A search for clues in the latest shutdown of the Hope Creek nuclear reactor. A radioactive steam leak caused the shutdown Sunday night. The plant's operator says the slow leak began in February. That was just weeks after the trouble-plagued plant had been shut for three-and-a-half months because of a bigger leak. P-S-E-and-G Nuclear said yesterday the problem could be diagnosed and fixed within the next few weeks. The company also said no radioactivity was released outside the plant and no workers were harmed in either of the steam leaks. The federal Nuclear Regulatory Commission put Hope Creek and two...