The former regional head of the Catholic order, Brother Alexis Turton, confirmed he met an alleged victim at Canberra Airport in September 1993, prompting Brother Kostka Chute's removal at the end of the school year.

However, it is understood that neither the school nor Marist Brothers made efforts to identify any other potential victims, and they did not refer the matter to police.

"Basically [the alleged victim] made a complaint about Brother Kostka. I spoke to Brother Kostka and after a discussion we decided that the best course of action would be for him to leave Canberra," Brother Alexis told The Canberra Times. "Basically, after the discussion [with Kostka] I asked him to leave."

Students and parents were not told at the time why Kostka had been removed from the school. Instead, the 1994 college year book suggested Kostka had accepted an invitation to transfer to Sydney, and he was praised for his invaluable contribution to the school during his 18 years of teaching.

"During the holidays last Christmas, in a belated transfer which is usual enough in religious congregations, Brother [Kostka] accepted the invitation to bring to a close his long ministry in Canberra and moved to Sydney," the entry said.

"The lateness of the transfer meant we could not pay tribute to him in the 1993 Blue and Blue [year book], so here it is one year later, but no less genuine or sincere because of that."

On January 17 this year, after more than a decade of living at a Marist Brothers-run retirement farm in the NSW Southern Highlands, Kostka surrendered himself to ACT police to face 18 counts of molesting children in the 1980s, relating to six boys.

The 75-year-old retired brother, born John William Chute, pleaded guilty in the ACT Magistrates court last Thursday to 11 counts of committing acts of indecency on students aged 13 and 14 between 1986 and 1987. The remaining seven counts were dropped because they pre-dated 1985 when a statute of limitations of one year applied to the charge. He is awaiting sentence and remains on bail.

The alleged victim who met Brother Alexis at the airport, who wished to remain anonymous, told The Canberra Times he had approached the school's headmaster more than a decade after the assault because of concerns Kostka was allegedly grooming other children. He alleges the headmaster at the time, Brother Christopher Wade, arranged the meeting with Brother Alexis. However, Brother Christopher, who now works part-time at a school in Sydney, denied this week ever meeting with any alleged victims of Kostka, and said he only became aware of any allegation against him when he was charged in January.

Brother Alexis, now professional standards officer for the Marist Brothers NSW, Queensland and ACT province, also confirmed Kostka was not removed from the school until three months after he met the alleged victim. He said an "assessment" concluded "no-one was in any danger" if Kostka remained at the school until the end of the term. Another alleged victim said he had reported an allegation of sexual abuse to the school in December 1993, days before Kostka was removed. On that occasion, the school again allegedly arranged for Brother Alexis to meet the boy's parents in Canberra. He assured them Kostka would never work with children again. Brother Alexis has denied any recollection of this meeting.

The admissions come on the back of allegations contained in civil and criminal court documents that various headmasters and teachers knew of allegations of sexual abuse against Kostka as early as 1979, and against other brothers and teachers at the school as early as 1970, but failed to act.

Three civil claims already lodged with the ACT Supreme Court seek compensation from Marist Brothers for alleged victims of Kostka for breach of the school's duty of care.