Television presenter Bláthnaid Ní Chofaigh is suing her employers RTÉ, the Irish Independent has learned.
The 'Nationwide' presenter has initiated personal injury proceedings against the national broadcaster, where she has worked in a variety of roles over the past three decades.
Ms Ní Chofaigh (49) declined to comment on the High Court action, but it is thought to relate to grievances spanning a considerable period of time.
RTÉ previously held an internal inquiry following complaints from the presenter that she had been sexually harassed by another staff member in the 1990s.
It is understood human resources issues raised by Ms Ní Chofaigh more recently have also been the subject of investigation.
The proceedings were initiated on Wednesday and Ms Ní Chofaigh is being represented by Daniel Spring and Company, a solicitors firm specialising in employment law and personal injury matters.
It is understood a personal injuries summons has yet to be received by RTÉ.
Available records indicate the matter has already been considered by the Injuries Board, which exercised its discretion not to arrange for the making of an assessment of damages.
Among other reasons, this can happen in cases where there are particularly complex issues, where the injuries sustained are wholly or in part psychological, or where aggravated or exemplary damages are sought.
Contacted by the Irish Independent, Ms Ní Chofaigh said: "I can't comment, sorry."
A spokesperson for RTÉ said it did not comment on legal matters.
In a radio interview several years ago, Ms Ní Chofaigh said she was sexually harassed by another staff member after she landed her first job at RTÉ at the age of 18. She revealed how this had a devastating effect on her life.
"Sexual harassment then, nobody understood it," she said in the interview on radio station Newstalk.
"I understood it as a feeling, what it made you feel, but I didn't have the words to articulate it. I didn't even understand that is what you called it.
"But somebody trying to undermine you by making you feel dirty and making sexual innuendos, that is the only definition I have of it because I have been there.
"I found myself in quite a serious situation with an internal inquiry instigated by myself because of the stuff I had gone through."
The person against whom she made the complaints is no longer alive.
RTÉ later confirmed an internal inquiry took place regarding incidents described by Ms Ní Chofaigh. However, it declined to reveal the outcome or confirm the identity of the alleged perpetrator.
It is understood other work-related issues have been raised by Ms Ní Chofaigh with RTÉ management in more recent times.
She joined 'Nationwide' earlier this year as a replacement for the departing Mary Kennedy. Ms Ní Chofaigh previously co-presented 'The Afternoon Show' between 2003 and 2009, but left due to health problems.
The mother-of-four was a judge in 'The All Ireland Talent Show' and took part in the reality television show 'Celebrity Bainisteoir'.
She has also worked as an actor, featuring in the Irish language comedy 'Crisis Eile'.