The D.C. school board last night approved a building-use agreement to allow an activist group to operate the Nichols Avenue School in Southeast Washington as a shelter for the homeless.

The Community for Creative Non-Violence, a group that says it works to find shelters for the homeless, will be able to open the closed school on Martin Luther King Jr. Avenue as a shelter between 8 p.m. and 8 a.m. beginning tonight until March 23, the board decided.

Although operation of the building will cost the group $1,783.03 a week, one CCNV member expressed pleasure at the decision.

"We feel absolutely terrific; there has never been a shelter in Southeast and there is really a need there," said Carol Fennelly.

The board also officially accepted a $477,300 Ford Foundation grant that D.C. school Superintendent Floretta D. McKenzie said would allow the opening of computer labs in four schools, and provide for the training of high school teachers in the use of computers in remedial instruction.

The 11-member board unanimously approved a resolution to ask again for $336.4 million from the city for the fiscal 1984 school budget. Mayor Marion Barry has recommended that the school system receive approximately $18 million less.