Modular manufacture, delivery, and assembly of nuclear reactor building systems

A method of constructing a nuclear reactor, comprising:

• fabricating one or more sub-modules in a manufacturing facility, the one or more sub-modules comprising a skid and a shielding;
• assembling one or more sub-modules into one or more super modules using temporary connections at the manufacturing facility;
• disassembling the super modules;
• transporting the sub-modules to an installation site;
• assembling, at the installation site, two or more of the one or more sub-modules using permanent connections;
• installing concrete form ties between the two or more sub-modules;
• welding the two or more sub-modules together to create a super module;
• pouring concrete between the two or more sub-modules;
• and
• installing the super module in place.