English to Spanish Tech/Engineering Nuclear Eng/Sci

The present invention relates to nuclear reactor systems and refers more particularly to a nuclear reactor pressure vessel for use in large size water reactor systems, more particularly to such systems as represent size and capacity ratings not readily possible when employing reactor pressure vessel types as heretofore commonly used.
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The vessel structure (other than the cover) can be a unitary single-piece cast structure, or it can comprise pre-stressed interfitting plural vessel segments conjointly definitive of the outer vessel part structure. In either form, means are embodied in the outer vessel part for pre-stressing same and in at least any one or both of axial and circumferential directions. This means can include passages in the vessel outer part (and the cover too) which follow the axial and circumferential directions, there being elongated tendon members passing through such passages to beyond said passages, said terminations including tendon tensioning members thereon cooperative with outer vessel part surfaces adjacent passage termini for inducing compressive stress condition in said outer vessel part structure responsive to inducement of tensile stress in said tendons. The outer vessel part and cover passages can be fitted with tubular members in which said tendons are received.