The former priest was sentenced to eight years last week for the historic rape and abuse of his three sisters.
He is now on the G3 landing of the Midlands Prison alongside some of the country’s most dangerous criminals including serial killer Mark Nash.
Brennan, 64, who pleaded guilty to six charges of rape and 18 indecent assaults on his sisters Paula Fay, Catherine Wrightstone and Yvonne Crist, who waived their right to anonymity, from dates in 1978 to 1985, is now working in the engraving shop.
A source said: “He keeps to himself and goes to the engraving shop for work. He keeps busy and out of trouble. They engrave plaques for staff awards and signs for doors within the jail.
“There was talk of him perhaps being moved to Arbour Hill Prison in Dublin but that’s unlikely as it’s bursting at the seams.”
Last week, Judge David Keane sentenced Brennan to a total of nine years in prison with one year suspended — with each of the individual sentences for each charge running concurrently.
During his sentencing he blamed his brother Bernard, who he claimed sexually assaulted him and encouraged him to abuse his sisters.
The court heard how he had told Ms Wrightstone “this is my job” and that “this is what brothers do” as he abused her.
Prosecuting counsel Fiona Murphy SC told the court how Ms Fay could feel Brennan’s erect penis against her leg and how he pinned her down and told her to “relax” as he sexually assaulted her.
The evidence of Ms Crist, who was present at the hearing via video link from her home in the US, was that Richard attempted to sexually assault her in or around June of 1979 and 1980, when her parents were in Wexford and when her other brother Bernard was no longer residing in the family home.
Bernard Brennan was jailed for four and a half years in June over four counts of indecent assault against Ms Crist at the age of 13 and seven counts of indecent assault against Ms Fay, which started when she was just seven years old.
BRAVE VICTIMS
Following his sentencing, his three sisters each delivered powerful victim impact statements.
Ms Wrightstone told her brother: “I want the court to understand that childhood sexual abuse and rape causes deep and lasting harm beyond the acts themselves.
“But most important, I want my voice to matter because for too long, it didn’t."