Reactor body structure suitable for nuclear steam supply system with double-layer sleeve structure

The utility model provides a reactor body structure suitable for a nuclear steam supply system with a double-layer sleeve structure. The device comprises a pressure vessel, an in-reactor component, acontrol rod driving mechanism and a double-layer sleeve structure, the in-reactor component at least comprises a hanging basket arranged in an inner cavity of the pressure vessel, the double-layer sleeve structure comprises an inner pipe and an outer pipe arranged outside the inner pipe in a sleeving mode, and the outer pipe is formed by an inlet connecting pipe of the pressure vessel. The nuclearreactor further comprises an inner tube supporting piece, the inner pipe supporting piece is arranged on the outer wall of the hanging basket, the inner pipe is detachably arranged on the inner pipesupporting piece and located in the outer pipe, the inner pipe is communicated with the interior of the hanging basket through the inner pipe supporting piece, and therefore cooling agents can flow into the inner pipe from the