SIPTU will oppose any attempt to enforce compulsory redundancies on staff at RTE.
It was claimed late on Wednesday night that 200 jobs will be cut at the station, while top presenters such as Ryan Tubridy will be hit with pay cuts of 15%.
The national broadcaster will close its Limerick studio as part of a major financial restructuring to save €60 million over the next three years.
The potential move would see 11% of the company's workforce being let go.
Over 1,820 staff are currently employed at RTE - 250 of those work part-time.
It's believed senior management, including Director General Dee Forbes, will take a 10% pay cut.
The union has now responded, saying that it remains unclear how 200 voluntary redundancies will be achieved.
SIPTU Services Division Organiser, Karan O Loughlin, said: “SIPTU will oppose any attempt to enforce compulsory redundancies on staff in RTE.
"A plan for cutbacks at the national broadcaster, which was disgracefully leaked to the media yesterday, reveals plans to cut 200 jobs.
“The plan envisages that these job cuts will be achieved on a voluntary basis. However, there have already been several rounds of voluntary redundancies at the station, the last one of which was not fully subscribed.
"It is unclear to our members how 200 voluntary redundancies can be achieved.
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“These workers have been through several rounds of rationalisation at the station. They have taken the pain to assist in ensuring the survival of the crucial services which are provided by RTÉ and the thanks they have received is to be faced with an ultimatum concerning job cuts.”
She added: “What has made this situation even worse is the way this plan was exposed. Only senior management at RTÉ had access to this plan yet it was leaked to the media. This was extremely disrespectful to the loyal staff at the station.
“How this leak occurred is a matter that RTÉ Director General Dee Forbes must investigate and action must be taken against the culprit. If she fails to deal with this extreme breach of trust in an effective manner it raises questions concerning her attitude and fitness for the position of ultimate responsibility she holds in the national broadcaster.”
SIPTU and its affiliate unions, Equity Ireland and the Musicians Union of Ireland, represent approximately 1,200 RTÉ staff members.
