D.C. police officer was charged with assault with a dangerous weapon yesterday after she allegedly shot and seriously wounded her boyfriend, who is also a D.C. police officer, in what police said was a domestic argument.

It was the second incident in a week in which two police officers who were dating or living together quarreled and a police department service revolver was fired. During an argument Monday between a man and a woman police officer, the woman's gun was fired but neither officer was injured.

"This happens rather infrequently," said Capt. William White III, a police spokesman.

About 2 a.m. yesterday, Kenneth L. Kendall, 33, a police officer for six years assigned to the 7th Police District, was shot once in the chest. Kendall was admitted to D.C. General Hospital in serious condition. He was in intensive care yesterday after surgery, and his condition was upgraded to stable.

Yvette Chapman, 28, a three-year officer assigned to the 5th District, was charged with assault with a dangerous weapon, and both officers were placed on administrative leave pending a police department investigation.

"Police officers are dating more because there are more women on the force," said Gary Hankins, chairman of the Fraternal Order of Police labor committee.

"From time to time, being human beings, they get into domestic disputes," he said.

Ruth B. Waller, an officer with the 5th District for three years, and Lewis D. Rienzi, a 6th District officer for 13 years, got into an argument in the kitchen of Waller's Southeast home about 6:30 a.m. Monday.

"Somehow Officer Waller's gun was involved," White said. "The two of them struggled over the gun, and it accidentally discharged, striking the kitchen wall. No one was injured." Waller and Rienzi were placed on administrative leave pending a department investigation.

Police union leaders criticized the way the department handled a similar police shooting seven years ago.

D.C. Police Capt. Charles R. Bacon was charged with assault with intent to kill in April 1981, for allegedly firing four shots at a female D.C. police detective during a domestic dispute in Oxon Hill.

Criminal charges were dropped, and Bacon was allowed to return to work. Police union leaders had said Bacon was given special treatment.