An internal interface structure of a nuclear thermal propulsion nuclear reactor including a reactor vessel and a reactor head, including a substantially cylindrical body having a top end, a bottom end, an inner surface, and an outer surface, and an annular flange extending radially- outwardly from the outer surface of the body, wherein the annular flange of the interface structure is mounted between an upper flange of the reactor vessel and a bottom flange of the reactor head.
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