Emile Charlap (music contractor) and Mike Small attended a film music discussion a few years ago and Emile spoke of Small writing a score to the China Syndrome that was never used. Later on when I was working to get the Jaws 4 promo out I mentioned ever having his CS score released and he kind of demured about ever releasing it. But it was done.
Incidentally Emile was the same contractor for Interview with a Vampire...twice. Apparently the producers replaced Fenton midway through his scoring, but didn't tell him, so essentially he was scheduling Fenton in the morning for a score everyone, except Fenton, knew wasn't going to be used, and then Goldenthal in the afternoon/evenings. Not only was it colossally unprofessional on the producer's end, it was also a huge waste of money since it was double union sessions.
Fenton came to NY as part of some sort of "exchange program" where English composers came to NYC as so many US composers used English orchestras. Have no idea if they still try to stick to that or not.