February 10, 1982

A Philippine athlete who vanished Dec. 29 after secretly marrying a daughter of President Ferdinand E. Marcos apologized on radio and television today because his family had accused the Marcos family of complicity in his disappearance. Tommy Manotoc, a 32-year-old amateur golfer and professional basketball coach, made the apology by twice reading a letter to the President at a news conference arranged by Defense Minister Juan Ponce Enrile. The news conference was held hours after the Government announced that he was rescued from ''armed terrorists'' Monday in a mountainous area 55 miles east of Manila ''usually dominated'' by the Maoist insurgent group known as the New People's Army. ''I understand,'' Mr. Manotoc's letter said, ''that many names have been maligned and that your honor has been questioned. This I would want to rectify for the sake of the country and the Filipino people which you lead.''

Israel has reportedly been considering plans for a large-scale invasion of southern Lebanon to clear out the Palestinian military reinforcements that have been brought into the region since the cease-fire there last July. The Government has also reportedly told the United States that an attack would be launched should there be further terrorism by the Palestine Liberation Organization. Troops and weapons of the Israeli Army are said to be deployed in the north to carry out such an operation, if necessary, according to foreign diplomats here. Both Israelis and foreigners familiar with the high-level deliberations say no final decision has been made to go ahead with an invasion. A proposal to do so last week by Defense Minister Ariel Sharon, after a five-man terrorist squad crossed into Israel from Jordan, was rejected by Prime Minister Menachem Begin because of the unfavorable repercussions it would have on relations with Washington, officials say.

No one worries about sticker shock in George Principe's wood-paneled Cadillac showroom. While other dealers were fretting last year about the recession and slumping sales and buyers' preference for foreign cars, he and his six salesmen sold 996 new Cadillacs - more than ever before. But the record sales have not completely protected Mr. Principe from the problems that have troubled Cadillac's poorer cousins within the General Motors family. The dealership's profits were held down by rising operating costs, including wage increases that followed a weeklong mechanics' strike last year.

The Koch administration, which discontinued payroll deductions for United Way of Tri-State more than a year ago because of reservations about the way they were conducted, announced yesterday that it had devised a new plan. The Mayor's office said the new procedure had been designed to remedy several problems he had with the old plan, which was administered by United Way. The city let that system lapse in late 1980. At the time, Mr. Koch questioned United Way's methods of soliciting money from city workers and noted that, through an apparent administrative error, some weekly deductions had been continued longer than they should have been.

The State Public Service Commission agreed today to allow the completion of the Nine Mile Point 2 nuclear power plant on the shore of Lake Ontario, despite overruns that have caused an increase of more than tenfold in cost projections in eight years. At the same time, the chairman of the commission said it had reached a consensus on setting up a system of incentives and penalties that would force the stockholders of the five utilities building the plant to bear some of the cost of future overruns. The Commission staff estimated that the plant would cost $4.9 billion when completed in 1987, making it the most expensive nuclear power plant ever in terms of the construction cost per kilowatt of power. In 1974, when construction began, the cost was projected at $381.7 million.