NBC's "Meet The Press" has scheduled an exclusive joint interview Sunday with Anatoly B. Shcharansky and his wife Avital . . . It will be the first such TV interview granted by the couple and will be live from the NBC studios in Tel Aviv . . .

The Soviet human-rights activist, a leader in the campaign for the rights of Jews to emigrate from the Soviet Union, was freed by the Soviets Tuesday after eight years of imprisonment . . .

He immediately flew from West Berlin to Israel to be reunited with his wife, whom he hadn't seen in 12 years. She had emigrated from the Soviet Union the day after their wedding in 1974 . . .

CBS News Washington Bureau Chief Jack Smith yesterday announced that Joseph Peyronnin has been named deputy bureau chief . . .

He replaces Peter Kendall, who has been offered the job of Bonn bureau chief . . .

Peyronnin has been senior producer of the "Evening News" in Washington since September 1982 . . . one of those jobs at CBS News that signal you're on the fast track . . .

No replacement has been named for Peyronnin . . .

Peyronnin first joined CBS at WBBM, the network-owned station in Chicago in 1971, and came to Washington in May 1979 as an associate producer on "Evening News" . . .

The Public Broadcasting Service yesterday announced that Mr. Lake Wobegon himself, Garrison Keillor, will star in a live, two-hour special Saturday night, April 26, to mark the reopening (after a refurbishing) of the World Theater in St. Paul, Minn., Keillor's old stomping ground . . .

The show will be produced by American Public Radio. Keillor doesn't do much TV outside of the talk-show realm (WETA here filmed his appearance before an overflow audience at the Library of Congress last fall for use during its autumnal fund-raising campaign) . . .

Keillor is also set to perform for the PBS station managers at the L'Enfant Plaza Hotel here during their annual meeting, April 27-29 . . .

Another mystery cleared up! We finally contacted Judith DePaul, producer of "Mountbatten: The Last Viceroy," and yes, sharp-eyed viewer in Montgomery County, a Sealyham terrier did board the plane in England with Lord and Lady Mountbatten for their trip to India in Episode 1 . . . and it was a West Highland white terrier who debarked from the plane with her ladyship when it landed in India . . .

Although Dr. Airwaves had offered the easy explanation that the Sealyham had merely been reincarnated in flight . . . DePaul said it was more a matter of compassion . . .

"We just loved our little Sealyham," she said yesterday in London, "and we just thought it would be terribly unfair to take him to India where he'd have to remain in quarantine for six months. So we gave him a little brother. We used photographs to find a dog in India that matched the Sealyham exactly except for just a shade in the shape of his head" . . .

And how come the Sealyham popped up again in Episode 2? Because some of the scenes were filmed back in England . . .

DePaul, an American working out of London, is now producing a series on the life of Indira Gandhi . . . which is slated to air on Showtime cable here . . .

Daniel J. Werner, most recently a senior producer for "The MacNeil/Lehrer NewsHour" in Washington, has been promoted to associate executive producer . . . in charge of the day-to-day operations . . .

He'll be succeeded as senior producer in charge of foreign affairs and defense by producer Michael D. Mosettig . . . Moving Right Along

Jane Wyman has returned to work in her starring role as Angela Channing on CBS' "Falcon Crest" this week, fully recovered from abdominal surgery early in January . . .

Dixie Whatley has been dropped as New York correspondent for "Entertainment Tonight" . . .

Oh, goody! NBC has ordered three more installments of "Saturday Night's Main Event," the specials staged by the World Wrestling Federation used as once-a-month fillers for "Saturday Night Live" that feature Hulk Hogan and Rowdy Roddy Piper . . .

The Jan. 4 show had the highest rating in the late Saturday night time slot since April 1981 . . . which kind of tells you how far "SNL" has fallen . . .

Local news shows always gear up with special reports during a ratings sweeps month . . . With the February sweeps at the halfway point:

Channel 4 plans a series on anorexia and bulimia next week, anchored by Henry Tenenbaum, and a series by Joe Krebs featuring interviews with William Dean Christensen, a convicted Montgomery County murderer and a suspected serial killer . . .

In addition, Jack Cloherty is due to air an investigative series, the subject of which Four does not want to reveal at this time! . . .

So far this month, Four has done series on the gray market in automobiles, marriage "stings," the homeless and the "magic" of TV . . .

Channel 5 next week will air a series on terrorism. Currently, there are regular reports on "what's hot, what's not," and earlier this month, Ron Serro looked at the boom following the Metro expansion into the suburbs, and the station tested 600 area schoolchildren with dismaying results . . .

Channel 7 will have a series on various aspects of child custody, and new medical reporter Marilyn Mitzel will debut with a series on infertility and another on endometriosis, a common and painful disorder of the female reproductive system . . .

Earlier this month, Seven examined the changing roles of women and men, particularly in the light of worries over sexual diseases like AIDS and herpes . . . and this week Roberta Baskin's series on radon gas in the area has attracted a good deal of attention . . .

If we could just get Channel 9's attention, we'd tell you what they're doing, too . . .

NBC's "Today" show zips right along, averaging a 5.8 Nielsen rating and a 25 percent audience share for the week ending Feb. 7 . . .

ABC's "Good Morning America" did a 5.2/22 and "CBS Morning News" had a 3.1/13 . . .

Since the start of the year, "Today" averages a 5.6/24, followed by "GMA" at 5.0/21 and CBS at 3.0/13 . . .

ABC announced yesterday that Barbara Walters will interview President and Mrs. Reagan on Feb. 25-26 for a program to air Monday, March 24, as a lead-in to the Academy Awards on the network . . . And Finally

From our Roll Over Ira Gershwin file: NBC has released the lyrics for "Hey Did You Know?," the opening theme of its three-hour gala scheduled for sometime in May marking the 60th anniversary of the network. Here's the first chorus:

Hey did you know?

Hey did you know?

NBC first started 60 years ago . . .

Hey did you know?

Hey did you know?

You're invited to this very special show . . .

At NBC we're standing very tall

And it's clear we're here to thank you for it all . . .