Bill Kenney passed for 312 yards today as the Kansas City Chiefs routed the Seattle Seahawks, 34-7, and upset a playoff-bound team for the second week in a row.

Last month, Kansas City was humiliated, 45-0, when the Seahawks set an NFL record by returning four interceptions for touchdowns.

The Chiefs intercepted six passes today, one shy of the team record, in ending the Seahawks' eight-game winning streak.

"I didn't mention our last game (with Seattle) one time to this team in our preparation for this game," Kansas City Coach John Mackovic said.

He didn't have to.

"It was on our minds," said Kansas City linebacker Jerry Blanton of the 45-0 defeat. "We wanted to get them back but we didn't want to annihilate them . . . . But as we got rolling, that 45-0 started standing out even more."

Seattle (12-3) is home next week in the regular-season finale against Denver, which lost to the Chiefs last week. The Broncos (12-3) beat San Diego, 16-13, today.

The Chiefs (7-8), out of the playoffs for the 13th straight year, took charge of the Seahawks with a 17-point blitz in the second quarter.

"Everybody has pride. Nobody likes to be embarrassed," said Kenney. "If you asked the Seahawks, they would tell you we played some pretty good football today."

Nick Lowery's 29-yard field goal gave the Chiefs a 10-7 lead with 11:21 left in the second quarter. Fifty-seven seconds later, rookie linebacker Scott Radecic intercepted Dave Krieg and returned 19 yards for a touchdown.

Kenney, who completed 18 on 37 attempts, threw a 26-yard touchdown pass to Henry Marshall with 5:22 left in the half. Marshall had a career-high 166 yards on eight receptions.

Herman Heard's two-yard touchdown run gave the Chiefs a 7-0 lead. The Seahawks' touchdown came on a 49-yard flea-flicker play in the first period. David Hughes took a handoff and tossed the ball back to Krieg, who threw a scoring pass to Daryl Turner.

Krieg who had thrown for 700 yards and eight touchdowns his two previous games, was replaced by Jim Zorn in the fourth period after completing 17 of 38 for 263 yards and five interceptions. Jerry Blanton intercepted Zorn's first pass to set up Lowery's 22-yard field goal early in the fourth period.

"It was terrible . . . embarrassing," said Seattle Coach Chuck Knox. "We got outplayed and outcoached and just got whipped."