Several of the older plants and some of the not so older plants have been shutdown, dismantled, and their license terminated. That includes Yankee Rowe, Hombolt Bay, Maine Yankee, Trojan, San Onofre 1, Connecticut Yankee, Fermi 1, LaCrosse, Shippingport, Ft. St. Vrain, Zion 1 & 2, Rancho Seco 1 & 2, Saxton, and maybe some others that have been long since forgotten. The plant is dismembered and the materials are sent off to be buried, reprocessed, incinerated, or surveyed and released.
The spent fuel is placed in dry fuel storage until a high level waste depository is built or until eternity, which ever comes first.
As for those plants that are still operating, well they a re still operating. They were initially licensed for 40 years, but the owners are requesting extension for an additional 20 years.
The NRC website is a good place to find info on operating plants. You can google the plants name (including the dead ones) and find more info and maybe some E-mail addresses or phone numbers for contacts.