PURPOSE: A nuclear reactor heat flow testing instrument for a sodium-cooling faster reactor is provided to prevent accidents by properly distributing the load. CONSTITUTION: The main container body of a nuclear reactor has a cylindrical shape. An upper-inner structure (120) covers the upper part of the main container body of the nuclear reactor. The upper-inner structure is placed inside the main container body of the nuclear reactor. A head supporting member (500) supports an upper head (200). The head supporting member is placed outside the main container body of the nuclear reactor.
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