 Chosen after a competition with 90 other companies to build the nation's first nuclear power plant in Shippingport, Pennsylvania, Stone & Webster was subsequently selected to design and supervise the construction of a large accelerator at the Brookhaven National Laboratory, design the neutron shield tank for the nuclear-powered merchant ship N.S.Savannah, and engineer and construct a prototype atomic energy power plant for the U.S. Army.The steady demand for electric power generation also meant an increase in construction contracts for more conventional power plants.