Patent Number: 063273233
Section: claims

1. A single containment building for a nuclear reactor, comprising: at least two reactor vessels each having an independent ability to generate thermal energy which is transferred away from said at least two reactor vessels by means of coolant contained within a coolant system, wherein said at least two reactor vessels have separate coolant systems, said thermal energy of said separate coolant systems transferred to a common header with at least one steam generator connected to said header such that there is independent control of each of said separate coolant systems and joint control of said header and said steam generator. 2. A single containment building as recited in claim 1, wherein there are a plurality of steam generators connected to said header. 3. A single containment building as recited in claim 2, wherein said containment building includes a spherical portion, a revised diameter of said spherical portion being less than 1.5 times an original diameter of a containment building having only one reactor vessel. 4. A single containment building as recited in claim 3, wherein said revised diameter is between 1.2 and 1.3 times that of said original diameter.