SPDS, once again, the San Onofre experience

In 1980, SCE (Southern California Edison) bought a Safety Parameter Display System (SPDS) for its nuclear Units 2 and 3. The design was complex and took three years to install. At present, SCE once again is in the process of designing and procuring an SPDS for its nuclear Unit 1. In the six years since the first system, SCE has learned many lessons and these lessons have contributed to the conceptual design for the Unit 1 SPDS. The lessons learned cover the implementation procedures, the extensive operating experience, the organizational review, the Control Room Design Review (CRDR) integration, and the simple SPDS design. In 1986, SCE now has the advantage of more regulatory clarification, two years of operational experience with Units 2 and 3 and other nuclear industry experience. All this has contributed to a non-complex design that meets regulatory requirements, costs less, and has a short implementation schedule