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Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2020
Significant Accounting Policies [Abstract] |
Property, plant and equipment, estimated useful lives | The estimated useful lives of the Company’s property, plant and equipment are as follows:
|  | Useful lives (years)
Buildings |  | 8 ~ 40
Structures |  | 5 ~ 50
Machinery |  | 2 ~ 32
Vehicles |  | 3 ~ 8
Loaded heavy water |  | 30
Asset retirement costs |  | 18, 30, 40, 60
Right-of-use assets |  | 1 ~ 65
Ships |  | 9
Others |  | 4 ~ 15
Intangible assets, estimated useful lives | The estimated useful lives and amortization methods of the Company’s intangible assets are as follows:
|  | Useful lives (years) |  | Amortization methods
Usage rights for donated assets |  | 10 ~ 30 |  | Straight line
Software |  | 4, 5 |  | Straight line
Industrial rights |  | 5 ~ 10 |  | Straight line
Development expenditures |  | 5 |  | Straight line
Leasehold rights |  | 8 ~ 10 |  | Straight line
Others |  | 3 ~ 50 or indefinite |  | Straight line
Mining rights |  | — |  | Unit of production

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