NBC's special premiere of "Day by Day" at 8:30 Monday night, right after "ALF," averaged an 18.6 national Nielsen rating and a 28 percent audience share ...

In an unusual premiere format designed to elicit big sampling audiences from strong lead-ins, "Day by Day" shows up again tomorrow night right after "The Cosby Show" before debuting in its regular time slot on Sunday at 8:30 on the network, right after "Family Ties" ...

Also on Monday night, the conclusion of "Bluegrass" on CBS averaged an 18.4/29 between 9 and 11, outdrawing "Police Academy II" on NBC, which did a 16.7/26, and "Perfect People" on ABC, which registered an imperfect 13.3/21 ...

In Washington, "Perfect People" on Seven actually won the two hours over the CBS and NBC entries ...

In its two nights, the miniseries "Bluegrass" averaged an 18.0/26 ...

Ted Turner, chairman of Turner Broadcasting System Inc., meets in New York today with representatives of the top 10 cable operators to present his "definitive plans" for the proposed Turner Network Television (TNT) project, which he hopes to launch in July ...

TNT is designed to be cable's "showcase" basic programming service, which, when established, would offer a 24-hour daily diet of original made-for-cable movies and miniseries and offer top-drawer sports events (Turner even envisages the day when TNT would outbid the major over-the-air networks for major viewing attractions like the World Series, the Kentucky Derby and the Academy Awards) ...

Turner is seeking a commitment from the MSOs (multiple system operators) to put TNT on their systems around the country, paying a monthly subscriber fee. Advertising revenues would, of course, follow as TNT expanded ...

If TNT gets underway, it is expected that Turner would rely heavily on his MGM library of 3,000 films at the onset ("Gone With the Wind," which Turner now owns, would reportedly kick off the network in July) ...

It is estimated that TNT would require about $40 million in operating capital over the first two years. Among the cable operators due to meet with Turner today are representatives of Tele-Communications Inc. (TCI), ATC (owned by Time Inc.), Warner Cable Communications Inc., United Cable Television Corp., Continental Cablevision Inc. and United Artists Communications Inc. ...

Together, the 10 MSOs meeting with Turner reach more than half of the 47 million cable homes in the United States. ...

At a black-tie dinner tomorrow night at the Waldorf-Astoria in New York, the International Radio & Television Society will honor CBS' "60 Minutes" with a coveted Gold Medal award ...

This is the first time a news broadcast has ever won a Gold in the 28 years IRTS has been honoring "outstanding contributions to the broadcasting industry." They almost always go to individuals. Recent winners include Allen H. Neuharth, Grant Tinker and Roone Arledge ...

On hand for the occasion will be "60 Minutes" creator and executive producer Don Hewitt, correspondents Mike Wallace, Morley Safer, Harry Reasoner, Diane Sawyer and Ed Bradley, and "60 Minutes" alum Dan Rather ...

A bill reauthorizing funding for public broadcasting was introduced yesterday by Sens. John Danforth (R-Mo.), Ernest Hollings (D-S.C.) and Daniel Inouye (D-Hawaii) ...

The Public Telecommunications Act of 1988 would authorize the Corporation for Public Broadcasting at $304 million for fiscal year 1991; $354 million for 1992 and $404 million for 1993 ...

In addition, the Public Telecommunications Facilities Program would receive $36 million in 1989, $39 million in 1990 and $42 million in 1991 ...

