The D.C. school board yesterday added Acting School Superintendent James T. Guines to a list of seven finalists it will consider as the new school superintendent. All of them have worked in urban school systems.

The board added Guines' name after a search committee comprised of D.C. residents and board members pared its list of 10 semifinalists to six. Under the terms Guines accepted when he was hired as the acting superintendent last December, he agreed not to apply for the job.

But Guines in recent months has expressed a strong interest in keeping the position and has maintained a high public profile during his nearly five months on the job. The board has said that it would consider him for the permanent appointment if it was not pleased with the other applicants selected from an original field of 76 seeking the $55,000-a-year post.

The other six finalists include two current D.C. school officials -- acting associate superintendents Reuben G. Pierce, who is responsible for curriculum development, and Andrew E. Jenkins, who is overseeing the development of an academic high school in the city.

The final list also includes two former D.C. school employes -- Floretta D. McKenzie, a former U.S. Education Department official and former deputy superintendent of Montgomery County schools who served as acting D.C. superintendent in the early 1970s, and Jerome Jones, currently the Providence, R.I., school superintendent and a former D.C. school teacher.

The other two finalists are Charles H. Durant, now an education consultant and formerly the superintendent in Providence and New Brunswick, N.J., and Robert L. LaFrankie, the Bethlehem, Pa., school superintendent.

In interviews yesterday, Jones and Durant both said they would continue with the school systemhs current competency-based curriculum, a program which takes into consideration a purpil's individual learning pace and stresses basic instruction in reading and math.

Jones and Durant also vowed to work toward good relations with the D.C. school board.