Patent ID: 6504888
Filing Date: 2003-01-07
Classification: G21C,Y02E

Abstract:
A reactor pressure vessel for a nuclear reactor, said pressure vessel comprising:a bottom head petal attached to a bottom head, said bottom head petal comprising a reactor shroud support flange, a reactor side wall flange and a reactor internal pump deck extending between said shroud support flange and said side wall flange, said pump deck having at least one opening extending therethrough; at least one reactor internal pump, each said pump extending through a pump deck opening, said pump comprising an impeller and a diffuser, said diffuser comprising a housing, said housing comprising: (a) an outer wall and a plurality of vanes defining a plurality of flow passages extending longitudinally through said housing; (b) at least two seal rings, each said seal ring spaced apart from an adjacent seal ring and extending circumferentially around an outer surface of said housing outer wall; and (c) at least one lateral bore extending through said outer wall into a diffuser housing longitudinal flow passage, each said lateral bore located in an area between two seal rings; and at least one pressure tap bore extending from an outer surface of said bottom head petal through said pump deck to an inner surface of said at least one pump deck opening, each said pressure tap bore aligned with said area containing a corresponding lateral bore.