Fiona Doyle has welcomed a decision by the DPP to appeal the leniency of the sentence handed down to her father for raping and indecently assaulting her.

Patrick O'Brien was given a 12-year sentence with nine years suspended and has chosen not to appeal it.

He was originally granted bail pending any potential appeal.

However, Mr Justice Paul Carney reversed that decision within five days and O'Brien is currently in prison.

The DPP this afternoon lodged appeal papers to the office of the Court of Criminal Appeal, saying the sentence was unduly lenient.

Speaking on RTÉ's Today with Pat Kenny radio show, Ms Doyle said gardaí informed her of the DPP's decision to appeal the leniency of her father's sentence yesterday.

"The time was up yesterday, the 21 days for the appeal, and I had a meeting with the guards yesterday and they told me that my father hadn't appealed, but that they were going to, which was a nice surprise and a shock," Ms Doyle said.