We use "defense-in-depth" design, which means there are redundant, diverse, and reliable safety systems to supply water to the reactor core. Every safety system has at least one independent back-up system and many have more than one. Plant safety systems are also run by multiple, redundant power sources. Certain equipment is designed to automatically shut down the plant if the need arises due to a condition outside of normal operations.
We also count on our people. Before they become Exelon employees, job applicants must pass thorough background checks. Exelon Nuclear then invests in training programs - both initial training and continuous programs for existing, experienced operations staff.
Much of our operations training is done in a full-scale electronic simulator of a control room. Initial training includes 12 weeks in the classroom, 25 weeks in the control room simulator and 16 weeks of on-the-job training. Once an employee is licensed by the NRC, that operator will continually train by spending one week in a control room simulator for every five weeks spent on shift in the control room. Even our most senior reactor operators receive training every six weeks, for a total of 8.5 weeks of training every year.
Learn more about the safety of Exelon's nuclear energy plants.