NBC scored another convincing primetime ratings victory among young adults last week, while CBS eked ahead in total viewers.

According to Nielsen estimates for the Dec. 9-15 frame, the Peacock net won for the 10th time in 11 weeks — topping second-place CBS and Fox in adults 18-49 by 27% (4.7 to 3.7). This matched the net’s largest bulge of the season, set one week earlier.

NBC also won in the adult breakdowns of 25-54 and 18-34.

In overall audience, CBS drew about 30,000 more viewers during an average minute of primetime than NBC, for its eighth triumph this fall.

Roughly a third of the way through the season, NBC enjoys a comfortable 20% advantage over second-place CBS in adults 18-49, while the Eye net maintains a 3% lead over the Peacock in total viewers. NBC also leads in adults 25-54 (by 10% over CBS) and adults 18-34 (by 19% over Fox).

In their respective target demos, the WB is up nicely year-to-year and ABC is flat, while NBC and CBS are both down slightly. Fox (down 12%) and UPN (down 18%) are the nets struggling the most this season.

NBC was led by its strong regular lineup alongside specs like Tuesday’s Dixie Chicks concert special (3.8/11 in adults 18-49) and Sunday’s telecast of theatrical “National Lampoon’s Christmas Vacation” (5.2/12).

Monday also was very strong, with “Fear Factor” (6.1/16 in adults 18-49), “Third Watch” (5.3/12) and “Crossing Jordan” (4.5/11) all matching or setting season highs.

For CBS, Thursday drama “CSI” again towered over all primetime programs in total viewers (25.89 million) and was No. 3 for the week in adults 18-49 (9.4/23). And lead-out “Without a Trace” (5.3/13) retained a best-yet 56% of that demo lead-in despite being overwhelmed by NBC’s “ER” (11.4/29).

Eye’s “Rudolph the Red-Nosed Reindeer” shined brightly, easily winning its Friday hour and ranking as the week’s top-rated show — broadcast or cable — in kids 2-11 (8.7/25).

Fox ranked second in both adults 18-49 (tied with CBS) and 18-34, led by “The Simpsons,” which was Sunday’s highest-rated program in adults 18-49 (7.2/18) and total viewers (15.47m). It also was boosted by a winning perf from “24” (4.8/12 in adults 18-49) and the “Billboard Music Awards” (4.3/11), which gave the net its best Monday of the season.

ABC had several strong hours on the sked, including its Tuesday and Wednesday comedies and Wednesday spec “Extreme Makeover” (5.8/14 in adults 18-49), but it was weighed down by weak-performing dramas “MDs” and “Dinotopia,” both of which have since been canceled.

Elsewhere in the week:

Not-so-bloody Sunday: Only NBC was able to fully capitalize on the first Sunday of the season without competition from HBO’s “The Sopranos,” as “Christmas Vacation” delivered the second-best 18-49 score for any movie on any net this season (5.2/12). The needle didn’t budge much for ABC’s “Alias” (4.2/10), and CBS struggled with original pic “The Man Who Saved Christmas” (2.5/6 in adults 18-49, 10.66 million viewers overall).

Fox’s “Malcolm in the Middle” (5.1/12 in 18-49) was up vs. its recent 9 p.m. average, but that was largely due to a stronger showing at 8:30 from “King of the Hill” (6.2/15). “King,” which led its half-hour in every key demo, also drew its largest overall aud (13.41 million) since May 1998.

Wednesday warrior: NBC returned to its winning Wednesday ways, led by the strongest score of the season for “Law & Order” (7.6/20 in A18-49). Compared with the same night of originals a year ago, “Law” was up 4% in 18-49, while lead-in “West Wing” (5.1/12) was down 26% and leadoff hitter “Ed” (4.0/11) was flat.

Revving up: New Fox action drama “Fastlane” isn’t doing great overall numbers, but it did see its best scores since September (7.65m, 3.5/9 in A18-49). It led the Wednesday-at-9 hour in men 18-34 (4.4/12) and male teens (4.8/14).

Tuesday tussle: The 9:30 rookie comedy battle between ABC’s “Life With Bonnie” and NBC’s “Hidden Hills” is shaping up as a competitive one, with the shows tying in adults 18-49 with a 4.2/10 — this despite an edge at 9 for NBC’s “Frasier” (5.2/13) over ABC’s “Bonnie” (4.4/11).

ABC’s “According to Jim” did very well on the night, ranking as the top show in adults 18-49 (6.1/17) and total viewers (14.62m).

Couples chuckles: “Yes, Dear” continues to perform well for CBS. Not only has it consistently built on its “King of Queens” lead-in among adults 18-49, but in its first Sunday try, a repeat of the comedy built on an original “Becker” by 22% in the demo (2.8/7 vs. 2.3/6).

Christmas cheer: “Rudolph” gave CBS its best showing among adults 18-49 in Friday’s leadoff hour (4.2/14) since a seg of “Big Brother” in September 2000. And this came even as the WB was enjoying success with “How the Grinch Stole Christmas” (2.2/8) and the new “Scooby-Doo Christmas” (1.6/5), both of which set season-high slot marks in key demos.

At 9, though, two half-hours of new CBS holiday entry “Robbie the Reindeer” averaged a 2.7/8 in the 18-49 demo, falling slightly behind ABC’s second airing this month of “A Charlie Brown Christmas” (2.8/9).

Nearing finish line: There was no build for the penultimate episodes of CBS reality skeins “Amazing Race 3” and “Survivor: Thailand,” both of which wrap this week. This edition of “Survivor,” though, is pacing ahead of last fall’s “Survivor: Africa” at this point — up 5% in adults 18-49 and 6% in total viewers.

Also one week from its finale, NBC’s “Providence” hit a season low (2.3/8 in A18-49), clearly hurt by CBS’ “Rudolph.”