and 1 mm, and an outer insulating layer comprising a cross-linked polyolefin, and

wherein the conductor is coated with the inner insulating layer and the outer insulating layer therearound.

10. The radiation resistant cable according to claim 9 , wherein the naphthylene group-containing polymer comprises polyethylene naphthalate (PEN) or polybutylene naphthal ate (PBN).

11. The radiation resistant cable according to claim 10 , wherein the cross-linked polyolefin polymer comprises a halogen polymer, a polyethylene, an ethylene vinyl acetate copolymer, an ethylene ethyl acrylate copolymer, an ethylene methyl acrylate copolymer, a natural rubber, an ethylene propylene rubber, an ethylene propylene diene terpolymer, a butyl rubber, or a nitrile rubber.

12. The radiation resistant cable according to claim 10 , wherein the cross-linked polyolefin polymer comprises a halogen polymer, and wherein the halogen polymer is one of polychloroprene, chlorosulfonated polyethylene, and chlorinated polyethylene.

13. The radiation resistant cable according to claim 10 , wherein the cross-linked polyolefin polymer comprises a polyethylene, wherein the polyethylene is one of an ultralow density polyethylene, a low density polyethylene, a medium density polyethylene, and a high density polyethylene.

14. The radiation resistant cable according to claim 9 , wherein the outer insulating layer is the outermost layer of the wires.

15. The radiation resistant cable according to claim 9 , wherein the inner insulating layer and the outer insulating layer form a double layered insulation structure.

16. The radiation resistant cable according to claim 9 , wherein the outer insulating layer consists essentially of the cross-linked polyolefin.