-----Rating ----------------------- Share ----- Network

1....26.4.. Olympics (Saturday).... 43......... ABC

2... 24.8.. The Cosby Show......... 37......... NBC

3... 23.5.. Olympics (Tuesday)..... 35......... ABC

4... 21.3.. A Different World...... 31......... NBC

.... 21.3.. Olympics (Monday)...... 31......... ABC

6... 20.5.. 60 Minutes............. 33......... CBS

7... 20.4.. Cheers................. 30......... NBC

8... 20.3.. Olympics (Thursday).... 30......... ABC

9... 19.7.. Murder, She Wrote...... 29......... CBS

10.. 19.0.. Matlock................ 28......... NBC

11.. 18.8.. Olympics (Wednesday)... 28......... ABC

.... 18.8.. Night Court............ 27......... NBC

13.. 18.2.. The Golden Girls...... .28......... NBC

.... 18.2.. ALF.................... 27......... NBC

15.. 17.6.. Bluegrass I............ 27......... CBS

16.. 17.4.. Perry Mason............ 26......... NBC

17.. 17.2.. Olympics (Sunday)...... 27......... ABC

18.. 16.7.. Family Ties............ 25......... NBC

19.. 16.6.. Dallas................. 27......... CBS

20.. 16.3.. Noble House (Wednesday) 26......... NBC

ABC, with its wall-to-wall coverage of the Winter Olympics, took the gold last week with a strong 20.5 rating and a 31 percent audience share. Season leader NBC mustered a respectable 15.6/24 while CBS, thanks to relatively strong performances by its regular series, hung in for a 13.5/21, just about its season-to-date average ...

Indeed, "Dallas' " performance on Friday for CBS helped push that night's Olympics to 30th place for the week ...

CBS won Sunday night, ABC took the other six ...

Otherwise, ABC's ratings overall were the best for any network since NBC had the Mets and Red Sox in the Series the last week of October 1986 ... and the busy researchers at ABC estimate 150 million saw all or part of the 16 days and nights of Winter Olympics coverage ...

Be that as it may, the Games cinched the February sweeps for ABC, ending an 11 consecutive sweeps sweep by NBC that began in May 1985 ...

You couldn't get near the Primetime Pantheon yesterday, what with all those ABC executives milling about (fortunately, the Pantheon Welcome Wagon had plenty of hot chocolate on hand) but over in the parking lot across Arledge Avenue we spotted petitioners from NBC's "Noble House," whose Monday and Tuesday episodes finished 22nd and in a tie for 28th, respectively, if not respectably. Over its four nights, the miniseries averaged a 16.2/24 ...

Those meanies at ABC research have pointed out that "Noble House" finished 62nd among all 77 series that have ever run three nights or more on a network. Of course, nobody asked Airwaves, but he thinks "Noble House" has to be the best miniseries ever to finish in 62nd place on the all-time list ...

In other developments, NBC's "Friday Night Surprise" surprised nobody by finishing 36th. I mean, "Dom DeLuise eats the surprise meal of a lifetime?" Gimme a break, NBC ...

Meanwhile, CBS programming overwhelmed last week's Final And If It Weren't For The Competition On ABC Undoubtedly Fatal Five ...

A Garfield rerun on CBS led off the FAIIWFTCOAUFF in 50th place, followed, in order, by "The Equalizer" and "High Mountain Rangers," tied for 51st; "Houston Knights"; and "West 57th," in 54th and last place for the week ending Feb. 28 ...

Those last three shows were up against ABC's ice skating finals Saturday night and together averaged an ethereal 9.4/12 for the evening. "West 57th," competing against Debi Thomas at 10 p.m., barely broke the ice with a 5.5/9 ...

Also in the News This will not come as a total surprise, but "ABC World News Tonight With Peter Jennings" finished on top of the network news race last week, too ...

ABC was first with an 11.7/21, followed by "CBS Evening News With Dan Rather" at 11.2/20 and "NBC Nightly News With Tom Brokaw" at 9.9/18 ... NBC, which hasn't won since mid-September, when the peoplemeters reported for work, has now finished last four weeks in a row and eight out of the last 10 weeks ... with two second-place finishes thrown in ...

They started production this week on the latest Mary Tyler Moore sitcom, which, with a 13-episode commitment, appears headed for the fall CBS schedule. In the still-untitled series, Moore will play a divorced mother of one who marries a widower (played by Edward J. Moore, no relation) with two children. His father (John Randolph) is an archconservative. Her mom (Eileen Heckart) is a "feisty liberal" ...

Oscar winner Ben Kingsley has signed to portray Nazi war criminal hunter Simon Wiesenthal in an upcoming HBO movie "Murderers Among Us: The Simon Wiesenthal Story," which will air on the cable network sometime next year ...