Reactor building comprising a vessel shaft anchored in a slab which is peripherally locked. This reactor building comprises a confinement enclosure (4) within which are positioned internal structures (14) constituted by an internal structure floor (16), a vessel shaft (18), a slab (22) being positioned between the general floor (8) and the internal structure floor (16), the vessel shaft (18) being anchored in the slab which is peripherally locked against the low part of the confinement enclosure skirt (12), a horizontal sliding joint (24) being positioned between slab (22) and internal structure floor (16). Application to the construction of the internal structures of a reactor building.
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