The Washington Redskins announced yesterday that season-ticket holders may bring their tickets for Sunday's game against the St. Louis Cardinals to the RFK Stadium box office today and Thursday to request a refund. The team announced that refunds will be paid in one check at the conclusion of the nine-day-old players strike, or at the end of the season.

Only a trickle of people appeared at the box office yesterday seeking refunds and ticket manager Sue Barton said, "I don't know what to expect" today and Thursday. She said the box office received as many phone calls yesterday from persons seeking tickets for Sunday's game as from those seeking refunds.

The Redskins announced that the returned tickets will be offered for public sale from 8 a.m. to 8 p.m. Friday. Even if the game is not sold out, it will be televised live on WUSA-TV-9, the team said in a statement. The Redskins have had sellout crowds for 21 years and have a waiting list for season tickets estimated at 20,000 persons.

Season-ticket priority will not be jeopardized for fans turning in their season tickets during a strike, according to league policy and Redskins Executive Vice President John Kent Cooke. "We have been sold out for 21 years, which is unparalleled in any sport," Cooke said. "We wouldn't do anything to hurt that."

The Redskins said ticket-holders for last Sunday's Patriots-Redskins game will get their money back at the end of the season because the game will not be made up.

For future home games, season-ticket holders may return their tickets to the RFK Stadium box office Monday through Thursday from 9-5 for that week's game as long as the strike continues.

Barton said no decision has been made whether season-ticket holders will have an option of applying the refund toward 1988 season tickets.

Cooke said he couldn't predict how many people would turn in tickets or how many fans will attend the game Sunday at RFK Stadium. "We expect a good turnout," he said.

The initial reaction in Washington was sharply in contrast to some other NFL cities. The New York Jets reported they had refunded money for 12,000 tickets as of yesterday and still had the mail orders to open. In Philadelphia the count was 8,000, with yesterday's refunds still to be tabulated.

Ticket refund policies varied around the league. Some teams offered refunds in person and by mail; others only in person; and one team, the Buffalo Bills, was only taking mail refunds.

At RFK Stadium, David Green, who says he has been a season-ticket holder since 1964, arrived shortly after 3 p.m. and was the only customer at the windows. "I thought the line would be a mile long," he said. "I was surprised I could come now and go right to the window."

A few minutes earlier, Dr. Ronald Bortman arrived at the box office with 16 tickets -- four of his own and 12 of his friends. "Last week's games didn't get played and I have no interest in watching scab teams {this} week," he said. "I can watch on TV and if I like what I see, I can go to future games."

In a related matter, the president of the union that represents the 600 vendors at RFK Stadium said his union will vote tonight on whether to honor the players' picket line.