ABSTRACT
This chapter focuses on the Small Modular Reactor (SMR) designs which form the basis for significant interactions between the designer and the US Nuclear Regulatory Commission, that is, the designs developed by mPower, NuScale, and Westinghouse. The designs are light water reactors (LWRs) and have many design features characteristic of the advanced LWRs. The Westinghouse SMR is designed to produce one-fifth of the power of the AP1000 plant, yet 25 Westinghouse SMR containment vessels will fit within one AP1000 containment vessel. The smaller SMR containment vessels will experience less wall stresses associated with the smaller diameter pressure vessel. The Westinghouse SMR is designed to operate using reactor coolant pumps although the RCS harbors a very tall riser component the core similar to the risers in both the mPower and NuScale designs. The water-filled pool is a steel-lined concrete structure with a 30-day supply of cooling water.
