Reactor core support construction of pool type sodium-cooled fast reactor

The invention discloses a reactor core supporting structure of a pool-typed sodium-cooled fast reactor. The reactor core supporting structure of the invention comprises a large grid-plate header, a small grid-plate header and a reactor core support barrel, which results in that the number of opening of the large grid-plate header and the structural complexity of the large grid-plate header are both greatly reduced and the entire rigidity of the reactor core supporting structure is also improved. In addition, the small grid-plate header which is split can more easily achieve the distribution of the flow required by different reactor core components.