Patent ID: 7684535

Claim:
A reactor containment vessel comprising: a primary reactor containment vessel including a dry well which stores a reactor pressure vessel, a wet well which stores a pressure suppression pool, and a vent pipe connecting said dry well and said pressure suppression pool; a secondary reactor containment vessel which surrounds said primary reactor containment vessel; an equipment room disposed in said primary reactor containment vessel at a position below said pressure suppression pool; and a base mat which supports both of said primary reactor containment vessel and said secondary reactor containment vessel; wherein said primary reactor containment vessel has a ceiling which includes concrete, an outer cylindrical wall which includes concrete and which extends to said base mat from said ceiling of said primary reactor containment vessel and which faces said dry well, said pressure suppression pool and said equipment room, respectively, an inner cylindrical wall which includes concrete and which faces said pressure suppression pool and said equipment room, respectively, and a pressure suppression pool floor which includes concrete and which partitions said pressure suppression pool and said equipment room; and wherein an outside portion of said outer cylindrical wall, an inside portion of said outer cylindrical wall which faces said equipment room, an inside portion of said inner cylindrical wall which faces said equipment room, an outside portion of said ceiling, and a lower portion of said pressure suppression pool floor which faces said equipment room are formed of a steel plate reinforced concrete including a steel plate and a connect member fixing said steel plate to said concrete, respectively; and wherein an inner side surface portion of said outer cylindrical wall which faces said dry well and said wet well is formed of said concrete without said steel plate which forms a part of said steel plate reinforced concrete at said outer side surface portion thereof.