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Significant Accounting Policies (Tables)
 12 Months Ended
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